脉冲调制微波辐照生物组织的热效应及红外热成像研究

针对微波连续加热造成生物组织温升过高而损伤正常组织，提出计算机编码的脉冲调制微波辐照生物组织，有效控制加热区域内的温度分布.采用红外热成像的方式观察分层仿生体模中各层的温度分布，分析讨论脉冲调制微波占空比、频率和功率对生物组织加热区域内温度分布的影响.结果表明，采用提高脉冲调制微波占空比和功率或在一定范围内改变调制脉冲频率的方式来提高生物组织加热区域内的热效应.该方法将为肿瘤微波热疗提供新的有效加热方式和途径.

Heating effect and infrared thermography study of bio-tissues radiated by pulse modulated microwave

Normal tissues may be damaged due to the high temperature if heated by continuous microwave. We proposed that the temperature distribution of heated area inside the bio-tissues could be effectively controlled if the bio-tissues is radiated by pulse modulated microwave coded with computer. Infrared thermography was applied to image temperature distribution of sliced homogeneous simulating biomaterial. Effects of temperature distribution in heated area of bio-tissues were analyzed and discussed while duty cycle, power and frequency of pulse modulated microwave were changed. The results showed that raising the duty ratio and power, or changing frequency in certain range can make distinct heating effects in bio-tissues. It provides a new effective heating method for tumor hyperthermia.