利用红外传感器对磁共振成像射频探头进行评估。

Evaluation of MRI RF probes utilizing infrared sensors.

作者信息

Ibrahim Tamer S, Lee Robert

机构信息

Department of Radiology, University of Pittsburgh, Pittsburgh, PA 15216, USA.

出版信息

IEEE Trans Biomed Eng. 2006 May;53(5):963-7. doi: 10.1109/TBME.2006.871892.

DOI:10.1109/TBME.2006.871892

PMID:16686420

Abstract

The magnetic resonance imaging (MRI) coil's radio frequency (RF) field distribution has a strong effect on image quality as well as specific absorption rate. In this paper, a method of probing a coil's RF field distribution over any unoccupied region of the coil is presented. This technique is based on the use of infrared sensing. The proposed method was implemented and tested on a high field RF volume coil operating at 340 MHz. Very good agreement was achieved between the infrared measurements and numerical data obtained utilizing an in-house three-dimensional finite-difference time-domain package. The results demonstrate that the proposed technique is practical, robust, and efficient in making accurate measurements of the electric field distributions in loaded and unloaded MRI coils.

摘要

磁共振成像（MRI）线圈的射频（RF）场分布对图像质量以及比吸收率有很大影响。本文提出了一种探测线圈在其任何未占用区域上的RF场分布的方法。该技术基于红外传感的应用。所提出的方法在一个工作于340 MHz的高场RF体线圈上得以实现并进行了测试。利用内部三维时域有限差分程序包获得的数值数据与红外测量结果之间取得了非常好的一致性。结果表明，所提出的技术在对加载和未加载的MRI线圈中的电场分布进行精确测量方面是实用、稳健且高效的。