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  • 99mTc-Pertechnetate  (1)
  • Aortic regurgitation  (1)
  • 1
    ISSN: 1432-1459
    Keywords: Cerebral Circulation ; Gamma Camera ; Intravenous Technique ; 99mTc-Pertechnetate ; Vascular Disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurde mit Hilfe neuerer technischer Möglichkeiten (Kamerasystem, freie Regionenauswahl) untersucht, inwieweit nach intravenöser Bolusinjektion eines radioaktiven Indicators (10–15 mCi 99mTc Pertechnetat) aus Zeitaktivitätskurven, die mit kurzer Zeitkonstanten (0,5 sec) extern über bestimmten Hirnregionen aufgenommen wurden, vergleichende quantitative Aussagen über Störungen der Hirnzirkulation möglich sind. Hierzu haben wir mehrere Parameter an 70 Patienten für 2 verschiedene Regionen geprüft (32 Kontrollpatienten und 38 nach klinischen Kriterien gruppierte Patienten mit und ohne Störungen der Hirnzirkulation). Den höchsten Informationsgehalt wiesen Parameter auf, die aus der ersten Hälfte der Zeitaktivitätskurve abgeleitet waren. In 70% der Fälle stimmten die Ergebnisse der Hirnperfusionsuntersuchung mit den klinischen, angiographischen und pathologisch anatomischen Befunden überein. Falsch negative Ergebnisse waren häufiger als falsch positive.
    Notes: Summary Cebral circulation was investigated by means of rapid sequential scintigraphy (0.5 sec per frame) after intravenous injection of a bolus of 10–15 mCi 99mTechnetium-pertechnetate using a multicrystal gamma camera (Autofluoroscope). The data were stored on a digital tape. Different areas of interest were flagged and time-activity curves were generated from these areas. The clinical significance of different parameters developed from the curves was tested in 70 patients grouped by clinical criteria (32 controls and 38 neurological patients with and without abnormal cerebral circulation). Parameters developed from the first half of the time activity curves were the most informative. In 70% of the neurological patients the result of the brain perfusion study was in keeping with the clinical, angiographic and anatomical findings. False negative results were more frequent than false positive ones.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1619-7089
    Keywords: Radionuclide ventriculography ; Aortic regurgitation ; Mitral regurgitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In order to evaluate the significance of gated equilibrium radionuclide ventriculography (RNV) for non invasive quantification of valvular regurgitation and follow up, various approaches were tested concerning accuracy and reproducibility. By using in vitro labeling of red blood cells and extending the acquisition time, a clear reduction of dispersion was obtained in patients without valvular insufficiency. Quantification of regurgitation directly from functional images (ventricular amplitude or stroke volume image) was clearly superior compared to the variable region of interest method. Employing functional images, reproducibility between two observers and between two independent measurements was excellent. Correlation to regurgitation values determined by cardiac catheterization was only moderate with all RNV approaches tested. RNV is limited in the absolute quantification of valvular regurgitation due to the variable overlap of right atrium and right ventricle. However, because of its high reproducibility, RNV is a non invasive technique suitable for intraindividual follow up of patients with valvular insufficiency.
    Type of Medium: Electronic Resource
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