Gandhi O P, Gu Y G, Chen J Y, Bassen H I
Department of Electrical Engineering, University of Utah, Salt Lake City 84112.
Health Phys. 1992 Sep;63(3):281-90. doi: 10.1097/00004032-199209000-00003.
We have previously reported local, layer-averaged, and whole-body-averaged specific absorption rates and induced currents for a 5,628-cell anatomically based model of a human for plane-wave exposures 20-100 MHz (Chen and Gandhi 1989). Using a higher resolution, 45,024-cell model of the human body, calculations have now been extended to 915 MHz using the finite-difference time-domain method. Because of the higher resolution of the model, it has been possible to calculate specific absorption rates for various organs (brain, eyes, heart, lungs, liver, kidneys, and intestines) and for various parts of the body (head, neck, torso, legs, and arms) as a function of frequency in the band 100-915 MHz. Consistent with some of the experimental data in the literature, the highest part-body-averaged specific absorption rate for the head and neck region (as well as for the eyes and brain) occurs at 200 MHz for the isolated condition and at 150 MHz for the grounded condition of the model. Also observed is an increasing specific absorption rate for the eyes for frequencies above 350 MHz due to the superficial nature of power deposition at increasing frequencies.
我们之前曾报道过一个基于人体解剖结构的5628细胞模型在20 - 100MHz平面波照射下的局部、层平均和全身平均比吸收率及感应电流（Chen和Gandhi，1989年）。现在，使用更高分辨率的45024细胞人体模型，利用时域有限差分法将计算扩展到了915MHz。由于模型分辨率更高，得以计算100 - 915MHz频段内不同器官（脑、眼、心脏、肺、肝脏、肾脏和肠道）以及身体不同部位（头部、颈部、躯干、腿部和手臂）的比吸收率随频率的变化。与文献中的一些实验数据一致，对于孤立状态的模型，头部和颈部区域（以及眼睛和大脑）的最高局部身体平均比吸收率出现在200MHz，而对于接地状态的模型则出现在150MHz。还观察到，由于随着频率增加功率沉积具有浅表性，350MHz以上频率时眼睛的比吸收率不断增加。
