Compensating for B1 inhomogeneity using active transmit power modulation

被引：22

作者：

Clare, S ^{[1
]}

Alecci, M ^{[1
]}

Jezzard, P ^{[1
]}

机构：

[1] Univ Oxford, John Radcliffe Hosp, Dept Clin Neurol, Ctr Funct Magnet Resonance Imaging Brain, Oxford OX3 9DU, England

来源：

MAGNETIC RESONANCE IMAGING | 2001年 / 19卷 / 10期

关键词：

B-1; inhomogeneity; artifact; RF coil; MRI;

D O I：

10.1016/S0730-725X(01)00467-2

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

The effect of poor B-1 homogeneity on MRI images not only affects the appearance of the images, but produces difficulty in automated segmentation and in certain quantification methods. While improved RF coil design is the first line in reducing such artifact, compensation methods can significantly improve the quality of images. Existing methods of compensation typically apply a filter during the image reconstruction. Here a method is presented that compensates for part of the inhomogenceity by actively modulating the RF transmit power as a function of slice position. The method is demonstrated both quantitatively on a phantom and qualitatively on a human brain. (C) 2001 Elsevier Science Inc. All rights reserved.

引用

页码：1349 / 1352

页数：4

共 16 条

[1] Radio frequency magnetic field mapping of a 3 tesla birdcage coil: Experimental and theoretical dependence on sample properties [J].