Millaire A, Hossein-Foucher C, Rousseau J, Bedoui H, Ducloux G, Marchandise X
Division of Cardiology, Hôpital Cardiologique, Centre Hospitalier Régional et Universitaire, Lille, France.
Med Phys. 1994 May;21(5):683-9. doi: 10.1118/1.597171.
The physical characteristics of a portable nonimaging scintillation probe system for continuous ambulatory monitoring of the left ventricular function are described. The detector of the equilibrium radionuclide labeled blood pool is a single cesium iodide (CsI) crystal coupled to a silicium photodiode and interfaced to a microcomputer. The spatial properties of this small CsI crystal (1 x 1 x 1 cm3) were evaluated with various single-hole collimators. Linearity was studied in nonattenuating medium. Saturation began at 3000 cps, count loss was 10% at 4000 cps, maximal count rate was 24,000 cps. In attenuating medium, isocount curve of 5% of the maximal count rate was 100 mm deep and 160 mm wide. The most appropriate tested lead collimator to record the global ejection fraction of the left ventricle was a disc-shaped (thickness 5 mm, diameter 41 mm) single-hole (proximal aperture 8 mm, distal aperture 18 mm) collimator. Sensitivity was similar to the sensitivity of a sodium iodide nuclear probe. The detection performance appeared comparable to other available detector systems. Our results indicate that such a CsI-photodiode probe is a promising candidate for left ventricular function monitoring. The application to an ambulatory multicrystal detector system is presented and discussed.
本文描述了一种用于连续动态监测左心室功能的便携式非成像闪烁探头系统的物理特性。平衡放射性核素标记血池的探测器是一个与硅光电二极管耦合并连接到微型计算机的单碘化铯（CsI）晶体。用各种单孔准直器评估了这种小CsI晶体（1×1×1 cm3）的空间特性。在无衰减介质中研究了线性度。在3000 cps时开始饱和，在4000 cps时计数损失为10%，最大计数率为24,000 cps。在衰减介质中，最大计数率5%的等计数曲线深度为100 mm，宽度为160 mm。用于记录左心室整体射血分数的最合适的测试铅准直器是盘形（厚度5 mm，直径41 mm）单孔（近端孔径8 mm，远端孔径18 mm）准直器。灵敏度与碘化钠核探头的灵敏度相似。检测性能似乎与其他可用的探测器系统相当。我们的结果表明，这种CsI-光电二极管探头是监测左心室功能的一个有前途的候选者。还介绍并讨论了其在动态多晶体探测器系统中的应用。
