Exposure to low temperature environment for a long time, serious wound and major surgery often lead to hypothermia, the core temperature of body lower than 35℃. , which can result in physiological occlusion disorder and even death. It is very important to re warm up quickly and do not damage the body simultaneously. Treatment methods are required to rewarm the body quickly while the temperature within the body is uniform. Based on reverberation chamber theory, finite-difference time-domain ( FDTD) was adopted to simulate the distribution specific absorption rates (SARa) within the human detailed model, the temperature distribution was analyzed according to the bio-heat equation ( BHE). The power density met to the ICNIRP basic limitation when human body was exposed to electromagnetic waves of 40 MHz and 915 MHz. A rewarm solution was proposed as following: 40MHz was used when the body temperature was lower than 28℃ , and then 915 MHz was used when the body temperature had been rewarmed up higher than 28℃.%低温环境、严重创伤或重大手术往往会造成人体中心温度低于35℃的低体温状态,导致机体生理功能的紊乱以至死亡.对低温人体及时而有效地复温,是挽救生命的重要手段.既要有效复温又要使复温过程不对人体造成新的伤害,要求所采用的方法既能使复温速度在人体生理功能能够承载的前提下尽可能地快,又能使人体内各处的温度尽可能地均匀.基于混响室理论,采用FDTD方法,计算在电磁波照射下精细人体仿真模型内的分布比吸收率,并依据热传导方程分析人体内的温度分布.给出用频率为40 MHz和915 MHz电磁波进行人体复温时,满足ICNIRP辐射限值标准的功率密度；提出体温在28℃之前用40 MHz电磁波照射使其快速复温,接近28℃时用915 MHz照射使其均匀复温的方法.
展开▼
