College of Electronic Engineering, South China Agricultural University, Guangzhou 510642, People's Republic of China.
Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan.
Phys Med Biol. 2020 Nov 24;65(22):224001. doi: 10.1088/1361-6560/abbdb7.
The averaged absorbed power density (APD) and temperature rise in body models with nonplanar surfaces were computed for electromagnetic exposure above 6 GHz. Different calculation schemes for the averaged APD were investigated. Additionally, a novel compensation method for correcting the heat convection rate on the air/skin interface in voxel human models was proposed and validated. The compensation method can be easily incorporated into bioheat calculations and does not require information regarding the normal direction of the boundary voxels, in contrast to a previously proposed method. The APD and temperature rise were evaluated using models of a two-dimensional cylinder and a three-dimensional partial forearm. The heating factor, which was defined as the ratio of the temperature rise to the APD, was calculated using different APD averaging schemes. Our computational results revealed different frequency and curvature dependences. For body models with curvature radii of >30 mm and at frequencies of >20 GHz, the differences in the heating factors among the APD schemes were small.
计算了高于 6GHz 的电磁辐射下非平面表面体模中的平均吸收功率密度（APD）和温升。研究了不同的平均 APD 计算方案。此外，还提出并验证了一种新的补偿方法，用于修正人体模型中空气/皮肤界面的热对流率。与之前提出的方法不同，该补偿方法可以很容易地纳入生物热计算，并且不需要边界体素法向方向的信息。使用二维圆柱体和三维部分前臂模型评估了 APD 和温升。使用不同的 APD 平均方案计算了定义为温升与 APD 之比的加热因子。我们的计算结果显示出不同的频率和曲率依赖性。对于曲率半径>30mm 的体模，在频率高于 20GHz 时，APD 方案之间的加热因子差异较小。
