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  • 2000-2004  (4)
  • 1980-1984  (3)
  • 1900-1904
  • 1890-1899
  • Tomography
  • 1
    Book
    Book
    Boston :Birkhäuser,
    Title: Sampling, wavelets, and tomography /
    Contributer: Benedetto, John , Zayed, Ahmed I.
    Publisher: Boston :Birkhäuser,
    Year of publication: 2003
    Pages: p. cm
    Series Statement: Applied and computational harmonic analysis
    ISBN: 0-8176-4304-4 , 3-7643-4304-4
    Type of Medium: Book
    Language: English
    Keywords: Hamonic analysis ; Wavelets (Mathematics) ; Fourier analysis ; Sampling (Statistics) ; Tomography
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Skeletal radiology 29 (2000), S. 409-412 
    ISSN: 1432-2161
    Keywords: Key words Tarsal bones ; abnormalities ; Tomography ; X-ray computed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To determine the findings of calcaneonavicular coalition on coronal CT. Design. We retrospectively reviewed the CT scans of 14 calcaneonavicular coalitions in eight patients. All coalitions were visible on the axial scans, and the diagnosis was confirmed by surgery in five patients. These CT scans were compared with scans of ten normal feet. Results. We identified two features of calcaneonavicular coalition on coronal CT: lateral bridging (an abnormal bony mass lateral to the head of the talus) and rounding of the talus. All eight patients demonstrated at least one of these two findings. Conclusion. Although calcaneonavicular coalition is best seen on axial CT scans of the feet, there are two abnormalities, lateral bridging and rounding of the head of the talus, which should suggest the diagnosis on coronal CT scans.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1619-7089
    Keywords: Key words: Behçet’s disease ; Tomography ; emission computed ; Acetazolamide ; Diaschisis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The purpose of this study was to characterise the nature of the baseline perfusion defects found in patients with Behçet’s disease using hexamethylpropylene amine oxime single-photon emission tomography in conjunction with acetazolamide test (Acz SPET). Eleven patients underwent both baseline and Acz SPET. Regions of interest (ROIs) were drawn on the areas with decreased perfusion (D-ROI) and, in the same section, on areas with normal perfusion (N-ROI). The ROIs were then repositioned on the corresponding section on Acz SPET. The mean ROI counts were then transformed into a perfusion index value (PIV) with reference to the global brain counts. In total we found 24 D-ROIs (17 in the cortical and 7 in subcortical grey matter). The influence of Acz infusion was selectively registered in the D-ROIs, where PIVs changed from 1.23±0.17 (baseline SPET) to 1.63±0.23 (Acz SPET) (P〈0.001). No significant difference was seen in the N-ROIs (1.46±0.21 and 1.40±0.17, respectively, on baseline SPET and Acz SPET). Our results demonstrate that Acz infusion increases the regional cerebral blood flow within baseline grey matter perfusion defects. This finding suggests that baseline perfusion abnormalities could reflect a disconnection rather than local vasculitic involvement.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1619-7089
    Keywords: Key words: Arrhythmias ; Imaging ; Tomography ; Infarct size ; Defibrillator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Infarct size as determined by perfusion imaging is an independent predictor of mortality after implantable cardioverter defibrillator (ICD) implantation in patients with coronary artery disease (CAD) and life-threatening ventricular arrhythmias (VA). However, its value as a predictor of VA recurrence and hospitalisation after ICD implantation is unknown. Therefore, the objective of this study was to evaluate whether infarct size as determined by perfusion imaging can help to identify patients who are at high risk for recurrence of VA and hospitalisation after ICD implantation.We studied 56 patients with CAD and life-threatening VA. Before ICD implantation, all patients underwent a uniform study protocol including a thallium-201 stress-redistribution perfusion study. A defect score as a measurement of infarct size was calculated using a 17-segment 5-point scoring system. Study endpoints during follow-up were documented episodes of appropriate anti-tachycardia pacing and/or shocks for VA and cardiac hospitalisation for electrical storm (defined as three or more appropriate ICD interventions within 24 h), heart failure or angina. After a mean follow-up of 470±308 days, 22 patients (39%) had recurrences of VA. In univariate analysis, predictors for recurrence were: (a) ventricular tachycardia (VT) as the initial presenting arrhythmia (86% vs 59% for patients without ICD therapy, P=0.04), (b) treatment with β-blockers (36% vs 68%, P=0.03) and (c) a defect score (DS) ≥20 (64% vs 32%, P=0.03). In multivariate analysis, VT as the presenting arrhythmia (χ2=5.51, P=0.02) and a DS ≥20 (χ2=4.22, P=0.04) remained independent predictors. Cardiac hospitalisation was more frequent in patients with a DS ≥20 (44% vs 13% for patients with DS 〈20, P=0.015) and this was particularly due to more frequent hospitalisations for electrical storm (24% vs 3% for patients with DS〈20, P=0.037). The extent of scarring determined by perfusion imaging can separate patients with CAD into high- and low-risk groups for recurrence of VA and cardiac hospitalisation after ICD implantation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 6 (1984), S. 195-201 
    ISSN: 1279-8517
    Keywords: Spinal canal ; Tomography ; X-ray ; Lumbar vertebrae ; Cauda equina ; Spinal stenosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé La gouttière radiculaire consitute la partie latérale du canal rachidien quand il est trifolié: c'est un espace ostéo-ligamentaire, monovertébral, indéformable dont les mesures sont reproductibles. Son anatomie a été étudiée sur 50 rachis lombaires entiers de sujets anatomiques et sa radio-anatomie précisée par les tomographies sagittales et par des tomographies computérisées de ces pièces anatomiques et par les tomographies sagittales de 25 individus témoins asymptomatiques. Cette gouttière, exceptionnelle dans la partie supérieure du canal lombaire, a été retrouvée dans 72% des cas en L4 et toujours en L5 et en S1. Son diamètre sagittal, qui doit être mesuré en regard du bord supérieur du pédicule, a un diamètre minimal théorique de 3 mm à 3,8 mm suivant le niveau vertébral. 13% des vertèbres étaient asymétriques, et il n'existe pas de relation significative entre le diamètre sagittal médian du canal rachidien et les diamètres des gouttières radiculaires. La tomographie sagittale conventionnelle donne deux types d'images suivant l'évasement de cette gouttière et fournit les meilleures mesures (92% de mesures concordantes), si sa technique est rigoureuse. La tomographie computérisée transversale est moins fiable car le positionnement du plan de coupe reste la première cause d'erreur dans les mesures, mais elle permet de préciser les rapports des éléments nerveux avec cette gouttière. Cette sémiologie radio anatomique s'appliquera à la reconstruction sagittale par tomographie computérisée quand cet examen donnera des images osseuses aussi fines que la tomographie conventionnelle.
    Notes: Summary The radicular canal is the lateral portion of the spinal canal when it is trefoil. It is a bony and ligamentary, monovertebral and indeformable space, the measurements of which are reproducible. The anatomy of this radicular canal has been studied in the whole of the lumbar vertebrae of 50 anatomical subjects. Its radiological anatomy has been defined by sagittal and computerised tomographies of these anatomical specimens, while sagittal tomographies were done for 25 control individuals devoid of symptoms. This canal, exceptional in the upper part of the lumbar canal, has been found in 72% of the cases in L4 and always in L5 and Sl. Its sagittal diameter, which when measured must take into account the upper margin of the pedicle, has a theoretical minimal diameter of 3 mm to 3.8 mm, according to the vertebral level. 13% of the vertebrae were asymmetrical and no significant relationship exists between the median sagittal diameter of the spinal canal and the diameters of the radicular canals. Conventional sagittal tomography provides two types of images, according to the shape of the mouth of this canal and furnishes the best measurements (92% of the measurements were concordant), as long as the technique is followed closely. Transverse computerised tomography is less reliable, for the positioning of the section plane still remains the principal cause for error in measuring, but it provides a definition of the relations of the nerve elements with this canal. This radiological study will be suitable for sagittal reconstruction by computerised tomography, once this kind of examination can produce pictures of bones as detailed as those of conventional tomography.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Surgical and radiologic anatomy 4 (1982), S. 93-100 
    ISSN: 1279-8517
    Keywords: Adenal gland ; Tomography ; Radioanatomy ; Computed tomography ; Ultrasound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé A partir de coupes anatomiques de référence, effectuées dans les plans horizontal, frontal et sagittal, sont définies les données morphologiques et topographiques nécessaires à la construction et à l'interprétation des tomogrammes surrénaliens en radiologie conventionnelle, en tomodensitométrie et en échographie. La situation relativement ventrale de la surrénale gauche, la position plus élevée de la droite et le décalage cranio-caudal des deux glandes sont les prinicpales causes d'une exploration incomplète. Le rachis, l'aorte et la veine cave inférieure sont des meilleurs repères que les pôles supérieurs des deux reins. Les rapports étroits de la glande gauche avec le pancréas et la rate expliquent la fréquence des confusions entre ces structures. L'interprétation ne doit porter que sur les tomogrammes de morphologie triangulaire ou lambdatique dont le caractère rectiligne ou concave des bords peut être retenu comme critère de normalité. Les dimensions varient selon l'orientation des glandes mais sont en règle supérieures à gauche.
    Notes: Summary The morphological and topographic data necessary to obtain and analyse tomograms of the suprarenal glands by conventional radiology, computed tomography and ultrasound, were derived from serial anatomical cuts made in the horizontal, frontal and sagittal planes. The results suggest that the chief reasons for an incomplete examination of the glands are the relatively ventral location of the left adrenal gland and the somewhat higher position of the right gland. The spine, aorta and inferior vena cava provide better landmarks than the upper poles of the kidneys. The close relationships between the left adrenal gland, pancreas and the spleen are a major source of confusion and account for frequent mistakes in identification of the suprarenals. Proper interpretation can only be made from images which are triangular or lambda-like in appearance, although straight or even concave outlines may be considered as normal. The dimensions of the suprarenal glands depends upon their position but the left is usually larger than the right.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 19 (1980), S. 113-117 
    ISSN: 1432-1920
    Keywords: Tomosynthesis ; Flashing tomosynthesis ; Tomography ; Serial tomography ; Autotomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A new tomographic method called tomosynthesis and its first clinical results are presented. The method is based on classical tomography. All information necessary for the tomography of an object is obtained in one procedure without moving the X-ray tube, the film, or the object. Thus the investigation requires only a few seconds.
    Type of Medium: Electronic Resource
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