期刊
PHYSICS IN MEDICINE AND BIOLOGY
卷 52, 期 9, 页码 2337-2353出版社
IOP PUBLISHING LTD
DOI: 10.1088/0031-9155/52/9/001
关键词
-
资金
- MRC [G9900259] Funding Source: UKRI
- Medical Research Council [G9900259] Funding Source: researchfish
- Medical Research Council [G9900259] Funding Source: Medline
The spatial distributions of the electric fields induced in the human body by switched magnetic field gradients in MRI have been calculated numerically using the commercial software package, MAFIA, and the three- dimensional, HUGO body model that comprises 31 different tissue types. The variation of vertical bar J vertical bar, vertical bar E vertical bar and vertical bar B vertical bar resulting from exposure of the body model to magnetic fields generated by typical whole- body x-, y- and z- gradient coils has been analysed for three different body positions (head-, heart- and hips- centred). The magnetic field varied at 1 kHz, so as to produce a rate of change of gradient of 100 T m(-1) s(-1) at the centre of each coil. A highly heterogeneous pattern of induced electric field and current density was found to result from the smoothly varying magnetic field in all cases, with the largest induced electric fields resulting from application of the y- gradient, in agreement with previous studies. By applying simple statistical analysis to electromagnetic quantities within axial planes of the body model, it is shown that the induced electric field is strongly correlated to the local value of resistivity, and the induced current density exhibits even stronger correlation with the local conductivity. The local values of the switched magnetic field are however shown to bear little relation to the local values of the induced electric field or current density.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据