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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    World journal of urology 8 (1990), S. 143-149 
    ISSN: 1433-8726
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A digital-projection radiography system with potential applications in genitourinary imaging is presented. The system replaces the traditional film-screen combinations by storage phosphor screens but continues to use cassettes in conventional X-ray equipment. Technical features such as consistently optimal image brightness and contrast across an extremely wide exposure range and edge-enhancement capabilities overcome deficiencies seen with conventional film-screen systems, such as improper exposure and poor contrast discrimination. Images obtained with a dual-energy radiation spectrum selectively demonstrate soft-tissue- or bone-equivalent structures and diminish the obscuring effect of bowel gas. Problems resulting from the singular reliance on film as a display and storage medium in conventional radiography are resolved in digital radiography by fast and simultaneous electronic access to images that can be displayed on high-resolution monitors or laser-printed films. The basic technical features of storage-phosphor digital imaging as compared to conventional radiography are described. A summary of recently published results relevant to genitourinary examinations is given and radiographic examples are presented.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1279-8517
    Schlagwort(e): Angiography ; Technology ; Aortic arch
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Résumé A partir d'une étude anatomique de 46 spécimens, les angles du tronc artériel brachio-céphalique droit et de l'artère sous-clavière gauche par rapport à la tangente à la crosse de l'aorte sont mesurés de façon à déterminer quelle voie permet l'accès le plus facile et le plus rapide à l'aorte descendante lors des angiographies des membres inférieurs en cas d'artériopathie sévère. L'étude montre que les angles moyens (77.1±16.0 degrés pour le tronc brachio-céphalique, 77.7±16.3 degrés pour l'artère sous-clavière gauche) ne sont pas significativement différents. Comme l'abord axillaire droit comporte plus de risques qui ne peuvent être contre-balancés que par un accès plus rapide, nous concluons que chez les patients de tous âges, le côté gauche droit être la voie d'accès de première intention.
    Notizen: Summary In an anatomic study of 46 specimens, the angle of the brachiocephalic trunk and the left subclavian artery to the tangent of the aortic arch was measured in an effort to decide which route offers the quickest access to the descending aorta in lower extremity angiography for severe occlusive vascular diseases. The study shows that the average angles (77.1±16.0 degrees for the brachiocephalic trunk/77.7±16.3 degrees for the left subclavian artery) are not significantly different. Since the right axillary approach incurs other risks that could only be compensated by significantly quicker access, i.e. shorter maneuvering time in the aortic arch we conclude that in patients of all ages the left side should be the access route of choice.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    European radiology 6 (1996), S. 606-606 
    ISSN: 1432-1084
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1432-1084
    Schlagwort(e): Key words: Breast radiography ; Technology ; Breast neoplasms ; calcification ; Radiation dose
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract. The aim of our study was to evaluate a mammography unit capable of magnification of up to fourfold at an equivalent or lower dose than with current systems. A prototype mammography tube with an electron-beam-focusing technology resulting in a focal spot size of 40–120 μm was combined with a highly intensifying screen-film system. To evaluate contrast-detail resolution, phantom radiographs were performed with the prototype magnification mammography system using a magnification factor of 1.7 for survey views and a magnification factor of 4.0 for spot views. They were compared with unmagnified survey views and magnification spot views (magnification factor 1.9) of a state-of-the-art mammography system. The radiation exposure was measured and mean glandular doses were calculated. The contrast-detail resolution with both prototype (m = 1.7) and conventional (m = 1.1) survey views was equivalent while the entrance dose and the mean glandular dose were approximately 50 % lower with the prototype. For spot views, the contrast-detail resolution was substantially higher for the prototype than for conventional magnification while the dose was equivalent. Dose reduction and improved detail resolution are possible with this new technology.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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