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传统的放射性核素闪烁照相术,虽然可以提供放射性物质在机体内的分布情况,从而检测到正常的生化活动或异常的患病部位的信息,但是这种方法只能将立体的放射性分布投射到一个平面内,以致不能明确辨别受损组织的深度.而且也由于从不同深度发出的放射性相互重叠在一起,因此导致病变区域模糊不清。如果应用近年来快速发展的 X-射线计算机层析术(X-射线 CT),虽可获得人体中某一截面的几何图象,但是它不能对疾病作早期
Traditional radionuclide scintigraphy, although it can provide the distribution of radioactive material in the body to detect normal biochemical activity or abnormal diseased parts of the information, but this method can only three-dimensional distribution of radiation projected to In a plane so that the depth of the damaged tissue can not be clearly discerned, but also because the radiation emitted from different depths overlap with each other, resulting in a blurred area of the lesion. If X-ray computed tomography (X-ray computed tomography), which has been rapidly developed in recent years, is used to obtain geometric images of a cross-section of a human body, it can not give early warning of the disease