静脉注入放射性核素后,记录放射性标记物通过心脏的量和分布情况可测定心脏的大小和功能.当放射性核素与血液均匀混合后,心腔和大血管内单位体积放射性量的改变与其血容量的改变成比例关系,由此得到心室总容量和有关测量指标,如喷血分数、排空和充盈以及局部室壁运动,或局部喷血分数,以及另外记录的肺部示踪剂的分布情况,可作为评价左心室功能的参考. After intravenous injection of radionuclides, the size and function of the heart can be measured by measuring the amount and distribution of radioactive labels through the heart.When the radionuclide and the blood are homogeneously mixed, changes in the radioactivity per unit volume in the cardiac chamber and in the large vessel are associated with their blood Volumetric changes are proportional to the resulting total ventricular volume and related measurements such as spiking scores, emptying and filling, and local wall motion, or local spiking scores, as well as additional recorded lung tracer profiles Situation, can be used as a reference to evaluate left ventricular function.