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Sequential scrotal scintigraphy was used to study testicular blood flow in 122 patients with clinically diagnosed varicocele. The sensitivity of scrotal scintigraphy was 91.7 % on the whole sequential images. The late-phase image was superior in sensitivity to that of the early-phase images. The difference in time between the arrival of radioactivity in the iliac artery and in the pampiniform plexus grew shorter with increasing grade of varicocele. Time-activity curves were classified into four patterns. One type (Type 3), which was more frequently observed in grade I1 and grade I11 varicocele than grade I varicocele, showed a decreased arterial perfusion of the left side lesion. It is concluded that scintigraphic analysis using both sequential images and time-activity curves is not only highly representative of the grade of clinically palpable varicocele, but also provides a better understanding of local hemodynamics in the scrotum.Zusammenfassung. Mittels sequentieller Skrotalszintigraphie wurde die testikulare Durchblutung von 122 Patienten mit klinischer Varikozele untersucht. Die Sensitivitat betrug 91,7 % uber die gesamten Sequenzbilder der Skrotalszintigraphie; die Bilder der spateren Phasen zeigten eine groBere Sensitivitat als die der fruheren Phasen. Der Zeitunterschied zwischen dem Auftritt der Aktivitat in der Darmarterie und im Plexus pampiniformis war um so kurzer, je groBer der Grad der Varikozele war. Die Zeitaktivifatskurven wurden in vier Mustern eingestuft; eines davon zeigte einen verringerten ZufluB in den Plexus pampiniformis. Die szintigraphische Analyse mit Darstellung von sequentiellen Bildern und Zeitaktivitatskurven gibt den Grad der klinisch fuhlbaren Varikozele deutlich wieder und erlaubt ein besseres Verstandnis der regionalen Hamodynamik im Skrotum.

We have produced 90mNb and 99mTc in the reactions of natZr(p,xn)90mNb and 100Mo(γ,n)99Mo, followed by disintegration to 99mTc, respectively, and measured the half-lives of these nuclides by using a reference source method. In order to determine the short half-lives of 90mNb precisely, an on-line gas-jet system has been employed. As a result, the half-lives of these nuclides were determined with good precision on the order of magnitude of 0.1%.