Library

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Surgery today 26 (1996), S. 446-448 
    ISSN: 1436-2813
    Keywords: Morgagni hernia ; diaphragmatic hernia ; diagnosis ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We herein present a patient with Morgagni hernia which was diagnosed by magnetic resonance imaging (MRI). The patient had a progressively enlarging mass in the right cardiophrenic angle on chest roentgenogram. On computed tomography (CT) scans, the mass was revealed to have fat density and therefore was suspected to be either a lipoma or liposarcoma. MRI clearly demonstrated that the mass shadow was composed of omental fat herniating into the right thorax through the diaphragmatic hiatus. MRI is thus considered to be a useful noninvasive modality for the evaluation of lower anterior mediastinal masses demonstrating fat density on CT.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1435-5922
    Keywords: MRI ; short inversion time inversion recovery sequence ; STIR ; colorectal cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To examine the usefulness of magnetic resonance imaging (MRI) in the preoperative determination of cancerous invasion, we examined 39 patients with advanced colorectal cancer with 0.5T MRI. We employed short inversion time inversion recovery (STIR) sequences, in addition to ordinary spin echo sequences for T1-and T2-weighted images. Preoperatively, the estimated depth of tumor invasion was classified into three grades according to MRI findings, and confirmed on the basis of surgical and histopathologic results. The depth of tumor invasion estimated preoperatively using STIR sequences corresponded well with the surgical and histopathologic results in 85% of the cases. In contrast, assessments based on T1-weighted images corresponded well in only 62% of the cases and T2-weighted images corresponded well in only 64%.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1435-5922
    Keywords: diffuse cavernous hemangioma ; rectum ; sphincter-saving surgery ; MRI ; endorectal coil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We describe the clinical features, diagnostic procedures, and treatment of two patients with diffuse cavernous hemangioma of the rectum. Sphincter-saving operations were performed in both patients, with satisfactory results. Magnetic resonance imaging (MRI) with an endorectal surface coil, as well as a conventional body coil, was used to determine the extent of the hemangiomas. We recommend sphincter-saving surgery for the treatment of this benign disease that can cause life-threatening hemorrhage. MRI with an endorectal coil achieves higher-resolution images than conventional MRI.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 18 (1996), S. 201-207 
    ISSN: 1279-8517
    Keywords: Anatomy ; MRI ; Medulla oblongata ; Veins ; Contrast medium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé L'imagerie par résonance magnétique (IRM) est progressivement devenue la principale méthode d'imagerie des lésions infra-tentorielles. Afin d'étudier l'aspects en IRM des vv. bulbaires, nous avons réalisé une étude prospective de 40 patients normaux explorés en coupes axiales et frontales en IRM après injection intraveineuse de Gadolinium. Les vv. de la medulla oblongata ont été inconstamment visibles: antérieures (16 %), postérieures (3 %) latérales (8 %); en revanche la v. du récessus latéral du IVème ventricule l'est constamment et dans les trois plans; le sinus pétreux inférieur est visible en IRM dans 82% des cas. Leurs critères d'identification sont discutés puisqu'ils constituent l'origine des principaux collecteurs veineux du tronc cérébral. Leurs rapports avec les structures de la fosse postérieure ont été soulignés et discutés.
    Notes: Summary Magnetic resonance imaging (MRI) has progressively become the major or even the only imaging procedure for displaying the vascular relationships of the brainstem in the context of infra-tentorial lesions. In order to assess the MR sectional anatomy of the bulbar vv. 40 normal patients were examined in the MR axial, frontal and sagittal planes after gadolinium IV injection. The bulbar venous networks were inconstantly visualised: anterior vv. (16%). posterior (3%), lateral (8%). The vein of the lateral recess of the fourth ventricle was constant in the three planes; the inferior petrosal sinus could be seen in 82% of cases. Their relation with the posterior fossa structures are emphasised and discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 18 (1996), S. 221-225 
    ISSN: 1279-8517
    Keywords: Supraspinatus ; Anatomy ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Dix préparations anatomiques et 15 IRM (Imagerie par Résonance Magnétique) sur sujets sains ont été utilisées pour préciser les insertions latérales du m. supra-épineux et les limites de sa loge d'insertion. Cinq préparations congelées et coupées dans le plan correspondant à celui de l'incidence sagittaleoblique de l'IRM, ont permis de calculer le rapport quantitatif entre les contours osseux (O) et musculaires (M) de la fosse supra-épineuse: ce rapport est maximal (O/M=2,4) pour une coupe passant dans le plan comprenant le processus coracoïde en avant et l'épine de la scapula en arrière (coupe en Y). Cinq dissections sur sujets non embaumés ont montré que l'insertion postéro-latérale du m. supra-épineux s'étendait latéralement au delà des insertions classiquement décrites. Cette observation a été confirmée par 15 IRM sur sujets témoins qui ont montré que le m. supra-épineux présentaient encore des insertions au niveau de la coupe IRM “en Y” dans 53 % des cas. La connaissance de ces deux paramètres permet de proposer une technique d'évaluation quantitative de l'atrophie du m. supra-épineux à l'aide de l'IRM.
    Notes: Summary Ten anatomical preparations and 15 MRI scans (Magnetic Resonance Imaging) performed on healthy subjects were used to define accurately the lateral attachments and anatomical boundaries of the supraspinatus m. Using 5 frozen specimens sectioned in the plane corresponding to the sagittal oblique MRI plane, it was possible to calculate quantitatively the ratio between the bony contours (O) and muscles (M) of the supraspinous fossa. This ratio was maximal (O/M=2.4) for the section passing through the plane which included the coracoid process anteriorly and the spine of the scapula posteriorly (“Y” section). Five dissections on unembalmed subjects demonstrated that the postero-lateral origin of supraspinatus m. extended further laterally than classically described. This observation was confirmed in the 15 MRI subjects which showed that the supraspinatus m. may arise as far laterally as the “Y” section on MRI in 53% of cases. A quantitative evaluation of atrophy of the supraspinatus m. using MRI is possible with a knowledge of these two parameters.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Neurosurgical review 19 (1996), S. 13-16 
    ISSN: 1437-2320
    Keywords: MRI ; Pleomorphic xanthoastrocytoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The authors describe 3 cases of cerebral pleomorphic xanthoastrocytoma, one of which has an unusual neuroradiological appearance, and review the clinical and prognostic features of the 96 cases reported in the literature. Pleomorphic xanthoastrocytoma is a neuroectodermal tumor that affects young patients, in a superficial or supratentorial site, most frequently at the temporal level. It is difficult to formulate a differential diagnosis with other neuroectodermal tumors or with meningioma on the basis et neuroradiological appearance, as demonstrated by one of the cases reported here. The prognosis of this tumor is very good, regardless of the type of treatment performed, although both relapse and, more rarely, malignant tumor evolution are possible.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1433-044X
    Keywords: Schlüsselwörter Osteochondrosis dissecans ; Stabilitätsbeurteilung ; Konventionelle Radiologie ; MRT ; Key words Osteochondritis dissecans ; Fragment stability ; Radiography ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: A prospective study was performed on 72 patients with osteochondritis dissecans (OD) of the knee and ankle to compare plane radiography, MRI and arthroscopy before therapeutic procedures. Special interest was placed on the assessment of fragment stability with radiological methods for staging related therapy. OD was localized in 46 cases on the femoral condyle and in 26 cases on the talus. Radiological methods were performed simultaneously and shortly before definite arthroscopical therapy. Using conventional radiography, OD of the condyles was staged according to the classification of Rodegerdts and Gleissner and OD of the talus suggested by Berndt and Harty. MRI staging was performed by morphology of the interface of the OD. Arthroscopical staging based on the classification of Guhl. There was an excellent correlation between the stages in MRI and arthroscopy, showing correct prediction of stable and unstable fragments in 92%. In contrast, fragment stability could not be efficiently assessed by conventional radiology because fragments could be stably fixed in cases of bony separation. MRI is indicated before performance of staging-related therapy of OD to select patients with stable fragments for conservative therapy and those with unstable OD for surgical therapy.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric surgery international 11 (1996), S. 290-295 
    ISSN: 1437-9813
    Keywords: Vascular malformation ; Hemangioma ; MRI ; Embolization ; Sclerotherapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The vast majority of cutaneous vascular anomalies in infants and children are either malformations or hemangiomas. Vascular malformations are subgrouped, based on channel morphology and rheology: slow-flow (capillary, lymphatic, venous, or combined-complex types) and fast-flow malformations (ectasia, aneurysm, fistula, or arteriovenous anomalies). Noninvasive radiologic techniques, especially ultrasonography with Doppler flow studies and magnetic resonance imaging, serve to document the extent and flow characteristics. Management depends on the type of malformation: laser for capillary malformations; surgical excision for lymphatic malformations; compression, sclerotherapy, and resection for venous malformations; and embolization and/or surgical resection for arteriovenous fistulae/malformations. Hemangiomas are the most common tumors of infancy. The life cycle is divided into three phases: proliferating, involuting, and involuted. Most hemangiomas do not require treatment, although drug therapy is indicated for endangering or life-threatening hemangiomas. Corticosteroids (either systemic or local) and alpha-2a interferon are currently the most effective agents. Surgical resection of problematic hemangiomas can be undertaken during infancy, the preschool years, or childhood.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1432-2161
    Keywords: Key words Amyloidosis ; Amyloid arthropathy ; Dialysis-related amyloidosis ; MRI ; Shoulder ; Hip
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. The purpose of this study was to evaluate the usefulness of MRI in identifying abnormalities of the periarticular structures in patients with symptoms of dialysis-related amyloid arthropathy. Design and patients. MR images of shoulders and hips in 5 dialysis patients with symptoms of amyloid arthropathy were compared to images of shoulders and hips in 4 asymptomatic dialysis patients, shoulders in 9 nondialysis patients, and hips in 12 nondialysis patients. These were evaluated for the presence of focal periarticular osseous lesions, tendinous and capsular thickening, and periarticular fluid. Results. Increased thickness of the supraspinatus tendon was found in both symptomatic and asymptomatic patients. Capsular thickening at the hip was present in all symptomatic patients, and in 3 of 8 asymptomatic hips. Joint and bursal fluid was common in the symptomatic group, and was present in some asymptomatic individuals. Osseous lesions were detected in the absence of plain film findings, and demonstrated variable signal intensity. Conclusions. MRI is useful in detecting signs of dialysis-related amyloidosis. Findings of a milder degree in asymptomatic dialysis patients suggests that MRI may also be valuable in the early diagnosis of this syndrome.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1432-2161
    Keywords: Key words Periosteal ganglion ; Ganglion ; Bone neoplasms ; Diagnosis ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To clarify the clinicopathological features of periosteal ganglion. Design. Three patients with periosteal ganglion were studied clinicopathologically. Patients. One patient was selected from the files of our institute and two from a consultation file. Results and conclusions. All three lesions were located over the medial aspect of the tibia. Plain radiographs showed cortical erosions of varying degrees and mild periosteal reaction of the medial side of the tibia. MR images demonstrated well-circumscribed lesions overlying the cortical bone of the tibia, shown as low-intensity areas on T1-weighted images. On T2-weighted images, lesions were homogeneous, lobulated, and showed a characteristic markedly increased signal intensity. These findings are helpful in making a diagnosis of periosteal ganglion. Each patient had an uneventful clinical course after an excision involving the wall of the ganglion, the adjoining periosteum, and the underlying sclerotic cortical bone.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 11
    ISSN: 1432-2161
    Keywords: Key words Lumbar spine ; Lumbosacral junction ; Transitional vertebra ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To identify on sagittal magnetic resonance imaging (MRI) scans of the lumbar spine the features that indicate the presence of a lumbosacral transitional vertebra (LSTV). Design. One hundred consecutive sagittal T1- and T2-weighted MRI scans of the lumbar spine were reviewed and separated into four types depending upon the absence or presence of disc material between what was considered to be the uppermost sacral segment and the remainder of the sacrum, as follows: type 1: no disc material present; type 2: a small residual disc, not extending for the whole anteroposterior (AP) diameter of the sacrum; type 3: a well-formed disc extending for the whole AP diameter of the sacrum; type 4: a well-formed disc extending for the whole AP diameter of the sacrum with, in addition, an abnormal upper sagittal sacral outline. The corresponding plain radiographs of each patient were then reviewed and assessed for the presence of an LSTV. These were classified according to the method of Castellvi et al. Patients. All patients had been referred for MRI of the lumbar spine, usually because of back pain with or without radiculopathy. There were 51 male and 49 female patients with a mean age of 42 years and an age range of 18–85 years. Results and conclusions. With regard to sacral morphology on MRI, 30 patients had type 1, 42 patients type 2, 16 patients type 3 and 12 patients type 4 morphology. Fifteen patients had an LSTV. There was a good correlation between the presence of a fused LSTV and a type 4 MRI appearance, indicating that this type of LSTV can be identified on sagittal MRI scans.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 25 (1996), S. 279-282 
    ISSN: 1432-2161
    Keywords: Key words Sinus histocytosis ; Osseous ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The case of a 20-year-old female with SHML and osseous involvement is presented. We describe three different patterns of involvement in the diametaphyseal portions of the long bones with similar MRI signal characteristics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 25 (1996), S. 298-301 
    ISSN: 1432-2161
    Keywords: Key words Hemorrhage ; Bursitis ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Simple prepatellar bursitis is easily diagnosed both clinically and by MRI. MRI shows the typical T1 and T2 lengthening of fluid within the bursa. However, because of complex MRI appearance of hemorrhage, chronic hemorrhagic bursitis and the size of the prepatellar mass the clinical and MRI appearance can be very different.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 25 (1996), S. 305-307 
    ISSN: 1432-2161
    Keywords: Key words Fat necrosis ; MRI ; Soft tissue mass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  We report the MR appearance of a case of subcutaneous fat necrosis, which is a previously unreported etiology for knee mass. The role of MR imaging in differentiating fat necrosis from other causes of soft tissue masses is discussed. We conclude that MR characteristics of subcutaneous fat necrosis are typical and allow its differentiation from other types of soft tissue lesions.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 15
    ISSN: 1432-2161
    Keywords: Key words Soft-tissue neoplasm ; MRI ; Chondroid lipoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Chondroid lipoma is a recently described benign tumor of adipose origin which, pathologically, mimics myxoid liposarcoma and myxoid chondrosarcoma. This tumor typically presents as a well-defined mass in the superficial tissues of the extremities. In this report, we present the magnetic resonance imaging (MRI) appearances of a pathologically proven chondroid lipoma. To our knowledge, this is the first report of any imaging findings associated with this tumor.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 18 (1996), S. 271-273 
    ISSN: 1279-8517
    Keywords: Bilateral schizencephaly ; MRI ; Migrational disorder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Nous présentons un cas de schizencéphalie bilatérale ouverte caractérisé par une présentation clinique atypique et une imagerie par résonance magnétique nucléaire caractéristique. La patiente est encore vivante, en bonne santé, à plus de 40 ans, elle n'a jamais présenté de crise comitiale et, bien que les troubles moteurs soient bien corrélés aux altérations cérébrales, les troubles neuro-comportementaux ne sont pas proportionnels aux images IRM de cette malformation cérébrale.
    Notes: Summary We present a case with a characteristic magnetic resonance image (MRI) of bilateral open-lipped schizencephaly and atypical clinical presentation. The patient is still alive and in good health in her forties, she has never presented seizures, and although the motor dysfunction is well correlated with cerebral lobe involvement, neurobehavioral dysfunction is not proportional to the MR image of the cerebral malformation.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 17
    ISSN: 1279-8517
    Keywords: MRI ; White matter ; Brain anatomy ; 3-D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une connaissance très précise de l'anatomie cérébrale est nécessaire à l'appréciation d'une lésion à ce niveau. Si les sillons permettent l'identification très précise des aires corticales, il en est tout autrement pour les faisceaux de substance blanche. Le but de ce travail est un essai d'évaluation topographique de certains grands faisceaux en s'aidant de l'imagerie 3-D en IRM (étude faite avec un sigma 1.5 T GE et le programme Voxtool de General Electric pour l'évaluation de la surface du cerveau). Cette étude est intéressante lorsque des anomalies de la substance blanche sont observées chez des patients présentant un syndrome de dysconnexion ou des déficits neuropsychologiques visuels ou du langage. Elle peut aussi servir à titre pédagogique dans les domaines clinique, anatomique ou radiologique. Elle devrait aussi aider à la compréhension de certaines activités cérébrales en pathologie ou pour comprendre le résultat des explorations fonctionnelles (PET, IRM fonctionnelle). En effet, il est exceptionnel qu'une activité corticale soit isolée et la mise en jeu de zones corticales différentes ne peut se faire que par le jeu des connexions établies par les fibres de la substance blanche du cerveau. Le but de ce travail est de proposer un petit atlas 3-D qui en montre la topographie pour les plus importants d'entre eux.
    Notes: Summary An accurate knowledge of cerebral anatomy is important in order to evaluate the precise location of a cerebral lesion. Cortical structures are identified by knowledge of the adjacent gyri and sulci; however, white matter tracts are difficult to differentiate from one another due to the lack of clear anatomic landmarks. Therefore, even if MRI shows obvious white matter abnormalities, in some cases it is difficult accurately to localize the lesion. The purpose of this study is to evaluate the location of the main white matter tracts by using three-dimensional MR imaging. MRI study was performed by 1.5 Tesla (Signa: General Electric). Computer assisted analysis with Voxtool software (General Electric) was used to generate both surface brain and tomographic images. The exact anatomic basis of white matter signal abnormalities is important when analyzing patients with disconnective syndromes or neuropsychological deficits such as conduction aphasia, visuospatial deficit etc. This preliminary attempt at constructing a three-dimensional MRI white matter atlas of the brain may be helpful for evaluating the anatomico-clinical correlations in these patients, and also as teaching materials for the clinical (neurologic, neurosurgical), anatomic and radiographic disciplines.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 18 (1996), S. 315-321 
    ISSN: 1279-8517
    Keywords: Anatomy ; MRI ; Pons ; Veins ; Contrast medium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Le pont, enveloppé des citernes subarachnoïdiennes, est parcouru à sa surface par de nombreux vaisseaux qui constituent autant de points de repère topographiques en IRM que de rapports chirurgicaux. Nous présentons une étude de l'anatomie veineuse en coupe telle que l'IRM la révèle après injection de Gadolinium. Cette étude prospective comporte 40 patients indemmes de lésion de la fosse crânienne postérieure. Le pont est longé par un des collecteurs majeurs du tronc cérébral : la v. pétreuse supérieure, identifiée dans 95 % des cas. Elle se jette par un crochet caractéristique dans le sinus pétreux supérieur. La v. pétreuse inférieure n'a jamais été reconnue. Les vv. pontiques forment un réseau maillé visible dans 72,5 % des cas en coupes axiales et comportant des axes transversaux et longitudinaux dont les critères d'identification sont présentés selon le plan de coupe.
    Notes: Summary The pons is covered by a rich venous network offering numerous vascular landmarks in MRI and during surgery. We present an original study of the veins as they appear on MR multiplanar scans after gadolinium IV injection. This prospective study is based on 40 consecutive patients with normal posterior fossa structures. One of the major venous collectors follows the pons: the superior petrosal v. was identified on MRI in 95% of our cases. Its hooklike extremity drains into the superior petrosal sinus. The inferior petrosal v. was never identifiable. The superficial pontine venous network are identified in 72.5% of cases in the axial plane and were organised in longitudinal and transverse collectors, whose MR aspects are presented here.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 138 (1996), S. 350-354 
    ISSN: 0942-0940
    Keywords: Cerebello-pontine angle ; CT scan ; epidermoid ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors present the case of a patient accurately diagnosed and operated on for an epidermoid cyst in the CPA region, 30 years after the clinical onset with the initial symptom of hypoacusis. At the time of the operation, the patient presented with advanced CPA syndrome, and the tumour had grown to an enormous size. Complete capsule removal was not attempted due to its tenacious adherence to vital neurovascular structures. Thirteen years after surgery, the patient underwent a second operation due to tumour regrowth. The case provides supporting evidence that the clinical findings of a CPA epidermoid cyst may be minimal, and remain so for extended periods of time until the tumour has spread widely. Epidermoids tend to insinuate in the cisterns around cranial nerves, blood vessels, and the brainstem, rather than compressing these structures. The importance of early detection and radical removal, presently facilitated by Magnetic Resonance Imaging, is emphasized.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 138 (1996), S. 1019-1026 
    ISSN: 0942-0940
    Keywords: Brain tumours ; laser surgery ; MRI ; photocoagulation ; stereotaxy ; ultrasound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary One of the most recent laser treatment modalities in neurosurgery is interstitial laser thermotherapy (ILTT). In this review, experimental and clinical studies concerning intracranial ILTT are discussed. Two methods for intra-operative control of the laser induced lesions are described; i.e., computer-controlled power delivery, using a thermocouple that is positioned interstitially at the periphery of the tumour to maintain the desired temperature at that point, and MRI, to visualise the extent of the thermal lesions induced by ILTT. The results show that ILTT using a Nd:YAG laser is easy and relatively effective in the treatment of small deepseated brain tumours with minimal risk and complications. This review is concluded with suggestions for further improvement of this treatment modality.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 21
    ISSN: 0942-0940
    Keywords: Gamma Knife ; MRI ; Stereotactic atlas ; rat ; stereotactic device
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Stereotactic devices for experimental Gamma Knife irradiation and magnetic resonance imaging (MRI) have recently been developed for experimental studies using rats [6, 7]. The present study examined the accuracy of these devices using the following two approaches. In the first approach, Gamma Knife irradiation was performed using the stereotactic device with targets based on a standard stereotactic atlas. Gadolinium-enhanced T1-weighted magnetic resonance imaging was performed using the MRI stereotactic device. Animals were then sacrificed after Evans blue injection, and the rat brain was sliced using an attachment to the stereotactic device. The center coordinates of the gadolinium-enhanced area from the MRI and Evans blue-stained area from the tissue sections were obtained using a computer-assisted image analysis system. These coordinates were compared with the target coordinates planned from the stereotactic atlas. In the second approach, a thermoluminescence dosimeter was implanted in the rat brain. Stereotactic MRI was performed using the stereotactic MRI device, and the coordinates of the implant were obtained. Gamma Knife irradiation was then performed at this target using the stereotactic device. The absorbed dose was measured and compared with the planning dose. These experiments demonstrated a spatial error of 0.6 mm (standard error ± 0.07) between Gamma Knife irradiation based on a comparison of the atlas coordinates and the lesion, and a spatial error of 1.0 mm (standard error ± 0.13) based on a comparison of the stereotactic MR images and the lesion. Gamma Knife irradiation based on MR images using the stereotactic device demonstrated a maximum error of 10% in absorbed dose at the target center. Together, the stereotactic devices for Gamma Knife irradiation and magnetic resonance imaging provide useful tools for Gamma Knife research in an animal model.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 22
    ISSN: 1432-1084
    Keywords: Metalloporphyrins ; Myocardial infaction ; Necrosis ; MRI ; Contrast media
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In previous experiments in tumors we demonstrated that metalloporphyrins are particularly avid for nonviable tumor components. This study was performed to find out wether these agents can be used as MRI contrast agents for the visualization of acute myocardial infarction (MI). A total of 44 rats, 6 normal controls and 38 with occlusive MI (2–24 h old), were used. Gadolinium mesopophyrin (Gd-MP) or manganese totraphenylporphyrin (Mn-TPP) was intravenously injected at doses of 0.1, 0.05, and 0.01 mmol.kg. Three to 24 h after injection, axial and coronal T1-weighted (TR/TE 300/15 ms) spinecho MR images were obtained before and after killing the animals and correlated with triphenyl tetrazolium chloride (TTC) histocemical preparations. The Gd-MP content in infarcted and noninfarcted myocardium was measured using inductively coled plasma atomic emission spectroscopy (ICP-AES) MRI without contrast media could not discern the MI. However, 3–24 h after injection of either Gd-MP or Mn-TPP, the infarcted area was positively stained on MR images. This area matched well witht he negatively TTC-stained area on the heart slices (r = 0.97). The contrast ratios between the infarcted nectrotic myocardium and the noninfarcted regions varied from 150 to 300% depending on the tye of agensts and doses used. Neither false-positive nor false-negative findings were encountered. The metallaporphyrin concentration was more than 10 times higher in the infarcted than in the noninfarcted heart. Metalloporphyrins appear to be promising MRI contrast agents for detection and quantification of necrosis in MI. These preclinical results may open new perspectives in cardiac imaging.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 23
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 6 (1996), S. 170-176 
    ISSN: 1432-1084
    Keywords: Endoscopy ; Sinusitis ; CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The almost simultaneous introduction of nasal endoscopy and CT imaging led to better understanding of normal and pathologic function of the paranasal sinuses. Diagnosis and treatment of many paranasal sinus diseases improved considerably. Endoscopy and CT are not concurrential; they are complementary, but they have specific strengths and weaknesses, as well as specific indications and considerations. Staging systems for chronic sinusitis are currently used based on CT findings and response to medical therapy. Functional endoscopic sinus surgery (FESS) has become the standard procedure for most surgical cases of chronic sinusitis. Indications for FESS have enlarged beyond chronic sinus problems and even beyond the borders of the sinuses. Functional endoscopic sinus surgery aims to gain maximal result (restoring normal function) with minimal trauma and morbidity.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 24
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 6 (1996), S. 523-525 
    ISSN: 1432-1084
    Keywords: Myelographic CT ; MRI ; Spinal injury ; Subarachnoid cyst ; Spinal cord compression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of posttraumatic compressive subarachnoid cyst of the thoracic spine studied by MR, myelography, and myelo-CT is reported. This cyst was surgically confirmed and treated by shunting.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 25
    ISSN: 1432-1084
    Keywords: Aberrant internal carotid artery ; Congenital absence of the internal carotid artery ; CT ; MRI ; MR angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We retrospectively reviewed the imaging features of an aberrant course of the internal carotid artery (ICA) in one patient and its unilateral absence in four. Absence of the ICA was initially detected by MRI and MR angiography in both patients who underwent these examinations. CT revealed an abnormal or absent carotid canal in all cases. Radiological diagnosis by MRI and MR angiography could play an important role in the diagnosis.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 26
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 6 (1996), S. 52-55 
    ISSN: 1432-1084
    Keywords: MRI ; Pubic ring ; Sport medicine ; Osteitis pubis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our purpose was to assess the role of MRI in evaluating themusculoskeletal system in athletes with chronic pain laterally in the groin of unknown etiology. Magnetic resonance imaging (MRI) of the pubic ring was performed in 11 young athletes (soc cer players) with long-standing groin n pain. MR findings were: compared with plain films and isotope examination (bone scan Tc 99M). Abnormal MRI findings included a broadend andirregular symphysis witha characteristics pattern of low signal intensity on T1W and high signal intensity on T2W images localized in the superior pubic ramus at a distance from the symphasis. Positive findings wer also observed on plain films and on nuclear medicine studies. However, the imaging findings in the superior pubic ramus of the symphysis was located considerably more laterally on MRI. MRI is :a valuable method for evaluating discrete and ambiguous pelvic pain in athletes. particularly for identifying concomitant changes in the superior ramus, which may give rise to long-standing localized laterally in the groin.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 27
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 6 (1996), S. 82-85 
    ISSN: 1432-1084
    Keywords: Extra-adrenal pheochromocytoma ; Liver tumor ; CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pheochromocytomas are uncommon tumors that represent a potentially curable cause of hypertension. They are usually located in the adrenal glands, but 10% arise from extra-adrenal sites, located along the paravertebral sympathetic chains. We report a case of primary hepatic pheochromocytoma responsible for a severe hypertension in a 24-year-old man. Echotomography showed a lightly heterogeneous mass located in the segment 8 of the liver. Iodine 131 — metaiodobenzylguanidine scintigraphy showed a large hepatic concentration of the tracer and no other localization. This tumor appeared highly vascularized on enhanced CT scan and on aortic angiography. Magnetic resonance imaging revealed a hepatic tumor with a high signal intensity on T2-weighted images and with a signal isointense to the liver on T1-weighted images. The hepatic venous sampling contained the highest catecholamine level, whereas the adrenal venous sampling was normal. After surgical resection of the hepatic tumor, the tension level and catecholamines plasmatic level normalized. No recurrent symptoms appeared during a 3-year follow-up.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 28
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 6 (1996), S. 312-325 
    ISSN: 1432-1084
    Keywords: Heart ; MRI ; Coronary angiography ; Image quality ; Image interpretation ; Image artifacts ; MRA ; Cardiac MR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Our purpose was to assess image quality and interpretation problems of two-dimensional (2D) coronary MR angiograms. The coronary arteries of 27 subjects (12 normal volunteers and 15 patients) were evaluated with 2D coronary MR angiography (MRA). Coronary MRA was performed with a fat-suppressed electrocardiographically gated breath-hold gradient-echo sequence with k-space segmentation using a 1.5-T imager. Image quality throughout the study was occasionally degraded by: image ghosting (22%), ringing (19%), and/or blurring (22%) and incomplete fat-suppression (19%). Intermittent difficulties with breathholding were encountered in 44% of subjects. When limiting the analysis to those images with optimal image quality, interpretative difficulties were sometimes found: misregistration due to inconsistent breathholding (37%); difficulty in distinguishing veins from arteries (37%); obscured anatomy due to overlapping structures (26%); and poor visualization of portions of the left main coronary artery (59%). Two-dimensional coronary MRA studies have image quality and interpretive problems which need to be understood and addressed before routine clinical scanning is initiated.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 29
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Leber ; MRT ; Kontrastmittel ; Resovist® ; Eovist® ; Key words Liver ; MRI ; Contrast agents ; Resovist ; Eovist
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The purpose of this work is to describe our initial clinical experience (in 66 patients) with Resovist and Eovist, two new liver-specific MR contrast agents. We focus our report on safety aspects, dose finding, and optimization of technical parameters. Both contrast agents were well tolerated and improved the detectability of focal liver lesions. With Resovist, postcontrast MRI may be started as early as 10 min following injection. The dose of 8 μmol Fe/kg bodyweight was sufficient to achieve diagnostic tumor-liver contrast levels. Since Eovist can also be administered as a bolus, dynamic enhance- ment patterns may be studied for tumor characterization as well. Breath-hold T 1-weighted FLASH images were superior to other T 1-weighted techniques with and without fat saturation.
    Notes: Zusammenfassung In der vorliegenden Arbeit werden erste klinische Ergebnisse (66 Patienten) der für die Leberbildgebung entwickelten Kontrastmittel Resovist® und Eovist® vorgestellt. Es wurden Sicherheitsaspekte, Dosierungsfragen und die optimale Untersuchungstechnik am Beispiel fokaler Leberläsionen untersucht. Beide „leberspezifischen“ Kontrastmittel zeigten bei guter Verträglichkeit eine Verbesserung des Nachweises fokaler Leberläsionen. Die Untersuchung mit Resovist® kann bereits 10 min nach der Kontrastmittelinjektion erfolgen. Mit einer Dosis von 8 μmol Fe/kg Körpergewicht konnte eine ausreichender Tumor-Leber-Kontrast erzielt werden. Da Eovist® zusätzlich im Bolus injiziert werden kann, ergeben sich neben dem Nachweis fokaler Leberläsionen Möglichkeiten der Charakterisierung durch Analyse der Perfusionsmuster. Atemgehaltene T 1-gewichtete FLASH-Sequenzen waren sonstigen T 1-gewichteten Sequenzen ohne und mit Fettgesättigung überlegen.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 30
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 36 (1996), S. 646-656 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Bildgebung ; Therapie ; Arthritis ; MRT ; Knochenszintigraphie ; Key words Imaging ; Therapy ; Arthritis ; MRI ; Bone scintigraphy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Osteoarthritis (OA) and rheumatoid arthritis (RA) are chronic diseases in which pathological anatomy changes very slowly. Whilst clinical and laboratory measures can be used to evaluate therapeutic response, assessment of disease progression requires imaging. Conventional radiography has performed well in RA but is too insensitive in OA. Never have imaging techniques been discussed which focus on the sites of fundamental pathological change in cartilage and synovia. Such techniques would provide potential end-points for measuring disease progression and the efficacy of therapeutic intervention. Many are non-invasive but are still at a developmental stage. Expense and complexity currently restricts their use to research. However, improving imaging hardware and information technology provide an exciting future for radiologists involved in joint imaging. Clinical trials involving techniques described here are just around the corner.
    Notes: Zusammenfassung Degeneration und rheumatoide Arthritis sind chronische Erkrankungen, deren pathologische Symptome sich nur sehr langsam ändern. Während Klinik und Laborparameter zur Therapiekontrolle verwendet werden können, erfordert die exakte Feststellung des Krankheitsfortschritts den Einsatz der Bildgebung. Konventionelle Röntgenaufnahmen können hierfür bei Patienten mit rheumatoider Arthritis gut verwendet werden. Bei Degeneration erscheint dieses Verfahren sehr insensitiv. Neue Bildgebungsmethoden, wie MRT und Knochenszintigraphie, erlauben eine bessere Beurteilung der eigentlichen pathoanatomischen Grundlagen dieser Erkrankung – Knorpel und Synovia. Krankheitsfortschritt und Wirksamkeit von unterschiedlichen Therapien sind damit besser überwachbar. Allerdings sind diese neuen Methoden zum Großteil noch in Entwicklung. Kosten und Komplexizität reduzieren ihren Einsatz derzeit weitgehend auf die Forschung. Trotzdem werden Verbesserungen in der Bildgebungshardware und Informationstechnologie für den in der Gelenkbildgebung tätigen Radiologen noch weitere Fortschritte bringen. Entsprechende breite klinische Versuche mit den oben beschriebenen Techniken sind gerade am Beginn.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 31
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 36 (1996), S. 413-418 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Pankreas ; MRT ; MRT des Pankreas ; Key words Pancreas ; MRI ; MRI of the pancreas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary MR imaging of the pancreas is compromised by several problems: motion artifacts from breathing, cardiac and vascular pulsation, and bowel peristalsis. These limitations can be overcome by modern scanner- and software technology. In the meantime, MRI of the pancreas can compete with well established methods as ultrasound and computed tomography (CT). In addition, new sequences provide imaging modalities comparable to angiography and ERCP. In the future, the value and the efficacy of MRI in comparison to CT, and its clinical impact has to be evaluated in clinical studies. In this article, we review the technical development of MRI of the pancreas, and discuss its clinical use.
    Notes: Zusammenfassung Aufgrund von zahlreichen Artefakten, hervorgerufen durch Atemexkursion, Herz- und Gefäßpulsationen und Darmperistaltik, war das Pankreas lange Zeit der Magnetresonanztomographie nur eingeschränkt zugänglich. Neue Hard- und insbesondere Softwareentwicklungen lassen mittlerweile eine Darstellung des Pankreas zu, die den bisher etablierten Untersuchungsverfahren wie Ultraschall und Computertomographie überlegen ist. Mit T1- und T2-gewichteten Scans im Atemstillstand und fettunterdrückenden Techniken gelingt so die bewegungsartefaktfreie Darstellung des Pankreas bei gleichzeitig deutlich erhöhter Kontrastauflösung des intrinsischen Signals des Pankreas. Darüber hinaus lassen zusätzliche Modalitäten wie MR-Angiographie und MR-Pankreatographie diagnostische Aussagen zu, die bisher nur mit invasiven Verfahren (Angiographie und ERCP) zu erlangen waren. Die aktuellen technischen Verfahren der Magnetresonanztomographie des Pankreas werden dargestellt und im klinischen Kontext diskutiert.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 32
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 36 (1996), S. 805-812 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Osteomyelitis ; Pädiatrie ; Ultraschall ; MRT ; Key words Osteomyelitis ; Pediatrics ; Ultrasonography ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The prognosis of acute hematogenous osteomyelitis in children is mainly influenced by early diagnosis and prompt initiation of antibiotic and surgical therapy. In this age group, two forms of manifestation are differentiated: osteomyelitis in infants up to 18 months and juvenile osteomyelitis until the closure of the epiphyseal plate. Osteomyelitis in infants is often accompanied by septic arthritis of the adjacent joint. In juvenile osteomyelitis, the disease is mostly confined to the metaphysis. Plain films and ultrasonography represent the basic imaging modalities. Depending on the age of the child, the clinical course of the disease and the availability of the various methods, MRI and multiphase bone scintigraphy can be performed for further imaging. CT is of only limited value and should only be used for special cases concerning chronic osteomyelitis.
    Notes: Zusammenfassung Die frühzeitige Diagnose und das prompte Einsetzen der antibiotischen und chirurgischen Therapie sind für die Prognose der akuten hematogenen Osteomyelitis im Kindesalter von entscheidender Bedeutung. In dieser Altersgruppe werden 2 Manifestationsformen unterschieden. Die vor Beendigung des 18. Lebensmonats auftretende Säuglingsosteomyelitis und die danach bis zum Schluß der Epiphysenfuge in Erscheinung tretende juvenile Form. Bei der Säuglingsosteomyelitis kommt es in vielen Fällen zu einem Befall des benachbarten Gelenks, bei der juvenilen Osteomyelitis bleibt der primäre Befall fast immer auf die Metaphyse beschränkt. Die Eckpfeiler der Bildgebung stellen das Nativröntgen und die Ultraschalluntersuchung dar. Je nach Alter des Kindes, klinischem Verlauf und Verfügbarkeit der Methoden stehen MRT und die Dreiphasenknochenszintigraphie als weiterführende Untersuchungsmethoden zur Verfügung. Die CT hat begrenzte Aussagekraft und sollte nur besonderen klinischen Fragestellungen im Rahmen einer chronischen Osteomyelitis vorbehalten bleiben.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 33
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 36 (1996), S. 890-896 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter N. facialis ; MRT ; Gadolinium-DTPA ; Entzündliche Fazialisparese ; Key words Facial nerve ; MRI ; Gadolinium-DTPA ; Inflammatory nerve palsy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In inflammatory peripheral facial nerve palsy pathologically intense, linear and smooth enhancement of the distal intrameatal nerve segment can always be observed on T1-w- SE- MR sequences. The other nerve segments often present with a pathological enhancement as well. On T2-w- SE sequences, a thickening of the distal intrameatal nerve segment can be observed. The pathological enhancement persists over weeks and months; even in patients with complete clinical recovery, a persistent enhancement of the distal intrameatal nerve segment can be demonstrated. No correlation can be established between the intensity of the enhancement, the clinical condition and the electrophysiological data on electroneurography. The persistent enhancement of the different nerve segments is due to a long-lasting breakdown of the blood-peripheral nerve-barrier related to the process of degeneration and regeneration of the facial nerve in inflammatory palsy.
    Notes: Zusammenfassung Die entzündliche periphere Fazialisparese ist in der MRT auf T1-gewichteten Bildern durch eine pathologische, lineare, aber glattbegrenzte Kontrastmittelanreicherung im distal intrameatalen Segment gekennzeichnet. In diesem Bereich ist der Nerv auf T2-gewichteten Bildern lokal verdickt und aufgetrieben. Die übrigen Nervensegmente zeigen ebenfalls häufig, aber nicht immer eine verstärkte Kontrastmittelanreicherung. Die pathologische Kontrastmittelanreicherung kann während Monaten persistieren, unabhängig vom Ausmaß der Nervendegeneration und vom klinischen Zustandsbild. Auch nach vollständiger klinischer Besserung läßt sich eine pathologische Anreicherung nachweisen. Es besteht also keine Korrelation zwischen MRT-Befunden, klinischem Zustand und elektrophysiologischen Daten. Im Rahmen der Degeneration und Regeneration des Nerven führt die persistierende Störung der Blut-peripheren Nerven- Schranke zu einer langanhaltenden Gadoliniumanreicherung einzelner Nervensegmente.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 34
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Kontrastmittel ; Hochdosis ; Metastasen ; Gliome ; MRT ; Key words Contrast agents ; High-dose study ; Cerebral metastases ; Glioma ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In analogy with high-dose contrast-enhanced CT, there have been a few studies during recent years that have dealt with high-dose paramagnetic contrast dyes in MRI. One reason for these studies was the development of new and low-osmolar contrast agents in the MR field. Depending on the clinical problem, a high-dose contrast study in MRI is rarely indicated: (1) in metastatic disease, MR imaging with high-dose contrast material is indicated when the standard dose study is negative or only shows a solitary cerebral lesion or a number of lesions just suitable for radiosurgery; (2) in patients with malignant glioma the high-dose study allows better definition of the tumor margins. If a radical surgical approach is planned, the diagnostic potential should be fully used; if only a biopsy or subtotal debulking is planned, a standard dose study is enough. (3) in patients with MS, a high-dose study is only recommended within therapeutic trials in which the number of active plaques is a primary variable.
    Notes: Zusammenfassung In Analogie zu Erfahrungen mit der Hochdosiskontrastverstärkung in der CT wurden in den letzten Jahren Untersuchungen zur höheren Dosierung der paramagnetischen Kontrastmittel in der MRT gemacht. Dabei spielte auch auf dem MR-Sektor die Entwicklung von niedrig osmolaren Kontrastmitteln eine Rolle. In Abhängigkeit von der konkreten Fragestellung ist die Hochdosis-KM Gabe im kranialen MRT derzeit nur selten indiziert: 1. Zeigt das MR nach der KM-Standarddosis nur eine singuläre intrazerebrale Metastase oder aber eine Anzahl von Metastasen, bei der die Radiochirurgie gerade noch indiziert ist, ist eine zweite MR-Untersuchung mit einer Gesamtdosis von 0,3 mmol/kg KG zu empfehlen. Dies gilt auch, wenn unter der Standarddosis keine zerebrale Metastase bei malignem Grundleiden sichtbar ist. 2. Bei malignen hirneigenen Tumoren ermöglicht die Hochdosis-KM-Gabe eine bessere Definition der Tumorgrenzen. Wenn eine radikale Operation möglich erscheint, sollten die diagnostischen Möglichkeiten voll ausgeschöpft werden. Ist nur eine Biopsie oder eine subtotale Operation geplant, ist die Standarddosis ausreichend. 3. Bei der multiplen Sklerose ist die Hochdosis KM-Gabe nur in Therapiestudien indiziert, wenn eine der Zielvariablen die Anzahl der aktiven Plaques ist.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 35
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 36 (1996), S. 663-666 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Malignes Schwannom ; Rektum ; CT ; MRT ; Key words Malignant schwannoma ; Rectum ; CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Malignant schwannomas are rare. These malignomas are primary nerve sheath tumors that usually arise from a peripheral nerve. They appear most frequently in the lower extremities, including the hips and buttocks (34.8 %), the upper extremities (23.4 %), and in the trunk (17 %). To the best of our knowledge, this is the first reported case of a malignant schwannoma of the rectum. We describe the rare disease with reference to the literature.
    Notes: Zusammenfassung Maligne Schwannome haben einen Anteil von 10 % an den malignen Weichteiltumoren, welche nur 1 % aller bösartigen Neubildungen ausmachen. Am häufigsten treten die malignen Schwannome im Bereich der unteren Extremitäten einschließlich Hüfte und Gesäß (34,8 %), im Bereich der oberen Extremitäten (23,4 %) und im Rumpf (17 %) auf. Unseres Wissens ist dies der erste Fall eines malignen Schwannoms des Rektums, der in der Weltliteratur beschrieben wird. Wir berichten über das seltene Krankheitsbild und geben einen Überblick über die Literatur.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 36
    ISSN: 1432-1084
    Keywords: MRI ; Staging ; Urinary bladder cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Since the introduction, pelvic MRI has been considered the best non-invasive technique for primary staging of urinary bladder cancer. Before using MRI an understanding of normal and pathological MR images of the urinary bladder is essential. This review therefore describes the MR anatomy of the urinary bladder as well as the appearances of carcinoma. MRI plays an important clinical role in staging the primary tumour. In superficial tumours, clinical staging, which includes transurethral biopsy, is the best technique. For invasive tumours, MRI is superior to other techniques such as CT scanning, transvesical ultrasonography and clinical staging. A limitation of both MRI and CT scanning is their inability to recognize minimal tumour growth in the muscle layer of the bladder wall, or to differentiate between post-transurethral resection oedema and tumour. Therefore, in all patients with urinary bladder cancer staging should preferably start with MRI followed by clinical staging. Unfortunately, however, because of the high cost of this strategy, MRI has to be reserved for staging deeply invasive and superficial poorly differentiated tumours.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 37
    ISSN: 1432-1084
    Keywords: Intracerebral malignant fibrous histiocytoma (MFH) ; CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The CT and MRI findings in a case of an intracranial malignant fibrous histiocytoma are reported. Pathological correlation was demonstrated and tumour vascularization was best seen at angiography. Despite its low incidence in brain. MFH is of special interest because of its ubiquitous location and poor prognosis.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 38
    ISSN: 1432-1076
    Keywords: Congenital muscular dystrophy ; Laminin ; Extracellular matrix ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The laminins comprise of a family of heterotrimeric proteins of the extracellular matrix. The cross-shaped proteins consist of a heavy α-chain and two light chains, called β and γ. Each group of chains, classified on their sequence identity and domain organization, include different isoforms. A deficiency of the α2 chain of laminin-2, previously termed merosin or M component, was shown to be responsible for one form of congenital muscular dystrophy (CMD). We investigated muscle biopsies of 20 patients with the clinical diagnosis of CMD and histological evidence of muscular dystrophy for the expression of different laminin chains. Patients with evidence of pachygyria/lissencephaly of the CNS were excluded from this series. The immunohistochemical analysis was correlated to clinical findings and MRI data of the brain. Of 20 patients, 11 (55%) revealed complete or near-complete deficiency of the α2 chain in their skeletal muscle specimens. So far none of these patients became ambulant. Of 20 patients 2 showed partial but clear-cut α2 chain-deficiency. These two patients became ambulant at 18 months and 3 years. All 13 patients with complete or partial α2 chain-deficiency demonstrated cerebral white matter changes on MRI. In contrast, 6/7 CMD patients with normal α2 chain expression became ambulant and none of the 6/7 tested showed evidence of cerebral abnormal T2 sequence signal of the myelin on MRI.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 39
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 6 (1996), S. 557-560 
    ISSN: 1432-1084
    Keywords: Giant cell tumour ; MRI ; Temporomandibular joint
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The authors report a case of giant cell tumour of the mandibular condyle, which is a rare finding. This tumour, studied using the main three radiological modalities (plain radiography, CT and MRI), showed characteristic radiological features of “giant cell tumour”.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 40
    Electronic Resource
    Electronic Resource
    Springer
    Child's nervous system 12 (1996), S. 280-282 
    ISSN: 1433-0350
    Keywords: Joubert syndrome ; Cranial meningocele ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Joubert syndrome was first reported in 1969 as a rare, recessive autosomal syndrome associated with neuropathological abnormalities of the cerebellum and brain stem, partial or complete aplasia of the cerebellar vermis, and presenting with episodic hyperpnea and apnea, oculomotor abnormalities, and psychomotor retardation. Having experienced one case of this syndrome with associated cranial meningocele, we report the clinical course, MRI features, and surgical findings, and discuss the relevant literature.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 41
    ISSN: 1433-0350
    Keywords: Cavernous angiomas ; Infant ; Management ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A rare case of multiple cavernous angiomas with repeated hemorrhages in a 9-month-old male infant is presented, together with sequential computed tomography (CT) and magnetic resonance (MR) images. The infant underwent hematoma evacuation for left cerebellar hemorrhage, and his postoperative course was uneventful. The multiple cavernous angiomas receded gradually without any treatment except the hematoma evacuation. Two years following presentation, he continues to do well. To the authors' knowledge, this is the first report of multiple cavernous angiomas with brain stem involvement in an infant.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 42
    ISSN: 1433-0350
    Keywords: Saethre-Chotzen syndrome ; EEG ; Seizures ; CT scan ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Saethre-Chotzen syndrome is a form of acrocephalosyndactyly with autosomal dominant inheritance, characterized by craniosynostosis, facial asymmetry, palpebral ptosis, deviated nasal septum, partial cutaneous syndactyly, and various skeletal abnormalities. We studied in detail the neurological, EEG, and neuroradiological features of a group of 11 (6 male, 5 female) patients with Saethre-Chotzen syndrome. Four subjects were affected by seizures; they had paroxysmal EEG abnormalities, and gross neuroimaging revealed destructive brain lesions or malformations. Our findings suggest that CNS involvement in Saethre-Chotzen syndrome might be more severe than previously reported and support the wider use of neurophysiological and neuroimaging techniques in the study of children with this syndrome.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 43
    ISSN: 1432-2161
    Keywords: Key words Osteosarcoma ; Parosteal osteosarcoma ; Dedifferentiation ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  This report describes a low-grade parosteal osteosarcoma of the ulna with dedifferentiation into high-grade osteosarcoma. The clinical, pathological, and imaging findings are described and discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 44
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 25 (1996), S. 501-504 
    ISSN: 1432-2161
    Keywords: Key words MRI ; neuropathy ; Radiography ; neuropathy ; MRI ; soft tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Radiographic and MR findings of two cases of hereditary sensory and autonomic neuropathy type I are reported. This rare disease has a non-specific radiographic and MR appearance. Differential diagnosis includes other types of hereditary and acquired sensory neuropathies affecting small myelinated and unmyelinated nerve fibers, as well as vascular abnormalities and lesions of the spinal cord.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 45
    ISSN: 1432-2161
    Keywords: Key words Spine ; Osteoblastoma ; Scoliosis ; Paravertebral muscles ; CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To illustrate the variety of paravertebral muscle abnormalities as seen on computed tomography (CT) or magnetic resonance imaging (MRI) in association with spinal osteoblastomas and correlate the findings with the presence of scoliosis. Design. In a retrospective study the clinical notes, plain radiographic, CT and/or MRI features were reviewed for the presence of scoliosis and paravertebral muscle abnormality (either inflammation or atrophy). Patients. Twelve patients (7 male, 5 female) with a mean age of 17 years were studied. Three lesions occurred in the cervical spine, five in the thoracic spine and four in the lumbar spine. Results and conclusions. Nine patients had scoliosis. All patients with a thoracic or lumbar lesion and scoliosis (n=8) had an associated abnormality of the paravertebral muscles (usually atrophy with fatty replacement). One patient with a lumbar lesion and no scoliosis had normal paravertebral muscles. One patient with a cervical lesion had thoracic scoliosis but no muscle abnormality in the cervical region, while two patients with cervical lesions and no scoliosis showed muscle abnormalities. The results support the clinical hypothesis that scoliosis in patients with spinal osteoblastoma is due to paravertebral muscle spasm, although this would not appear to be the case for cervical lesions.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 46
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 25 (1996), S. 661-665 
    ISSN: 1432-2161
    Keywords: Key words Coccidioidomycosis ; Arthritis ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. The authors assessed the MRI findings of appendicular coccidioidal arthritis. Design. T1- and T2-weighted MR images of affected joints, both with and without intravenous gadopentetate dimeglumine, were performed in nine adult patients (ten studies) and evaluated by three masted readers, using a four-point certainty scale for: synovial abnormality, articular cartilage loss, subarticular bone loss, abnormal marrow signal, enhancement of osseous and articular structures, and assessment of disease activity. Findings were correlated with biopsy results or clinical course. Results. Eight patients had active and one had inactive arthritis, involving the knee (five patients), ankle (two patients), and elbow (one patient). Synovial complex was the most common finding in active arthritis (P〈0.025). Cartilage and subarticular bone loss were seen 56% and 89% of patients with active disease, respectively. Abnormal marrow signal was uncommon (two patients). All cases showed synovial and/or osseus enhancement. Conclusions. MRI findings in coccidiodal arthritis are described. Enhancement of thickened synovium and erosions was seen after intravenous gadopentetate.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 47
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 25 (1996), S. 703-709 
    ISSN: 1432-2161
    Keywords: Key words Articular cartilage ; MRI ; Articular cartilage ; review article ; Osteoarthritis ; imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Various imaging methods have been applied to assessment of articular cartilage. These include standard radiography, arthrography, CT, CT arthrography, ultrasonography, and MR imaging. Radiography remains the initial musculoskeletal imaging method. However, it is insensitive to early stages of cartilage abnormalities. MR imaging has great potential in the assessment of articular cartilage, although high-quality scans are required because imaging signs of cartilage abnormalities may be subtle. The potential and limitations of various sequences and techniques are discussed, including MR arthrography. The role of the other imaging methods in assessment of articular cartilage appears to be limited.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 48
    ISSN: 1432-2161
    Keywords: Key words Chondromalacia ; Cartilage ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To develop MR criteria for grades of chondromalacia patellae and to assess the accuracy of these grades. Design. Fat-suppressed T2-weighted double-echo, fat-suppressed T2-weighted fast spin echo, fat-suppressed T1-weighted, and gradient echo sequences were performed at 1.5 T for the evaluation of chondromalacia. A total of 1000 MR, 200 histologic, and 200 surface locations were graded for chondromalacia and statistically compared. Results. Compared with gross inspection as well as with histology the most accurate sequences were fat-suppressed T2-weighted conventional spin echo and fat suppressed T2-weighted fast spin echo, although the T1-weighted and proton density images also correlated well. The most accurate MR criteria applied to the severe grades of chondromalacia, with less accurate results for lesser grades. Conclusions. This study demonstrates that fat-suppressed routine T2-weighted and fast spin echo T2-weighted sequences seem to be more accurate than proton density, T1-weighted, and gradient echo sequences in grading chondromalacia. Good histologic and macroscopic correlation was seen in more severe grades of chondromalacia, but problems remain for the early grades in all sequences studied.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 49
    ISSN: 1432-2161
    Keywords: Key words Humeral avulsion ; Shoulder dislocation ; MRI ; MR arthrograhpy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To demonstrate the MRI findings of an anterior shoulder capsular avulsion from the humerus, with or without subscapularis rupture, after anterior dislocation or severe abduction external rotation injury. Design and patients. We retrospectively reviewed the MRI and MR arthrographic examinations of seven patients who were identified at surgery with avulsion of the anterior shoulder stabilizers from the humerus. MRI was correlated with clinical history and surgical results. Results. MRI findings included: inhomogeneity or frank disruption of the anterior capsule at the humeral insertion (all), fluid intensity anterior to the shoulder (six patients), tear of the subscapularis tendon (six patients), dislocation of the biceps tendon (four patients), and a Hill-Sachs deformity (four patients). MR arthrography additionally found extravasation of contrast through the capsular defect (two patients). Conclusions. Our findings suggest that MRI is helpful for diagnosing humeral avulsion of the anterior glenohumeral capsule, especially when a tear of the subscapularis tendon insertion is present. MR arthrography may be of benefit for diagnosing capsular avulsion without associated subscapularis tendon abnormality.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 50
    Electronic Resource
    Electronic Resource
    Springer
    Child's nervous system 12 (1996), S. 789-793 
    ISSN: 1433-0350
    Keywords: Carotid cavernous sinus fistula ; Surgical embolization ; Intraventricular hemorrhage ; MRI ; Pediatrics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of post-traumatic carotid cavernous sinus fistula complicated by coma-producing intraventricular tamponade in a 6-year-old boy is reported. Urgent surgical treatment included external ventricular draining, trapping and muscle embolization by the Jaeger-Hamby procedure. Follow-up cerebral angiography showed complete obliteration of the fistula. The child made an excellent recovery and now leads a normal life.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 51
    Electronic Resource
    Electronic Resource
    Springer
    Knee surgery, sports traumatology, arthroscopy 4 (1996), S. 232-236 
    ISSN: 1433-7347
    Keywords: Shoulder ; Anterior dislocation ; MRI ; Bankart lesion ; Hill-Sachs lesion ; Arthroscopic lavage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Sports Science
    Notes: Abstract Primary traumatic anterior dislocation of the shoulder in young patients has a high recurrency rate. There are varying opinions on the pathology behind the recurrences. The aim of this study was to describe the MRI characteristics of the acute lesion, and at 6-month follow-up. Thirty patients aged 18–30 years with primary traumatic anterior dislocation of the shoulder were randomized into two groups. One group was treated with acute arthroscopic lavage within 10 days. The control group was treated with traditional non-operative therapy. All patients underwent acute MRI within 10 days and before the arthroscopic lavage, and again at the 6-month follow-up, for evaluation of the lesions. The acute MRI verified Hill-Sachs lesions in all patients. At the 6-month follow-up MRI, there was no change in the size of the Hill-Sachs lesion. This was also the case with the six patients in the control group with recurrent dislocations during the first 6 months. Twenty-nine patients (97%) had joint effusion at the acute MRI, which was very useful for evaluation of the soft tissue pathology. The glenohumeral ligaments were detached in 20/30 patients (66%), and the labrum in 22/30 patients (70%). A capsulolabral detachment classified as a Baker 3 lesion was seen in 16/30 (53%) of the patients, including all six patients with recurrent dislocation. At the 6-month control, only 3/30 (10%) of the patients had joint effusion for adequate evaluation of the labrum and ligamentous pathology. A Hill-Sachs lesion was found in 100% of the patients after primary dislocation, and recurrent dislocations did not change the size of the lesion. The study supports the opinion that this lesion is overlooked in the clinical situation. The joint effusion at the acute MRI was of utmost importance for evaluation of the soft tissue pathology. The 6-month MRI control was therefore considered inconclusive when evaluating capsulolabral lesions, due to lack of effusion. MRI arthrography with contrast administration would have been very helpful at the 6-month examination.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 52
    Electronic Resource
    Electronic Resource
    Springer
    Magnetic resonance materials in physics, biology and medicine 4 (1996), S. 71-75 
    ISSN: 1352-8661
    Keywords: EPR ; oximetry ; in vivo ; biocompatibility ; ischemia ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics
    Notes: Abstract The development of oxygen-sensitive paramagnetic materials is being actively pursued because of their potential applications forin vivo electron paramagnetic resonance (EPR) oximetry. Among these materials, fusinite is of particular interest because of the high sensitivity of the EPR linewidth to the partial pressure pO2. Although this material has led to a number of very useful results in experimental systems, its potential use in humans is limited by the need to prove that it will not cause deleterious effects. The strategy used in this study to optimize the biocompatibility of the oxygen-sensitive materials was to prepare small silicon implants containing the fusinite. The use of silicon permits the diffusion of oxygen inside the implant while the material does not have contact with the biological environment. Radiosterilization did not affect the pO2 sensitivity of the material. The feasibility of performing pO2 measurement was verifiedin vivo by perodically inducing ischemia in the gastrocnemius muscle of mice over a period of 6 weeks.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 53
    Electronic Resource
    Electronic Resource
    Springer
    Journal of anesthesia 10 (1996), S. 83-85 
    ISSN: 1438-8359
    Keywords: Aneurysm ; Tracheomalacia ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 54
    Electronic Resource
    Electronic Resource
    Springer
    Brain topography 9 (1996), S. 101-116 
    ISSN: 1573-6792
    Keywords: MEG ; MRI ; Data fusion ; Localization ; Anatomical constraint ; Registration evaluation ; Multimodal registration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Mapping neuro-physiological functions to high resolution MRI is an effective means to evaluate localization reconstructions and to exhibit the spatio-temporal aspects of dynamic functional processes. The registration step needed between MEG/EEG and MRI is a source of error which, for the worst cases may be greater than errors related to the localization algorithms. Several registration methods can be used: those based on fiducial markers and those based on surface matching. The aim of this paper is to propose a fully automatic surface matching method and to discuss its extended theoretical and experimental evaluation. The registration procedure matches the skin surface, segmented from MRI, and a digitized description of the head performed with a 3D tracker during the MEG/EEG examination. The registration uncertainties at the edges of the MRI volume were estimated to be between 2 and 3 mm. In comparison with commonly used manual methods the improvement in accuracy is significant. Registration uncertainties are smaller than the localization uncertainties usually observed. By minimizing manual intervention, the reliability of the registration process is increased and the accuracy is stabilized. With this automatic registration method the fusion of MEG/EEG localizations with MRI anatomical data gives highly significant information. Finally the accuracy obtained allows the use of complex anatomical constraints in the localization process without introducing large modelling errors.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 55
    ISSN: 1590-3478
    Keywords: MRI ; Optic neuritis ; Multiple sclerosis ; VEP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Si descrivono i risultati ottenuti con indagini di Risonanza Magnetica (RM) dei nervi ottici (eseguite all'esordio e 12 mesi dopo) in 20 pazienti affetti da Neurite Ottica (NO) acuta, valutata in funzione della sintomatologia clinica e delle alterazioni campimetriche e del potenziale evocato visivo. Sono state analizzate le immagini RM in Short Tau Inversion Recovery (STIR) mettendo a confronto i rilievi ottenuti con sequenza Short Time Echo (STE-STIR: 22 msec) rispetto a quelli ottenuti con Long Time Echo (LTE-STIR: 20 msec). Mentre con la convenzionale STE-STIR è stato possibile rilevare lesioni a carico dei nervi ottici nel 57.2% delle Neuriti Acute e nel 42.9% delle Neuriti Pregresse, la metodica LTE-STIR è risultata diagnostica nel 95.2% delle Neuriti Acute e nel 85% delle Neuriti Pregresse. Sia nelle NO acute che nelle pregresse, la lunghezza delle lesioni a carico dei nervi ottici sono risultate significativamente maggiori rispetto a quelle ottenute con la convenzionale metodica STE-STIR.
    Notes: Abstract Magnetic resonance images of optic nerves were obtained in 20 patients with acute optic neuritis (ON), and assessed by means of clinical, visual field and visual evoked potential evaluations; the imaging was repeated 1 year later. The results of the conventional Short Tau Inversion Recovery (STIR) sequence obtained using short time echo (STE-STIR: 22 msec) were compared with those of the long time echo sequence (LTE-STIR: 80 msec). The conventional STE-STIR sequence revealed lesions in 57.2% cases of acute ON and in 42.9% of the optic nerves affected by previous ON: the LTE-STIR sequence was diagnostic in 95.2% of acute ON cases and in 85% of patients with previous ON. The calculated length of the optic nerve lesions was significantly longer in the images obtained using the LTE-STIR sequence than in those obtained using conventional STE-STIR sequences.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 56
    Electronic Resource
    Electronic Resource
    Springer
    Magnetic resonance materials in physics, biology and medicine 4 (1996), S. 3-6 
    ISSN: 1352-8661
    Keywords: MRI ; rf coil ; standing wave ; coaxial cable
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics
    Notes: Abstract An easily constructed, low-capacitive coupling volume coil based on the van Vaals-Bergman coaxial cable coil for high field imaging is described. The coil (designated “lambda coil”) was constructed using two 5/4 length 50ω coaxial cables matched to a 50ω transmission line with LC bridge balun. The standing wave on the single 5/4 lambda length coaxial cable provides two points of current maxima in oppositional direction. Therefore, the four current elements necessary for effective B1 field generation can be obtained by two 5/4 lambda length coaxial cables arranged analogous to 1/2 lambda T-antenna. Capacitive coupling between the coil elements and conductive samples (i.e. animals) is minimized by simply retaining the shield of the coaxial cable for the area of voltage maxima. The lambda coil exhibited excellent performance as a volume coil with a high quality factor and highly homogeneous rf fields. Because of its dramatically simple architecture and excellent performance, the lambda coil configuration appears to be an economical alternative to the original van Vaals-Bergman design, especially for research facilities with a high field magnet and limited bore space.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...