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  • Key words Computed tomography  (2)
  • Magnification radiography  (2)
  • 1
    ISSN: 1432-2161
    Keywords: Key words Bone neoplasms ; diagnosis ; Magnification radiography ; Bones ; radiography ; Radiography ; comparative studies ; Radiography ; technology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. To evaluate the potentials of magnification radiography as compared with conventional radiography in diagnosing bone tumors. Design and patients. Sixty-two patients with primary bone tumors and tumorlike lesions underwent radiography with both conventional (non-magnified) and magnification (fivefold) techniques. All radiographs were analyzed by four radiologists and the findings correlated with the histopathology findings. The microfocal X-ray unit used for magnification radiography had a focal spot size of 20–130 μm. Digital luminescence radiography was employed with magnification, while normal film-screen systems were used with conventional radiography. Results. The diagnosis of benign and malignant lesions as well as the individual tumor diagnosis were determined with higher accuracy using magnification compared with conventional radiography (88% vs 75% and 71% vs 52%, p〈0.01). Margins of destruction, periosteal reactions and matrix patterns were evaluated with higher certainty by all of the radiologists (p〈0.01). Conclusion. Magnification radiography may improve the evaluation and diagnosis of bone tumors.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 36 (1996), S. 172-173 
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Computertomographie ; Magnetresonanztomographie ; CD-ROM ; Interaktives Lernprogramm ; Key words Computed tomography ; Magnetic resonance tomography ; CD-ROM ; Interactive teaching file
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The Schering Atlas is a teaching file in CT and MRI anatomy designed for physicians and students. It is available on CD-ROM, shows good image quality, and is easy to use in medium-price-range personal computer systems. Because of the amount and quality of image material, the Schering Atlas's price is appropriate for institutions, but not for private users.
    Notes: Zusammenfassung Der Schering-Atlas stellt u. E. ein praxisnahes, zum Training von Studenten und Ärzten ausgezeichnet geeignetes Lernprogramm zur Schnittbildanatomie in CT und MR dar. Der Schering-Atlas beinhaltet sämtliche für den Lernenden wesentlichen anatomischen Strukturen. Verzichtet wurde im Schering-Atlas auf die Darstellung sehr kleiner und selten identifizierbarer anatomischer Strukturen, was ihn als Nachschlagewerk für den schnittbildradiologisch versierten Benutzer doch einschränkt. In der Anwendung lassen sich bezüglich Bedienbarkeit und Arbeitsgeschwindigkeit an Personalcomputern mittlerer Preisklasse keine Mängel feststellen. Der Preis des Softwarepaketes erscheint uns in Anbetracht der hohen Qualität und Vielzahl des angebotenen Bildmaterials für klinische Institutionen zwar tragbar, für viele private Anwender aber sicherlich zu hoch. Immerhin hat sich ein System wie der Schering-Atlas, auch in Anbetracht der Möglichkeit des interaktiven Trainings, letztlich zu messen an dem, was an konventioneller Literatur zu diesem Preis zur Verfügung steht.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2102
    Keywords: Schlüsselwörter Computertomographie ; Lunge ; Niedrigdosis-CT ; Strahlenexposition ; Rundherd ; Key words Computed tomography ; Lung ; Low-Dose CT ; Radiation exposure ; Pulmonary nodule
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Introduction. Computed tomography is a significant source of medical radiation exposure for populations in Europe. Reduced radiation exposure may be possible with modern CT scanners with an image quality that while less good than before remains acceptable for clinical purposes. The lung appears particularly well suited to investigation with low-dose CT owing to the high contrast between normal and diseased pulmonary parenchyma. Methods. We analysed the diagnostic accuracy of different low-dose CT protocols for the detection of pulmonary nodules using inflation-fixed isolated postmortem lung specimens in a chest phantom. In a comparative patient study diagnostic accuracies of standard-dose CT (120 kV, 250 mAs; slice thickness 10 mm, pitch 1) and low-dose CT (120 or 140 kV, 50 mAs; slice thickness 5 or 10 mm, pitch 1 or 2) were assessed. Results. Preliminary results suggest that low-dose CT protocols with radiation exposure of 10–20 % of that with standard-dose CT can reliably depict soft tissue density pulmonary nodules with a diameter of more than 5 mm and can also demonstrate smaller nodules equally well in many cases. Conclusions. Low-dose CT may frequently be an adequate imaging procedure in a given clinical setting, particularly in young patients with benign disease.
    Notes: Zusammenfassung Die Computertomographie (CT) trägt wesentlich zur medizinischen Strahlenexposition der Bevölkerung bei. Eine Reduktion dieser Strahlenexposition läßt sich vermutlich mit modernen CT-Geräten bei für viele Fragestellungen vertretbaren Einschränkungen der Bildqualität realisieren. Zur Untersuchung mittels solcher Niedrigdosis-CT (NDCT) erscheint die Lunge aufgrund der günstigen Kontrastverhältnisse des normalen und pathologischen Parenchyms besonders geeignet. Wir untersuchten die Treffsicherheit unterschiedlicher NDCT-Protokolle im Nachweis pulmonaler Rundherde an Lungenpräparaten in einem Thoraxphantom. In einer vergleichenden Patientenstudie wurde die Treffsicherheit der Spiral-CT des Thorax mit etablierten Parametern (120 kV, 250 mAs, Schichtdicke 10 mm, Pitch 1) mit derjenigen verschiedener NDCT-Protokolle (120 oder 140 kV, 50 mAs, Schichtdicke 5 oder 10 mm, Pitch 1 oder 2) verglichen. Vorläufige Ergebnisse zeigen, daß diese NDCT-Protokolle mit einer Dosis von 10 bis 20 % der Standard-Dosis CT weichteildichte Lungenrundherde mit einem Durchmesser von mehr als 5 mm zuverlässig nachweisen konnten und auch bei kleineren Rundherden häufig gleichwertig waren. Abhängig von der Fragestellung sollten derartige NDCT-Protokolle v. a. bei jungen Individuen mit benignen Erkrankungen auch in der klinischen Routine eingesetzt werden.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1084
    Keywords: Fracture healing ; Magnification radiography ; Roentgen technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of the study was to evaluate the potential of magnification radiography in diagnosing fracture healing and assessing its complications. Seventy-three patients with fractures or who had undergone osteotomy were radiographed with both conventional (non-magnified) and magnification (5-fold) techniques. Since 10 patients were radiographed twice and 1 three times, 83 radiographs using each technique were obtained. All radiographs were analysed and the findings correlated with the patients' follow-up studies. The microfocal X-ray unit used for magnification radiography had a focal spot size of 20–130 μm. As an imaging system, digital luminescence radiography was employed with magnification, while normal film-screen systems were used with conventional radiography. Manification radiography proved superior to conventional radiography in 47% of cases: endosteal and periosteal callus formations were sen earlier and better in 26 cases, and osseous union could be evaluated with greater certainty in 33 cases. In 49% of cases magnification radiography was equal and in 4% inferior to conventional radiography. Additionally an “inter-observer analysis” was carried out. Anatomical and pathological structures were classified into one of four grades. Results were significantly (P 〈 0.01) better using magnification radiography. We conclude that the magnification technique is a good method for monitoring fracture healing in its early stages.
    Type of Medium: Electronic Resource
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