一、引言癌症给人类健康带来极大的危害。对肿癌的早期诊断,是世界各国注重研究的重要课题。二、诊断仪的物理基础人体的微波热辐射与人体组织温度成正比。由Raylelgh-Jeans 公式可知人体辐射谱亮度B_f=E·2KJ/γ~2 (1)式中E 为发射率,K 为Boltzman 常数,其值等于1.38×10~(-23)J·K~(-1),T 为组织体温,γ为波长。由于肿癌的特异性抗原和超敏作用,病毒、致癌因子等都可刺激血液循环功能,以致肿癌组织的含水量明显升高。于是在微波频段,肿癌组织的介电常数ε和导电率比正常组织都 First, the introduction of cancer to human health has brought great harm. Early diagnosis of cancer is an important issue that countries all over the world pay attention to. Second, the physical basis of the diagnostic apparatus The human body’s microwave heat radiation is proportional to the temperature of human tissue. The Rayleighgh-Jeans formula shows that the human body radiation spectrum brightness is B_f = E · 2KJ / γ ~ 2 (1) where E is the emissivity and K is the Boltzman constant with a value equal to 1.38 × 10 ~ (-23) J · K ~ -1), T is tissue temperature, and γ is wavelength. Because of cancer-specific antigens and hypersensitivity, viruses, carcinogenic factors can stimulate blood circulation, resulting in significantly increased the water content of cancer tissue. So in the microwave band, tumor tissue of the dielectric constant ε and conductivity than normal tissue