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肝放射性核素体外显影已成为临床上诊断肝占位性病变的无创、简便、准确的方法之一。随着核医学诊断仪器的不断改进,一步成像的γ闪烁照相机已逐渐代替了逐点成像的闪烁扫描机。使成像的速度和灵敏度明显的提高。笔者曾对经病理证实的50例肝占位性病变患者行放射性核素肝γ闪烁照相检查,其检出率达94%。一、肝实质显像的原理当静脉注入30～1000nm大小的放射性胶体颗粒时,90%左右可被肝脏的网状内系统吞噬固定。在体外用闪烁扫描机或γ闪烁照相机可显示肝脏影像。正常时,放射性核素在肝内分布是均匀的。当肝内局部受到破坏或功能减低时,该处之网状内皮系统失去或减低了吞噬胶体颗粒的能力,因此相应部位在体外显
Liver radionuclide imaging in vitro has become a non-invasive, simple, and accurate method for the diagnosis of liver-occupying lesions. With the continuous improvement of nuclear medicine diagnostic instruments, one-step imaging gamma scintillation cameras have gradually replaced point-by-point imaging scintillation scanners. Make the imaging speed and sensitivity significantly improved. The author had performed radionuclide liver gamma scintigraphy examination of 50 liver-occupying lesions confirmed by pathology, and the detection rate was 94%. First, the principle of liver parenchyma When intravenous injection of 30 ~ 1000nm size of radioactive colloidal particles, about 90% can be phagocytized by the intrahepatic phagocyte system. Liver images can be displayed in vitro using a scintillation scanner or a gamma scintillation camera. Normally, the distribution of radionuclides in the liver is uniform. When the liver is partially damaged or its function is reduced, the reticuloendothelial system at this site loses or reduces the ability to phagocytose colloidal particles, so the corresponding site is displayed in vitro.