Numerical simulation of SAR and B1-field inhomogeneity of shielded RF coils loaded with the human head

被引：108

作者：

Chen, J

Feng, ZM

Jin, JM

机构：

[1] Univ Illinois, Dept Elect & Comp Engn, Electromagnet Lab, Urbana, IL 61801 USA

[2] Univ Illinois, Dept Elect & Comp Engn, Magnet Resonance Engn Lab, Urbana, IL 61801 USA

来源：

IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING | 1998年 / 45卷 / 05期

关键词：

magnetic resonance imaging; numerical method; radio-frequency coil; radio-frequency field; specific absorption rate;

D O I：

10.1109/10.668756

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

The finite-difference time-domain (FDTD) method is combined with the method of moments (MoM) to compute the electromagnetic fields of shielded radio frequency (RF) coils loaded with an anatomically accurate model of a human head for high-frequency magnetic resonance imaging (MRI) applications. The combined method can predict both the specific energy absorption rate (SAR) and the magnetic field (known as the B-1 field) excited by any RF coils. Results for SAR and B-1 field distribution, excited by shielded and end-capped birdcage coils, are calculated at 64, 128, 171, and 256 MHz, The results show that the value of SAR increases when the frequency of the B-1 field increases and the B-1 field exhibits a strong inhomogeneity at high frequencies.

引用

页码：650 / 659

页数：10

共 31 条

[11] AN EFFICIENT, HIGHLY HOMOGENEOUS RADIOFREQUENCY COIL FOR WHOLE-BODY NMR IMAGING AT 1.5-T [J].