1　介电常数对微波诊断的影响有二个特点可作为微波诊断肿瘤的物理基础。一是肿瘤组织和周围组织的介电特性有显著差异 ,二是皮下组织介电特性的变化可以通过测量微波反射系数反映出来。近年来 ,由于生物组织的介电特性在体测量技术中的发展 ,使微波诊断肿瘤成为可能。微波诊断 1 The effect of dielectric constant on microwave diagnosis has two characteristics that can serve as a physical basis for microwave diagnosis of tumors. First, there is a significant difference in the dielectric properties between the tumor tissue and the surrounding tissue. Second, the change in the dielectric properties of the subcutaneous tissue can be reflected by measuring the microwave reflection coefficient. In recent years, due to the development of the dielectric properties of biological tissues in body measurement technology, it has become possible to diagnose tumors by microwaves. Microwave diagnosis