NONSUSCEPTIBILITY ARTIFACTS DUE TO METALLIC OBJECTS IN MR-IMAGING

被引：118

作者：

CAMACHO, CR

PLEWES, DB

HENKELMAN, RM

机构：

[1] UNIV TORONTO,DEPT MED BIOPHYS,TORONTO,ON M4N 3M5,CANADA

[2] SUNNYBROOK HLTH SCI CTR,TORONTO,ON M4N 3M5,CANADA

来源：

JMRI-JOURNAL OF MAGNETIC RESONANCE IMAGING | 1995年 / 5卷 / 01期

关键词：

ARTIFACT; MODEL; MATHEMATICAL; STENTS AND PROSTHESES;

D O I：

10.1002/jmri.1880050115

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 authors investigated eddy current artifacts due to metallic objects within the magnetic resonance imaging field. The problem was simplified by using a circular copper loop as a model for the more complex eddy current pathways present in a metallic implant. With this simple geometry, the authors show that radio-frequency (RF)-induced eddy currents in the metal produce a significant local artifact, However, no appreciable artifacts due to the switching magnetic field gradients were observed. A detailed quantitative analysis of the mechanism of RF-induced eddy current artifact due to the the copper loop was performed. The artifact was demonstrated experimentally to result from perturbations of the transmit and receive sensitivities of the RF coil. Theoretical calculations of these perturbations showed excellent agreement with experimental results. With an understanding of the artifact mechanism, methods for correcting the RF-induced eddy current artifact were applied.

引用

页码：75 / 88

页数：14

共 45 条

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