CORRECTION FOR GEOMETRIC DISTORTION IN ECHO-PLANAR IMAGES FROM B-0 FIELD VARIATIONS

被引：1122

作者：

JEZZARD, P

BALABAN, RS

机构：

[1] Laboratory of Cardiac Energetics, NHLBI, National Institutes of Health, Bethesda, Maryland

来源：

MAGNETIC RESONANCE IN MEDICINE | 1995年 / 34卷 / 01期

关键词：

ECHO PLANAR IMAGING; EPI; GEOMETRIC DISTORTION; FIELD MAP CORRECTION;

D O I：

10.1002/mrm.1910340111

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：

A method is described for the correction of geometric distortions occurring in echo planar images. The geometric distortions are caused in large part by static magnetic field inhomogeneities, leading to pixel shifts, particularly in the phase encode direction. By characterizing the field inhomogeneities from a field map, the image can be unwarped so that accurate alignment to conventionally collected images can be made. The algorithm to perform the unwarping is described, and results from echo planar images collected at 1.5 and 4 Tesla are shown.

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页码：65 / 73

页数：9

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