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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 9 (1999), S. 1203-1204 
    ISSN: 1432-1084
    Keywords: Key words: Cellulosis ; Interstitial ; Tomography ; X-ray computed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Chest radiographs and high-resolution chest CT scans were performed in a 30-year-old man with a history of intravenous drug abuse and diffuse micronodular infiltrates. Transbronchial biopsy gave a diagnosis of cellulose granulomatosis of the lung. Cellulose granulomatosis should be considered in the differential diagnosis of pulmonary interstitial disease, especially in the setting of intravenous drug abuse.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Annales geophysicae 16 (1998), S. 1180-1189 
    ISSN: 0992-7689
    Keywords: Tomography ; Airglow ; Mesopause ; Gravity waves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract It is pointed out that observations of periodic nightglow structures give excellent information on atmospheric gravity waves in the mesosphere and lower thermosphere. The periods, the horizontal wavelengths and the phase speeds of the waves can be determined from airglow images and, using several cameras, the approximate altitude of the luminous layer can also be determined by triangulation. In this paper the possibility of applying tomographic methods for reconstructing the airglow structures is investigated using numerical simulations. A ground-based chain of cameras is assumed, two-dimensional airglow models in the vertical plane above the chain are constructed, and simulated data are calculated by integrating the models along a great number of rays with different elevation angles for each camera. After addition of random noise, these data are then inverted to obtain reconstructions of the models. A tomographic analysis package originally designed for satellite radiotomography is used in the inversion. The package is based on a formulation of stochastic inversion which allows the input of a priori information to the solver in terms of regularization variances. The reconstruction is carried out in two stages. In the first inversion, constant regularization variances are used within a wide altitude range. The results are used in determining the approximate altitude range of the airglow structures. Then, in the second inversion, constant non-zero regularization variances are used inside this region and zero variances outside it. With this method reliable reconstructions of the models are obtained. The number of cameras as well as their separations are varied in order to find out the limitations of the method.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Annales geophysicae 16 (1998), S. 1332-1342 
    ISSN: 0992-7689
    Keywords: Tomography ; Aurora ; EISCAT ; Ionosphere ; Conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Tomographic reconstruction of the three-dimensional auroral are emission is used to obtain vertical and horizontal distributions of the optical auroral emission. Under the given experimental conditions with a very limited angular range and a small number of observers, algebraic reconstruction methods generally yield better results than transform techniques. Different algebraic reconstruction methods are tested with an auroral are model and the best results are obtained with an iterative least-square method adapted from emission-computed tomography. The observation geometry used during a campaign in Norway in 1995 is tested with the are model and root-mean-square errors, to be expected under the given geometrical conditions, are calculated. Although optimum geometry was not used, root-mean-square errors of less than 2% for the images and of the order of 30% for the distribution could be obtained. The method is applied to images from real observations. The correspondence of original pictures and projections of the reconstructed volume is discussed, and emission profiles along magnetic field lines through the three-dimensionally reconstructed arc are calibrated into electron density profiles with additional EISCAT measurements. Including a background profile and the temporal changes of the electron density due to recombination, good agreement can be obtained between measured profiles and the time-sequence of calculated profiles. These profiles are used to estimate the conductivity distribution in the vicinity of the EISCAT site. While the radar can only probe the ionosphere along the radar beam, the three-dimensional tomography enables conductivity estimates in a large area around the radar site.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1279-8517
    Keywords: Shoulder ; Magnetic Resonance imaging ; Tomography ; X Ray computed ; Arthrography ; Labrum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The ability to detect and categorize SLAP (Superior Labrum Anterior to Posterior) lesions of the scapular labrum is of practical importance to the orthopedic surgeon and the radiologist. The aim of this study, performed on cadaveric shoulders, was to determine whether CT arthrography or MR arthrography is able to show normal anatomical variation of the glenoid labrum and detect labral abnormalities. CT arthrography, MR arthrography followed by anatomical dissection were performed on twenty three fresh frozen cadaveric shoulders and analysed by a radiologist and two orthopaedic surgeons. As Gadolinium intra-articular injection is not allowed in France, we used an iodinated contrast media for both MR arthrography and CT arthrography. In this study, the sensitivity of MR arthrography seemed higher than CT arthrography (respectively 4 and 3 labral lesions diagnosed out of five), although no significant statistical conclusions can be made due to the small number of cases. In conclusion, under such specific conditions, MR arthrography seems to be the method of choice for the detection and classification of labral lesions.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1279-8517
    Keywords: Shoulder ; Magnetic Resonance imaging ; Tomography ; X Ray computed ; Arthrography ; Labrum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La possibilité de détecter et de classer les lésions du bourrelet supérieur de la cavité glénoïdale de la scapula (SLAP lesions: Superior Bourrelet Anterior to Posterior) est une nécessité pour le radiologue et l'orthopédiste confrontés à des patients présentant des douleurs de l'épaule. Le but de cette étude réalisée sur des épaules cadavériques, était de déterminer les valeurs respectives de l'arthro-scanner et de l'arthro-IRM dans la détection des variations anatomiques normales et des anomalies pathologiques du bourrelet glénoïdal supérieur. Un arthro-scanner, une arthro-IRM, puis une dissection anatomique ont été réalisées sur 23 épaules fraîches et les résultats de ces examens ont été analysés par un radiologue et deux chirurgiens orthopédistes. L'injection intra-articulaire de gadolinium n'étant actuellement pas autorisée en France, un produit de contraste iodé à été utilisé pour l'arthro-scanner et l'arthro-IRM. Dans cette étude, la sensibilité de l'arthro-IRM semblait meilleure que celle de l'arthro-scanner (respectivement 4 et 3 lésions diagnostiquées sur 5), bien que ce résultat ne soit pas statistiquement significatif compte tenu du petit nombre de cas. En conclusion, dans les conditions spécifiques de notre étude, l'arthro-IRM semble être la méthode de choix pour la détection et la classification des lésions du bourrelet glénoïdal supérieur.
    Notes: Summary The ability to detect and categorize SLAP (Superior Labrum Anterior to Posterior) lesions of the scapular labrum is of practical importance to the orthopedic surgeon and the radiologist. The aim of this study, performed on cadaveric shoulders, was to determine whether CT arthrography or MR arthrography is able to show normal anatomical variation of the glenoid labrum and detect labral abnormalities. CT arthrography, MR arthrography followed by anatomical dissection were performed on twenty three fresh frozen cadaveric shoulders and analysed by a radiologist and two orthopaedic surgeons. As Gadolinium intra-articular injection is not allowed in France, we used an iodinated contrast media for both MR arthrography and CT arthrography. In this study, the sensitivity of MR arthrography seemed higher than CT arthrography (respectively 4 and 3 labral lesions diagnosed out of five), although no significant statistical conclusions can be made due to the small number of cases. In conclusion, under such specific conditions, MR arthrography seems to be the method of choice for the detection and classification of labral lesions.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0789
    Keywords: Key words Earthworm burrow system ; Seasonal variation ; 3D skeleton ; Tomography ; Image analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Four soil cores (length, 20 cm; diameter, 16 cm) were sampled in a Swiss pre-Alpine meadow with high earthworm abundance (〉400 individuals/m2); two cores were taken in October 1993 and the other two cores in April 1994. The cores were described using computer assisted tomography which gives a series of section images every 3 mm. A method for reconstructing the three-dimensional (3D) skeleton of the earthworm burrow system is presented and discussed. This method provides an image of the structural organisation of the burrow system and was found to be adequately sensitive for use in ecological and functional studies. The seasonal variation of these 3D skeletons was investigated using two approaches, i.e. the analysis of: (1) global burrow system characteristics, and (2) individual burrow characteristics. At the scale of the global burrow system no difference was found between seasons (same number of burrows and same total burrow length) except for the vertical segment distribution, which was homogeneous in spring and decreased with depth in the fall. The study of individual burrow characteristics revealed that burrows tended to be more vertical in spring and that their branching intensity was higher in this season.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-2161
    Keywords: Key words Tomography ; X-ray computed ; Fractures ; MRI ; Pelvis ; fractures ; Pelvis ; radionuclide studies ; Radiation ; injurious effects ; complications of ; Therapeutic radiology ; Tomography ; positron emission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Pelvic bone injuries are infrequent complications of radiotherapy. However, insufficiency fractures in irradiated pelvic bones may be underdetected, particularly in postmenopausal women. We describe the clinical presentation, radiologic evaluation, and course of disease in three patients with postradiation pelvic insufficiency fractures. Differential diagnosis included metastatic disease, tumor recurrence, and second malignancy. Recognition of radiographic features may prevent unnecessary, possibly morbid treatments.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 26 (1997), S. 386-397 
    ISSN: 1432-2161
    Keywords: Key words Hip dislocation ; congenital ; Diagnostic imaging ; Tomography ; X-ray computed ; Magnetic resonance imaging ; Radiography ; Arthrography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Developmental dysplasia of the hip (DDH) has a broad spectrum of presentation with the minor findings resolving spontaneously and the most severe ones resulting in disability, if not diagnosed early in life. Diagnosis in the first few months of life allows conservative treatment with complete resolution in most cases. Suspicion of DDH is based on ethnic, family, and pregnancy history, and on physical examination of the newborn. Imaging assists in the diagnosis and follows the treatment. Different modalities have their own advantages and disadvantages. This article deals with the description of the disease, risk factors, statistics, the physical examination as applied to real-time sonography, and imaging (plain radiography, arthrography, computed tomography, and magnetic resonance imaging).
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Geometriae dedicata 66 (1997), S. 357-368 
    ISSN: 1572-9168
    Keywords: Tomography ; convex sets ; X-ray ; chord function.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A method for the reconstruction of boundary points of convex sets is provided starting from three X-ray pictures in two orthogonal directions and from a point.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 36 (1996), S. 175-180 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Geschichte ; HNO-Radiologie ; Tomographie ; Computertomographie ; Magnetresonanztomographie ; Key words History ; Head and neck radiology ; Tomography ; Computer tomography ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The head and neck region is a limited anatomical area in radiological diagnostics. Nevertheless, head and neck radiology has a long and interesting history with excellent scientists involved in its development. Before the discovery of X-rays, no information about the head and neck could be obtained without surgery or even autopsy. Therefore, conventional radiograms and special projections were an important step forward. During the 1950s, a second diagnostic breakthrough was achieved by the introduction of tomographic techniques. Film tomography was the first step in this important development. Computed tomography and magnetic resonance imaging yielded astonishing and unforeseen results. Especially in the field of magnetic resonance imaging, the techniqual development has not yet come to an end. Scientific research and continuing education are required in order to achieve further advances in head and neck radiology, and European cooperation is on the way.
    Notes: Zusammenfassung Der Kopf-Hals-Bereich ist im Vergleich zu den anderen Regionen der radiologischen Diagnostik ein begrenztes Gebiet. Trotzdem hat die Kopf-Hals-Radiologie eine lange, interessante und von hervorragenden medizinischen Persönlichkeiten geprägte Geschichte. Wenn man berücksichtigt, daß vor der Entdeckung der Röntgenstrahlen Einblicke in das Schädelinnere und die Halsstrukturen ohne Sektion oder Operation überhaupt nicht möglich waren, bedeutete bereits die Einführung der Summationsaufnahmen und die Erarbeitung von Spezialprojektionen ein entscheidender Schritt. Ein zweiter diagnostischer Durchbruch erfolgte in den 50er Jahren dieses Jahrhunderts durch die Entwicklung der Schnittbildverfahren. Diese führten zunächst als konventionelle Tomographie, dann als Computertomographie und Magnetresonanztomographie zu erstaunlichen und unerwarteten Ergebnissen. Im MRT-Bereich ist diese Entwicklung noch nicht abgeschlossen. Intensivere medizinisch-wissenschaftliche Arbeit und gezieltere Fortbildung, auch in europäischem Rahmen, erscheinen erforderlich, um dieser Entwicklung gerade im Spezialbereich Kopf und Hals gerecht zu werden.
    Type of Medium: Electronic Resource
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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Urological research 24 (1996), S. 149-160 
    ISSN: 1434-0879
    Keywords: Regional renal blood flow ; Microsphere technique ; Tomography ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Variations in regional renal blood flow have been implicated in a variety of disease states. Many techniques have been developed in an attempt to accurately assess these changes. The microsphere technique is the most widely used method at the present time. This technique allows focal measurements to be performed, but there is a conflict between the resolution of the method and the number of microspheres necessary in each sample. New imaging techniques such as tomography and autoradiography enable visual assessment of renal blood flow. Though there is no ideal method, these techniques have opended up new possibilities in the quantification of regional renal blood flow.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Surveys in geophysics 17 (1996), S. 517-556 
    ISSN: 1573-0956
    Keywords: Borehole ; Logging ; Resistivity ; Electrical ; Electromagnetic ; Spontaneous Potential ; Radar ; Tomography ; History
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Electrical and electromagnetic geophysical techniques have reached a high level of technological sophistication since they were first used in boreholes less than one hundred years ago. Borehole logging-the detailed determination of rock and fluid properties adjacent to the borehole, and borehole geophysics-extending the range of geophysical investigation large distances away from the borehole, are essential for exploration, assessment and production of earth resources, as well as for fundamental studies of the earth. Borehole electrical and electromagnetic methods incorporate 17 decades of the electromagnetic spectrum, from 1000-s geomagnetic studies, through resistivity and permittivity measurements, to high-resolution resistivity imaging, NMR and optical spectroscopy.
    Type of Medium: Electronic Resource
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  • 13
    ISSN: 1432-1084
    Keywords: Digital radiography ; Image processing ; Subtraction ; Thorax ; Tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Digital tomosynthesis makes it possible to reconstruct multiple tomographs from digital data obtained during a single tomographic motion and permits digital processing, which adds a number of special advantages to the well-known advantages of conventional tomography. We performed digital tomosynthesis with a fluororadiographic TV unit with tomographic function which was capable of producing pulsed low-and high-energy X-rays alternately, and we studied digital image processing to improve the image clarity of the reconstructed tomographs. To identify the optimal parameters for processing image data by means of spatial frequency filtration we evaluated the spatial frequency distribution of image data in linear tomographs of the lung, and on the basis of the results of this study we developed several types of digital image processing to reduce tomographic blur and system noise, to improve visualisation of faint opacities, to reduce resistant tomographic blur as well as overall blur, and to generate low-noise bone images based on dual-energy subtraction tomosynthesis.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Clinical rheumatology 14 (1995), S. 633-640 
    ISSN: 1434-9949
    Keywords: Scleroderma ; Lung Fibrosis ; High Resolution Computed ; Tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The aim of the study was to investigate the pulmonary parenchymal abnormalities by high resolution computed tomography (HRCT) in patients with various forms of scleroderma. Three scans were performed sequentially in all cases: one at the level of aortic arch, one at the tracheal carina and one 1–2 cm above the diaphragm. Seventy cases with limited, 21 patients with diffuse cutaneous systemic sclerosis and 10 cases with circumscribed scleroderma were investigated. The 21 patients with diffuse scleroderma included three normal HRCT scan (14%), three with ground glass attenuation (14%), one with ground glass attenuation with fibrosis, three with fibrosis (14%), six with subpleural and five with diffuse honeycombing. The majority of cases with extensive honeycombing of the lungs had anti-Scl 70 autoantibody which was the characteristic antibody of the diffuse scleroderma subset. The 70 cases with limited cutaneous systemic sclerosis were characterized by normal HRCT (43%), ground glass opacity with or without fibrosis (18.6%), whereas fibrosis was detected in 22.9%, subpleural or diffuse honeycombing in 15.7% of the patients. Six of the ten cases with circumscribed scleroderma also showed a fibrosis. Cases with diffuse scleroderma are characterized by the presence of advanced fibrosis, whereas the extent of fibrosis is far less pronounced in limited scleroderma. Mild fibrosis may also be present in circumscribed scleroderma forms.
    Type of Medium: Electronic Resource
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