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  • 2000-2004
  • 1990-1994  (33)
  • 1950-1954
  • 1920-1924
  • 1990  (33)
  • MRI
  • 1
    ISSN: 1279-8517
    Keywords: Cerebral ventricular volume ; Cerebrospinal fluid volume ; Volume of encephalic ventricles ; Computerized tomography ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Le volume des ventricules cérébraux a été déterminé d'après des données tomodensitométriques et de résonance magnétique chez 7 sujets sans pathologie apparente et chez 3 malades présentant des ventricules élargis. De nombreuses conditions pathologiques sont susceptibles d'entraîner un tel élargissement ventriculaire, telles la maladie d'Alzheimer et l'hydrocéphalie; aussi la mesure précise de ces structures permet: une aide valable et sûre pour l'établissement du diagnostic de ces maladies et une information importante lors du follow-up de ces patients. Ce travail présente les résultats obtenus au cours de la deuxième phase d'une étude à 3 étapes. La première phase avait démontré la possibilité de mesurer des espaces liquidiens par résonance magnétique, à l'aide de 3 préparations fantômes («ventricules» petits, moyens et larges). Les résultats furent comparés avec ceux obtenus par examen tomodensitométrique des mêmes préparations [4]. La phase actuelle de cette étude compare les volumes obtenus par TDM avec ceux obtenus par IRM chez les mêmes individus. Les calculs volumétriques ont été réalisés à l'aide d'un ordinateur Calcomp 9000 programmé pour compenser les facteurs d'agrandissement et d'épaisseur de coupe des images. Les résultats obtenus d'après les données de l'IRM peuvent être corrélés étroitement avec ceux obtenus par TDM avec ces mêmes patients. La troisième et dernière étape du projet est le développement des données volumétriques obtenues par IRM concernant les ventricules cérébraux chez un plus grand nombre de sujets.
    Notes: Summary The volume of the encephalic ventricles was determined from computerized tomographic (CT) and magnetic resonance imaging (MRI) scans of seven subjects without apparent pathology and three subjects with enlarged ventricles. Since there are many conditions in which the encephalic ventricles become enlarged such as Alzheimer's disease and hydrocephalus, accurate measurement of these structures provides (1) a valuable and safe means of aiding in the diagnosis of such conditions and (2) important follow-up information on affected patients. This paper presents the data obtained from the second phase of a three phase study. The first phase demonstrated the possibility of measuring fluid filled spaces by MRI in three phantom preparations (small, medium, and large “ventricles”). The results were compared with those obtained from the computerized tomography (CT) scans of the same preparations. This phase of the study compares the volumes obtained from CT scans with those obtained from MRI scans of the same individuals. The volumetric calculations were done with the aid of a Calcomp 9000 digital analyser programmed to compensate for the scale factor and slice thickness of the images. The results obtained from the MRI scans correlated closely with those obtained from the CT scans of the same subjects. The third and final phase of the project is the development of an MRI volumetric data base for the encephalic ventricles using a larger number of subjects.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 12 (1990), S. 203-208 
    ISSN: 1279-8517
    Keywords: MRI ; Paranasal sinuses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Le but de ce travail est d'étudier l'anatomie normale et pathologique des sinus paranasaux en IRM. Ceci a été effectué en corrélant les images en IRM de volontaires normaux avec des coupes homologues obtenues par cryosection sur cadavres. L'information ainsi obtenue en IRM a été comparée à celle des radiographies standard et des explorations scanographiques réalisés sur un échantillonnage d'affections des sinus paranasaux. La majorité des situations pathologiques a été correctement mise en évidence par les séquences en T1, alors que des informations tissulaires plus spécifiques des lésions infiltrantes malignes ont justifié l'emploi de séquence en T2. C'est en particulier le cas des tumeurs s'étendant dans les espaces sous-arachnoïdiens, vers le système nerveux central, ou pour définir les tissus dans les sinus privés d'air. A l'exception d'un seul cas d'ostéome ostéoïde, où l'étude radiologique conventionnelle s'est avérée supérieure, l'exploration en IRM fournit des informations égales ou supérieures à celles des autres modalités radiologiques.
    Notes: Summary The purpose of this project was to examine the anatomy and pathology of the paranasal sinuses as seen by MR imaging. This was accomplished through correlations of MR images of normal volunteers with matched cadaver whole organ cryosections. The information obtained by MRI was compared to that of plain films and CT in the detection of a variety of conditions affecting the paranasal sinuses. The majority of the pathological processes could be quite adequately imaged by T1 weighted pulsing sequences. When more tissue specific information was required in some infiltrating malignant lesions, T2 weighting pulsing sequences are quite helpful for tumors that crossed the subarachnoid space into the central nervous system or in characterizing tissues in airless sinuses. Other than the single case of osteoid osteoma where X-ray studies were superior, magnetic resonance provided equal or superior information to the X-ray examinations.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 12 (1990), S. 299-301 
    ISSN: 1279-8517
    Keywords: Neuroanatomy ; Brain ; Limbic system ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Des coupes IRM de l'encéphale, réalisées selon un plan coronal oblique joignant corps mamillaires et commissure blanche antérieure, permettent de visualiser les différents constituants du cerveau basal antérieur. La mise en évidence des noyaux septaux et des piliers antérieurs du fornix souligne, l'intérêt de ce plan pour l'exploration des troubles comportementaux et des syndromes amnésiques.
    Notes: Summary MRI sections of the brain in the coronal plane through the line joining the anterior commissure and the mamillary bodies display the constituent parts of the basal forebrain. The visualisation of the septal nuclei and the anterior columns of the fornix show the importance of this plane in the study of behaviour disorders and amnesic syndromes.
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  • 4
    ISSN: 1437-2320
    Keywords: Intramedullary tumors ; laser surgery ; MRI ; ultrasound tumor aspirator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract From February 1987 to July 1988, 16 patients of our clinic with intramedullary tumors (seven astrocytomas, six ependymomas, two angiomas with intramedullary hematomyelia, and one angioblastoma of the medulla oblongata) underwent surgery. Radical excision was possible in six cases with tumors in the cervical and/or thoracic region as well as in two cases with tumors in the medulla oblongata. In the group of patients with cervical and/or thoracic tumors, seven showed improvement, up to complete remission of the neurological symptoms. From eight patients with tumors of the medulla oblongata, one patient showed an invasive tumor of the medulla oblongata and pons with corresponding extensive neurological deficits, and died six weeks after surgery. The neurologic symptoms of the other seven patients improved after a postoperative interval of at least six weeks. The surgical approach to tumors of the medulla oblongata or spinal cord was performed by midline incision. Occasionally, a dorsal root entry zone (DREZ) incision was used when the tumor showed strictly unilateral localization. Tumors of the rhomboid fossa were approached by a lateral incision to avoid damage to nuclear structures. The more rostral the tumor localization (medulla oblongata, pons), the less complete was the surgery: only one ependymoma of the medulla oblongata was accessible to total extirpation. The tumor dignity worsened with ascending level of tumor localization. As described generally in the literature, neurological deficits of those patients with tumors in the medulla oblongata increased in the first few postoperative weeks before they began to improve. Chemotherapy, radiation therapy or decompressive laminectomy by themselves only lead to an improvement and are, therefore, not recommended.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 104 (1990), S. 151-155 
    ISSN: 0942-0940
    Keywords: Neuroepithelial cyst ; colloid cyst ; lateral ventricle ; CT ; MRI ; stereotactic puncture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This case report describes a patient presenting with symptoms of increased intracranial pressure, whose computerized tomographic (CT) scan was highly suggestive of a large low-grade glioma invading the basal ganglia. Magnetic resonance imaging (MRI) revealed a well-demarcated space-occupying mass of increased intensity in the left lateral ventricle and adjacent white matter. Following stereotactic biopsy, which yielded a homogeneous jelly-like material, the mass was removed microsurgically and was found to be most like a colloid cyst on histological examination. Discussion focusses on the clinical and differential diagnostic implications of this very unusual combination of findings.
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  • 6
    ISSN: 0942-0940
    Keywords: Lhermitte-Duclos disease ; gangliocytoma ; hamartoma ; cerebellum ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors report the third published case of a Lhermitte-Duclos disease diagnosed preoperatively with the help of MRI, stressing its possible extension beyond the limits of the posterior fossa. The pertinent literature is reviewed concerning the clinical and radiological picture of this disease, as well as the different pathogenic hypothesis.
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  • 7
    ISSN: 0942-0940
    Keywords: Recurrent lumbar disc herniation ; MRI ; CT ; myelography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thirteen patients with recurrent symptoms after lumbar discectomy were evaluated. All the patients were enrolled in the study on the basis of clinical symptoms and signs only. The patients were examined with MRI, CT, and myelography in order to compare a) the clinical findings with the imaging investigations, b) the predictive value of the different investigations, and c) the clinical and investigative results with the operative findings. All patients were operated upon according to the clinical findings, and the surgical results were used as the final diagnosis. In six patients a new disc herniation was detected. In the remaining cases surgery revealed either scar tissue or nothing to explain the recurrence of the symptoms. The three imaging modalities were analysed by receiver operating characteristic (ROC) curves. The areas under the ROC curves were 0.68 for MRI, 0.83 for CT, and 0.43 for myelography. The difference in areas between CT and myelography was significant (p〈0.05). The results indicate that CT has the highest predictive value for demonstrating the recurrence of a lumbar disc herniation.
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  • 8
    ISSN: 1432-1106
    Keywords: MEG ; MRI ; Localization methods ; P100-P200 ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of this study was to compare the relative efficacy of two methods in assessing the location of the sources of the N100 and P200 components of evoked magnetic fields (EMFs) to transient tone stimuli. EMFs to left ear stimulation, containing both components, were recorded over the right hemisphere of six normal subjects. The magnetic scalp distributions calculated at several adjacent time points, covering the duration of each component's peak, were used to estimate the source parameters of each component. Good estimates of the source of both components were obtained from all magnetic field distributions. The averaged spatial parameters derived from all distributions of each component as well as the parameters derived from the distribution that gave the best source estimate for each component were projected onto magnetic resonance images of subject's head. It was found that the source of each component is located on the superior surface of the temporal lobe and that the source of the P200 component is anterior to the N100 source in all subjects using both procedures.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 31 (1990), S. 476-482 
    ISSN: 1432-1920
    Keywords: Cavernomas ; Venous angioma ; Cerebral hemorrhage ; Angiography ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors report a series of 16 patients with venous anomalies or abnormalities of the posterior fossa studied by angiography, CT and/or MRI. We believe that so-called venous angiomas are extreme anatomic variants that drain normal territories, and we prefer to call them developmental venous anomalies (DVAs). Posterior fossa DVAs, like the supratentorial ones are classified according to their drainage into deep and superficial types. They are exclusively located in the cerebellum or tectum. In 4 cases DNA was an incidental finding; in 3 an associated cerebral venous malformation (CVM) was found and felt to be the cause of the symptoms; and only in one (with trigeminal pain) was a link between both suspected. Cavernous venous malformations (CVMs) were found in frequent association with DVA (27%). Four cases were single and 2 multiple. Five CVMs were located in the brain stem and 3 in the cerebellum. The clinical and radiological files were reviewed and a direct relationship between symptoms and localization was found in all patients with CVM. In 2 cases venous dysplasia was found: 1 Sturge-Weber and 1 first branchial arch syndrome. Both posterior fossa venous abnormalities were incidental findings.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 32 (1990), S. 247-249 
    ISSN: 1432-1920
    Keywords: Craniopharyngioma ; Third ventricle ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of a craniopharyngioma confined entirely to the third ventricle is reported. MRI revealed an isointense and high signal lesion on T1- and T2-weighted images, respectively, with homogeneous enhancement by Gd-DTPA. The tumor was reduced by 90% in 4 months after 60 Gy radiation therapy. Intraventricular craniopharyngioma is unusual and is not associated with tumoral calcification or cyst formation.
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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 32 (1990), S. 187-190 
    ISSN: 1432-1920
    Keywords: Spastic diplegia ; Periventricular leukomalacia ; MRI ; Preterm infant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Eighteen children (eleven preterm birth and seven term birth) with clinical evidence of spastic diplegia (SD) were studied to clarify the differences of the lesions between preterm and term SD on MR imaging. All with preterm birth showed similar abnormalities of the periventricular white matter represented by high intensity in T2-weighted imaging and low intensity in T1 imaging. It seemed that the lesions were periventricular leukomalacia (PVL) and dysmyelination pathologically and correlated well clinically with spastic diplegia. SD with term birth group showed various lesions, two brain anomalies (schizencephaly and corpocephaly), one PVL, four showed no lesions. We suggested that SD with preterm birth is not only a clinical but also a pathological entity.
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 32 (1990), S. 392-398 
    ISSN: 1432-1920
    Keywords: Perfusion ; Diffusion ; MRI ; Brain studies ; Anisotropic diffusion ; Brain ; White matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The use of magnetic resonance imaging to detect normal and pathological problems of perfusion and diffusion is reviewed. Motion sensitised spin-echo images can be used to detect changes in slow flow velocity within a voxel (intravoxel coherent motion (IVCM) as well as intravoxel incoherent motion (IVIM) effects attributable to both diffusion and perfusion. Changes have been identified in a variety of brain diseases in the absence of changes in conventional images but the techniques are very vulnerable to motion artefact of all types. More rapid and more sensitive approaches using steady state free precision and echo-planer imaging are being investigated. Anisotropic diffusion imaging enables white matter tracts to be demonstrated within the brain and spinal cord as a function of their direction because diffusion of water across axons is much more restricted than it is along them. This technique provides a unique method for localisation of lesions and displays obvious changes in disease in which diffusion becomes less restricted.
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  • 13
    ISSN: 1432-1920
    Keywords: Transcranial Doppler sonography ; Duplex scanning ; Arterio-venous malformation ; Real-time sonography ; Transcranial color-coded sonography ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Transcranial color-coded real-time sonography (TCCS) is a new diagnostic method allowing the non-invasive imaging of parenchymal and vascular structures of the adult brain through the intact skull. A description of the sonographic findings in two patients presenting with a radiologically ascertained arterio-venous malformation is provided. The AVM's can be depicted in the two-dimensional B-mode image as echodense areas interspersed with zones of lower echodensity. Their extension correlated with corresponding MRI images. The color-coded illustration of intravascular flow phenomena allowed the distinct identification of the major afferent feeding vessels, the venous drainage and of the vascular convolution of both AVM's. Information on hemodynamics, as e.g. the blood supply of the angioma by the contralateral internal carotid artery, are obtained by color-coded identification of intravascular flow direction including analysis of the Doppler frequency spectrrum. All findings obtained by TCCS complied with those established by angiography. We conclude, that TCCS is a suitable method for early diagnosis and long term follow up of cerebral AVM's.
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  • 14
    ISSN: 1432-1920
    Keywords: Brain infarctions ; Sickle cell disease ; Cerebral blood flow ; Xenon-CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cerebral blood flow (CBF) of 25 patients with sickle cell cerebrovascular disease (SCCVD) was examined using a Xenon-CT flow mapping method. Brain CT and MR findings were correlated with those of the Xenon-CT flow studies. CBF defects on Xenon-CT correlated reasonably well with the areas of cortical infarctions on the MR images, but in 27% of the cases, flow defects were slightly larger than the areas of infarctions on the MR images. In deep watershed or basal ganglia infarctions, abnormal CBF was noted about the cerebral cortex near infarctions in 72% of the patients, regardless of infarction sizes on the MR images. However, decreased CBF was recognized in 4 of the 9 children whose MR images were virtually normal. Thus, the extent of flow depletion cannot be predicted accurately by MR imaging alone. Xenon-CT flow mapping proved a safe and reliable procedure for evaluation of the CBF of patients with SCCVD. Although this study is preliminary, it may have a potential in selecting patients for hypertransfusion therapy, as a noninvasive test and for following children with SCCVD during their therapy. Careful correlation of results of CBF with those of MR imaging or of CT is important for objective interpretations of flow mapping images.
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  • 15
    ISSN: 1432-1920
    Keywords: Hunter's syndrome ; Mucopolysaccharidosis ; MRI ; CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Neuroradiological findings in a 44-year-old male with the typical mild type of Hunter's disease are reported. Cranial MRI revealed patchy areas of increased and decreased signals in T1- and T2-weighted images in the thalamus and the basal ganglia giving rise to a honey comb-like appearance as a whole. The deep white matter showed high signals in the T2-weighted image. To our knowledge, the honey comb-like appearance has never been reported in this disorder. Deposition of mucopolysaccharides and/or glycolipids and increase in fluid content seem to be responsible for these changes.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 32 (1990), S. 421-438 
    ISSN: 1432-1920
    Keywords: MRI ; Contrast enhancement ; Head ; Spine ; Brain ; Spinal cord
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Contrast enhancement has now become an interal part of MR imaging. In this paper, the current uses of contrast agents in MR imaging of both the head and spine are reviewed. In addition, new applications of contrast in MR imaging, including some more current and controversial, are also explored.
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 32 (1990), S. 485-487 
    ISSN: 1432-1920
    Keywords: MRI ; Brain ; Sella turcica ; Mucolipidoses ; Mannosidosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary MR findings are reported in three patients presenting mannosidosis. Among a family of 8 children, 4 presented typical clinical and biological abnormalities related to mannosidosis. Brain MR examinations including sagittal T1 and axial T2 sections were obtained in three patients of this family (one 25-year-old male, one 34-year-old female, and one 35-year-old female). MR scans demonstrate seven types of modifications: (1) brachycephaly, (2) thick calvaria, (3) verticalization of the chiasmatic sulcus, (4) poor pneumatization of the sphenoid body, (5) partial empty sella turcica (6) cerebellar atrophy, and (7) white matter signal modifications. High signal abnormalities involving the parieto-occipital white matter are identified on axial T2-weighted scans in the three patients and are probably related to demyelination and associated gliosis as described previously by several authors on specimens.
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  • 18
    ISSN: 1432-1920
    Keywords: Mitochondrial encephalomyopathy ; CT ; MRI ; SPECT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of mitochondrial encephalomyopathy (MELAS) with mental disorder is reported. The SPECT study using123I-iodoamphetamine (IMP) and MRI study revealed abnormality in the left parieto-occipital areas without abnormality in the brain CT or brain scintigram. These findings suggest a localized dysfunction of the brain capillary endothelium in association with the cerebral involvement of mitochondrial encephalomyopathy.
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 32 (1990), S. 117-123 
    ISSN: 1432-1920
    Keywords: Myelopathy ; Cervical spinal cord ; Spinal stenosis ; Myelo-CT ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 34 patients suffering from cervical spondylotic myelopathy confirmed by myelography were examined by delayed CT 6–10 h after myelography. Twelve patients showed bilateral intramedullary collections of contrast medium, predominantly cranial to the stenosis. In these patients males predominated, the duration of clinical symptoms lasted longer although their age was lower. There was no correlation to the degree and the extension of the narrowing of the cervical spinal canal. Half of 20 patients undergoing consecutive decompressive surgery showed intramedullary contrast enhancement, and this was shown again by postoperative MRI in eight. The postoperative clinical and neurophysiological results revealed no change in the majority of patients, but three patients showing intramedullary contrast medium deteriorated in neurophysiological outcome, while only one of the patients in whom intramedullary contrast medium was not noticed got worse.
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  • 20
    ISSN: 1432-1920
    Keywords: Cerebral infarction ; CT ; MRI ; 31P spectroscopy ; 31P spectroscopic imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Recent advances in magnetic resonance spectroscopy permit noninvasive study of brain metabolism in vivo,31P spectroscopic imaging being the method for evaluation of localized phosphorous metabolism. Experimentally, an ischemic-hypoxic brain insult is characterized by depletion of high energy metabolites. These changes are seen immediately after an ischemic insult. We had the opportunity of carrying out31P spectroscopic imaging of hyperacute cerebral infarction, while MRI and CT were negative. Cerebral infarction of the middle cerebral artery territory was suggested by31P spectroscopic imaging, which was closely consistent with a later-developing region of low density on CT. In cerebral infarction, early detection of the lesion is a useful pointer to the patient's prognosis, making31P spectroscopic imaging a potential tool.
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  • 21
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 32 (1990), S. 211-214 
    ISSN: 1432-1920
    Keywords: Wilson's disease ; MRI ; Neurologic symptoms ; Duration of disease ; D-penicillamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thirty-eight patients with biochemically proven Wilson's disease underwent magnetic resonanceimaging (MRI) of the brain as well as neurological examinations. The patients were scanned using spin-echo (SE) sequences; the neurologist was looking for typical symptoms: dysarthria, tremor, ataxia, rigidity/bradykinesia and chorea/dystonia. Pathological MR findings believed secondary to this uncommon inherited disorder of copper metabolism were found in twenty-two subjects. Focal abnormalities were seen in the lenticular, thalamic and caudate nuclei as well as in brain stem and white matter; these lesions were best demonstrated on T2-weighted sequences as hyperintense areas. In eight patients we found diffuse brain atrophy with consecutive widening of the ventricular system. Five subjects showed mild, nineteen severe neurologic deficits. Generally there was no correlation between MR findings and clinical neurological symptoms; the impairment of cell-metabolism causing functional alterations of the brain precedes morphological changes. During treatment with the copper chelator D-penicillamine there seemed to be a phased course of disease. Shortening of T1-relaxation due to paramagnetic influence of copper was not seen; a possible explanation could be intracellular deposition — a proton-electron-dipolar-dipolar-interaction would therefor be impossible.
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  • 22
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 32 (1990), S. 399-406 
    ISSN: 1432-1920
    Keywords: MRI ; Phase imaging ; CSF flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Motion of the cerebrospinal fluid (CSF) in and around the brain and spinal cord was examined in healthy subjects and in a number of patients with abnormalities of the CSF circulation. The pulsatile motion of the CSF was determined by spin echo phase (velocity) imaging, sometimes in combination with gradient echo phase contrast cine. Differences in flow patterns across CSF spaces were observed: flow reversal in the cerebellomedullary cistern and lumbar area relative to cervical CSF, and in the posterior versus the anterior subarachnoid space in the spinal canal. Flow communication was demonstrated in known communicating cysts or cavities. Differences in flow were also noted across spinal narrowing or block, and across the walls of a variety of cystic lesions in the brain and spinal cord. MR phase imaging of CSF flow provides pathophysiological information of potential clinical importance for the assessment of diseases affecting the CSF circulation.
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  • 23
    ISSN: 1432-1920
    Keywords: Anoxic encephalopathy ; Cortical laminar necrosis ; Delayed-onset progressive white matter lesion ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We performed serial radiological examinations on a patient with anoxic encephalopathy. In the early term after the anoxic insult, T1-weighted MRI revealed high signal intensity areas distributed laminarly in the cerebral cortex and diffusely in the putamen, which were thought to refect the cortical necrosis and necrosis in the putamen. Single photon emission computed tomography using I-123 isopropylamphetamine showed persistent hypoperfusion in the arterial watershed zones. T2-weighted MRI performed several months after the anoxic episode revealed diffuse high-intensity lesions in the arterial water-shed zones. These delayed-onset white matter lesions continued to extend over several months.
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  • 24
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 32 (1990), S. 244-246 
    ISSN: 1432-1920
    Keywords: Vagus-neurinoma ; Jugular foramen ; CT ; MRI ; Digital subtraction angiography (DSA)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The complementary predications of modern imaging techniques, CT, MRI and intraarterial digital subtraction angiography (i.a. DSA), in the differential diagnosis of a neurinoma of the jugular foramen are described.
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  • 25
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 19 (1990), S. 259-262 
    ISSN: 1432-2161
    Keywords: Extremities ; amputation ; Extremities ; MRI ; Neuroma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Magnetic resonance imaging of 24 symptomatic lower limb amputations revealed that postamputation neuromas were easily diagnosed in above-the-knee amputees. Visualization of nerve trunks in below-the-knee amputees was difficult due to greater compactness of calf muscles. Neuromas on magnetic resonance imaging appeared ovoid or rounded and were usually heterogeneous and isointense with muscle. Magnetic resonance imaging also showed additional causes of stump pain such as scar formation, fat in atrophied muscles, soft tissue abscesses, osteomyelitis, and hematomas.
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  • 26
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 19 (1990), S. 283-286 
    ISSN: 1432-2161
    Keywords: Muscle pathology ; Muscle tear ; MRI ; Hemorrhage ; Hematoma ; Muscle hernia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Magnetic resonance scans were obtained on 17 patients with acute, subacute, or chronic muscle tears. These patients presented with complaints of persistent pain or a palpable mass. Magnetic resonance findings were characterized according to alterations in muscle shape and the presence of abnormal high signal within the injured muscle. These areas of high signal were noted on both T1-weighted and T2-weighted scans and were presumed to represent areas of intramuscular hemorrhage.
    Type of Medium: Electronic Resource
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  • 27
    ISSN: 1432-2161
    Keywords: Rheumatoid arthritis ; MRI ; Cervical spine ; Atlantoaxial subluxation ; Compression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The cervical spine is the second most common location for manifestation of rheumatoid arthritis (RA). Symptoms are typically related to involvement of the craniocervical junction. Unfortunately, conventional radiographic examination is often unable to demonstrate that RA is the cause of such symptoms. Magnetic resonance imaging (MRI) provides an unique opportunity to visualize nerves, connective tissue, and bone in all planes without the use of contrast agents. These features suggest that MRI could provide important information related to RA of the cervical spine. The possibilities and limitations of MRI were therefore evaluated in 60 patients with cervical RA. The main objective of this study was to correlate symptoms and clinical findings with MRI results to establish indications for this imaging procedure.
    Type of Medium: Electronic Resource
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  • 28
    ISSN: 1434-9949
    Keywords: MRI ; Knee ; Inflammatory Arthritis ; Arthritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Magnetic resonance imaging (MRI) permits visualization of anatomic structures not appreciated by conventional radiographic imaging and may quantify inflammatory disease and its progression with greater sensitivity than available techniques. We therefore compared MRIwith clinical evaluation and with radiographic examination of 17 patients with inflammatory arthritis of the knee. We sought to determine anatomic integrity of bone, cartilage, menisci, and ligaments, and to quantify joint effusion and synovial proliferation. Patients studied had rheumatoid arthritis (10patients), juvenile rheumatoid arthritis (4patients), ankylosing spondylitis (1 patient), and monoarticular arthritis (2 patients). In all patients MRI revealed clinically important abnormalities not detected by physical or conventional radiographic exams. These included proliferative synovitis (13 patients), cartilage thinning (2 patients), cartilage erosion (8 patients), bone infarction (1 patient), meniscal injury (1 patient), and synovial invagination into bone (1 patient). Also MRI indicated inflammatory disease to be quantitatively greater than had been appreciated on clinical examination or routine X-ray studies-proliferative synovitis (12 patients), erosion (7 patients), effusion (8 patients), cartilage thinning (11 patients), and ligamentous/meniscal damage (1 patient). These findings led to reassessment of anatomic staging and influenced therapeutic decision for these patients. Thus MRI provides clinically important information about joint integrity and inflammatory disease, with a sensitivity and resolution considerably beyond conventional techniques.
    Type of Medium: Electronic Resource
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  • 29
    ISSN: 1573-6792
    Keywords: EEG ; EP ; MRI ; Functional neuroanatomy ; Laplacian derivation ; Deconvolutioin ; Dipole localization ; Topography ; Computer systems ; Signal processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A functional-anatomical brain scanner that has a temporal resolution of less than a hundred milliseconds is needed to measure the neural substrate of higher cognitive functions in healthy people and neurological and psychiatric patients. Electrophysiological techniques have the requisite temporal resolution but their potential spatial resolution has not been realized. Here we briefly review progress in increasing the spatial detail of scalp-recorded EEGs and in registering this functional information with anatomical models of a person's brain. We describe methods and systems for 124-channel EEGs and magnetic resonance image (MRI) modeling, and present first results of the integration of equivalent-dipole EEG models of somatosensory stimulation with 3-D MRI brain models.
    Type of Medium: Electronic Resource
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  • 30
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 11 (1990), S. 51-55 
    ISSN: 1590-3478
    Keywords: Crossed aphasia ; left spatial neglect ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Descriviamo il caso di una donna destrimane che, in seguito a una lesione emisferica destra, sviluppò una emiplegia sinistra e disturbi del linguaggio. La paziente presentava afasia globale ed eminattenzione spaziale sinistra. L'interesse di questo caso deriva dal fatto che è il primo caso di cosiddetta “afasia crociata” in cui l'integrità dell'emisfero sinistro è stata valutata con la Risonanza Magnetica per Immagini (MRI). La concomitanza di afasia e neglect viene brevemente discussa.
    Notes: Abstract We describe a 65-year-old right-handed (on the Edinburgh Inventory Test) woman who developed left hemiplegia and language disturbances after right hemisphere lesion. She showed global aphasia and left spatial neglect. To our knowledge, this is the first case of so called “crossed aphasia” in which the integrity of the left hemisphere is assessed by Magnetic Resonance Imaging (MRI). The association of aphasia and neglect is briefly discussed.
    Type of Medium: Electronic Resource
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  • 31
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 11 (1990), S. 289-292 
    ISSN: 1590-3478
    Keywords: Cerebral sinus thrombosis ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Viene presentato un caso di trombosi dei seni venosi provocata dai contracettivi e documentata dalla risonanza magnetica. Questa indagine si dimostra come esame fondamentale in questa patologia.
    Notes: Abstract We report the entire course of a case of thrombosis of the venous sinuses, very probably caused by contraceptive pill use, documented by MR imaging. MRI appears to be the examination of choice in such cases.
    Type of Medium: Electronic Resource
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  • 32
    ISSN: 1590-3478
    Keywords: Hematoma inferior colliculus ; trochlear nerve ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Viene descritto il caso clinico di un uomo di 57 anni giunto alla nostra osservazione per l'improvvisa comparsa di acufeni a carico dell'orecchio destro, seguiti da diplopia nello sguardo in avanti e in basso e perestesie a carico dell'emisoma destro. L'esame della motilità oculare mostrava un deficit del muscolo grande obliquo dell'occhio sinistro. La TAC e la RMN dell'encefalo evidenziavano la presenza di un'emorragia puntiforme a livello del collicolo inferiore sinistro. Il paziente venne dimesso dopo 16 giorni, mentre ancora lamentava diplopia nello sguardo in avanti e in basso; successivi controlli non evidenziarono variazioni del quadro neurologico. La localizzazione mesencefalica di un ematoma intracerebrale è un evento raro: il caso da noi descritto si distingue per l'esiguità della lesione emorragica e per il non comune tipo di deficit neurologico da essa causato.
    Notes: Abstract A 57 year old man consulted us for sudden onset of acuphenes in the right ear, followed by diplopia on forward and downward gaze and paresthesias on the right side of the body. Examination of ocular movements revealed a deficit of the superior oblique muscle of the left eye. CT and MR brainscans imaged a punctate bleed of the left inferior colliculus. The patient was discharged after 16 days still complaining of diplopia on forward and downward gaze. There was no change in neurological status at follow-up. It is rare for an intracerebral hematoma to be located in the midbrain. The case we report is distinguished by the smallness of the lesion and the uncommon neurological deficit it caused.
    Type of Medium: Electronic Resource
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  • 33
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 11 (1990), S. 297-300 
    ISSN: 1590-3478
    Keywords: Herpes zoster ophthalmicus ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Viene riportato il caso di un paziente affetto da emisindrome deficitaria associata ad herpes zoster oftalmico studiato sia con TAC dell'encefalo seriate, sia con NMR. Gli autori ipotizzano che l'esecuzione di una NMR a pazienti affetti da herpes zoster oftalmico potrebbe evidenziare piccole lesioni anche nei pazienti clinicamente non complicati da emisindrome deficitaria.
    Notes: Abstract We report the case of a patient affected by contralateral hemiplegia during herpes zoster ophthalmicus (HZO) evaluated both with serial CT scans and with MRI. We suggest that MRI examination of patients affected by HZO could be useful for the detection of early signs of cerebral arterial damage which are not yet clinically and radiologically apparent.
    Type of Medium: Electronic Resource
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