近十年来 ,一类重要的放射性药物———放射性标记的受体结合肽的出现使核医学领域发生了巨大的变化。在脊椎动物 ,肽类物质通过与靶细胞表面的特异性受体结合来传递其生物功能。由于肽类物质分子小 ,易于从血液及其他非靶组织中迅速清除 ,且与靶组织表达的特异性受体具有高度 In the past decade, the emergence of a class of important radiopharmaceuticals, radiolabeled receptor binding peptides, has undergone tremendous changes in nuclear medicine. In vertebrates, peptides bind their biological functions by binding to specific receptors on the surface of target cells. Due to the small molecular weight of peptides, they are easily cleared from the blood and other non-target tissues and have a high degree of specificity with specific receptors expressed by target tissues