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  • Joint Kinematics  (1)
  • Key words CT-angiography (CTA) • MR-angiography (MRA) • Digital subtraction angiography (DSA) • Intracranial aneurysms • Volume rendering technique (VRT)  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Der Radiologe 37 (1997), S. 905-912 
    ISSN: 1432-2102
    Keywords: Key words CT-angiography (CTA) • MR-angiography (MRA) • Digital subtraction angiography (DSA) • Intracranial aneurysms • Volume rendering technique (VRT) ; Schlüsselwörter CT-Angiographie (CTA) • MR-Angiographie (MRA) • DSA • Intrakranielle Aneurysmen • Volumen Rendering Technik (VRT)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Fragestellung: In einer klinischen Fallstudie wurden 35 Patienten mit intrakraniellen Aneurysmen mit CT-Angiographie (CTA), MR-Angiographie (MRA) und digitaler Subtraktionsangiographie (DSA) untersucht. Ziel der Studie war festzustellen, inwieweit nichtinvasive Verfahren in der Lage sind intrakranielle Aneurysmen nachzuweisen. Methodik: Die CT-Untersuchungen erfolgten mit einem Spiralscanner, die MR-Messungen mit einem 1.5 T Ganzkörpersystem. Die MR-Angiographien wurden in Time of Flight (TOF)- und Phasenkontrast (PC)-Technik durchgeführt. Die Nachverarbeitung erfolgte mit Maximum Intensity Projection (MIP), Oberflächen- und Volumenrendering (VRT) Technik. Die Ergebnisse wurden durch die intraoperativen Befunde bewertet. Ergebnisse: Aneurysmen bis 5 mm konnten am besten mit CTA und DSA nachgewiesen werden. Riesenaneurysmen waren am besten mit der CTA zu beurteilen. Volumenrendering stellte die beste Nachverarbeitungstechnik dar. Time of Flight MR-Angiographie war der Phasenkontrast Technik überlegen. Schlußfolgerung: Die CTA stellt die beste Methode dar, um Riesenaneurysmen zu beurteilen. Die gewählte Nachverarbeitungstechnik hat allerdings entscheidenden Einfluß auf die Ergebnisse.
    Notes: Purpose: In a clinical study 35 patients with intracranial aneurysms were examined using CT-angiography, MR-angiography (MRA) and digital subtraction angiography (DSA). The aim of the study was to establish the ability of noninvasive techniques to detect intracranial aneurysms. Material and methods: The CT examinations were performed using a spiral CT scanner and the MR investigations with a 1.5 T whole body MR-system. We used for MR-angiography Time of Flight (TOF) and Phase Contrast (PC) techniques. For postprocessing reconstructions modalities Maximum Intensity Projection (MIP), Surface and Volume Rendering Technique (VRT) techniques were used. The results were evaluated by the intraoperative findings. Results: Aneurysms up to 5 mm could be detected best using CTA and DSA. Giant aneurysms could be evaluated best using CTA. Volume rendering technique was the most useful postprocessing procedure. MRA using Time of Flight was superior compared with MRA using PC technique. Conclusion: CTA is the best method to detect and to evaluate giant intracranial aneurysms. Nevertheless the reconstruction mode has a decisive influence on the results.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Clinical rheumatology 5 (1986), S. 201-209 
    ISSN: 1434-9949
    Keywords: Roentgen Stereophotogrammetry ; Joint Kinematics ; Joint Traction ; Isometric Exercises ; Rheumatoid Arthritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Kinematic studies of the rheumatoid knee joint with the aid of roentgen stereophotogrammetry were performed in 4 patients (6 knees). Three kinds of experiments were carried out. The screw axis of rotation between various flexion angles was determined. The displacement of the screw axis indicated pathological function in all cases. Using different treatment techniques the effect of traction was studied. A separation between the femur and the tibia of 1.3–3.8 mm was found in 3 knees which were slightly flexed during the traction. The compression effect of isometric knee extension was determined in 4 knees. Compression of 0.5 mm at a medial point and of 0.3 mm at a lateral point of the femoral condyle were found in one knee. The present study indicates that roentgen stereophotogrammetric analysis may give additional information on the development of internal derangement of the rheumatoid knee joint.
    Type of Medium: Electronic Resource
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