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目的:计算并比较不同频率电磁波作用下人体中枢神经系统比吸收率(specific absorption rate,SAR)分布特点,为寻找损伤靶点和设计试验提供剂量学依据。方法:采用时域有限差分法计算人体仿真模型比吸收率及其分布。模型身高1.70m,体重63kg,由42种组织器官共1.4×107个网格单元构成。结果:给出了50MHz～3GHz频率范围、平面波、前后向照射、E和H极化条件下人体中枢神经系统SAR,其中脊髓、小脑和大脑分别在90MHz、250MHz和900MHz达到SAR峰值,分别为0.57,0.28和0.32W/kg。结论:中枢神经系统中的大脑、小脑和脊髓分别在不同的频率处具有高电磁能量的吸收。
OBJECTIVE: To calculate and compare the distribution of central nervous system specific absorption rate (SAR) under different frequencies of electromagnetic waves, and to provide dosimetric evidence for the purpose of finding the target of damage and designing experiments. Methods: The time-domain finite difference method was used to calculate the specific absorption rate and its distribution of the human body simulation model. Model height 1.70m, weight 63kg, by a total of 42 kinds of tissues and organs of a total of 1.4 × 107 grid cells. Results: The human central nervous system (SAR) with 50MHz ~ 3GHz frequency range, plane wave, forward and backward illumination, E and H polarization was obtained. The spinal cord, cerebellum and brain reached the peak values of SAR at 90MHz, 250MHz and 900MHz respectively, reaching 0.57 , 0.28 and 0.32 W / kg. Conclusion: The brain, cerebellum and spinal cord in the central nervous system have high electromagnetic energy absorption at different frequencies, respectively.