Influence of human model resolution on computed currents induced in organs by 60-Hz magnetic fields.
Influence of human model resolution on computed currents induced in organs by 60-Hz magnetic fields.
复制标题
人体模型分辨率对 60 Hz 磁场在器官中感应的计算电流的影响。
作者：
T. Dawson;K. Caputa;M. Stuchly
研究了人体模型分辨率对60 Hz均匀磁场计算电场的影响。最近开发的用于低频电磁计算的标量势有限差分程序被用来模拟两个解剖学上逼真的人体模型中的感应。第一个模型由204290个边长为7.2 mm的立方体素组成，第二个模型由1639146个边长为3.6 mm的立方体素组成。在较低分辨率模型上使用例如时域有限差分或阻抗方法进行计算，推动了工作站的能力。相比之下，标量方法可以使用类似的资源处理更高分辨率的模型。结果以选定组织和器官中的平均和最大电场强度以及电流密度大小的形式给出。尽管较低分辨率的模型提供了通常可接受的结果，但有一些重要的差异使得较高分辨率的计算增加的计算负担是值得的。特别是，较高分辨率的模型通常预测的峰值电场强度和电流密度大小略高于使用较低分辨率模型计算的峰值电场强度和电流密度。对于腺体等较小的器官来说，差异可能会相当大。
The effects of human body model resolution on computed electric fields induced by 60 Hz uniform magnetic fields are investigated. A recently-developed scalar potential finite difference code for low-frequency electromagnetic computations is used to model induction in two anatomically realistic human body models. The first model consists of 204290 cubic voxels with 7.2-mm edges, while the second comprises 1639146 cubic voxels with 3.6-mm edges. Calculations on the lower-resolution model using, for example, the finite difference time domain or impedance methods, push the capabilities of workstations. The scalar method, in contrast, can handle the higher-resolution model using comparable resources. The results are given in terms of average and maximum electric field intensities and current density magnitudes in selected tissues and organs. Although the lower-resolution model provides generally acceptable results, there are important differences that make the added computational burden of the higher-resolution calculations worthwhile. In particular, the higher-resolution modelling generally predicts peak electric fields intensities and current density magnitudes that are slightly higher than those computed using the lower-resolution modelling. The differences can be quite large for small organs such as glands.