自从Blumgart等首先应用镭和以云雾室作为辐射探测装置测定人体循环时间以来,放射性示踪剂用于心脏结构的评价,已有50余年。随着仪器和放射性药物的改进,现已可用以测定局部室壁活动和左、右心室的容量,局部心肌灌注以及探查急性损伤的心肌组织。放射性示踪方法测定的功能取决于所给的放射性药物的类型、观察时间和所用测定仪器的类型。记录心血管检查数据的常用核仪器有三大类:(1)闪烁探头系统;(2)线性扫描机;(3)闪烁照相机。这些仪器都采用(1)碘化钠晶体接纳入射光子而产生一光亮点;(2)光电倍增管探测光点并转换成电讯号;(3)放大器;(4)读出装置。这些仪器的 Radical trackers have been used for the evaluation of cardiac structures for more than 50 years since Blumgart et al. First applied radium and the cloud chamber as a radiation detector to measure human circulation time. With the improvements in instrumentation and radiopharmaceuticals, it is now available to measure local wall activity and left and right ventricular volumes, regional myocardial perfusion, and to explore acutely injured myocardial tissue. The function of a radiotracer assay depends on the type of radiopharmaceutical given, on the time of observation and on the type of measuring instrument used. There are three general categories of nuclear instrumentation used to record cardiovascular data: (1) the scintillation probe system; (2) the linear scanner; and (3) the scintillation camera. These instruments use (1) sodium iodide crystals to receive incident photons to produce a bright spot; (2) photomultiplier tubes detect light spots and convert them to electrical signals; (3) amplifiers; and (4) readout devices. These instruments