EFFECT OF FIELD-STRENGTH ON SUSCEPTIBILITY ARTIFACTS IN MAGNETIC-RESONANCE-IMAGING

被引：116

作者：

FARAHANI, K ^{[1
]}

SINHA, U ^{[1
]}

SINHA, S ^{[1
]}

CHIU, LCL ^{[1
]}

LUFKIN, RB ^{[1
]}

机构：

[1] UNIV CALIF LOS ANGELES,CTR HLTH SCI,SCH MED,DEPT RADIOL SCI,LOS ANGELES,CA 90024

来源：

COMPUTERIZED MEDICAL IMAGING AND GRAPHICS | 1990年 / 14卷 / 06期

关键词：

Magnetic field strength; Magnetic resonance imaging; Paranasal sinuses; Susceptibility artifacts;

D O I：

10.1016/0895-6111(90)90040-I

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

In magnetic resonance imaging susceptibility artifacts occur at the interface of substances with large magnetic susceptibility differences, resulting in geometric distortions of the image at those boundaries. The susceptibility artifacts are often subtle on clinical images and if not carefully examined they may lead to misdiagnosis. Magnetic susceptibility artifacts are prevalent on the boundary of air-containing paranasal sinuses, as well as bone-soft tissue interfaces in the spinal canal. The appearance of these artifacts on images from three different magnetic field strength instruments, 0.3, 0.5, and 1.5 Tesla were studied. T1- and T2-weighted spin echo and gradient recalled echo pulse sequences were selected to image a water phantom containing substances of varying susceptibilities. The effects were also studied in MR images of the head in a normal human volunteer. At any given field strength the artifacts were more prominent in the gradient echo imaging than in the corresponding spin echo pulse sequence. As expected, the distortions were also greater at higher field strengths. The results in human subject paralleled the findings in the phantom study. © 1990.

引用

页码：409 / 413

页数：5

共 3 条

[1] Ludeke, Roschmann, Tischler, Susceptibility artifacts in NMR imaging, Magn. Reson. Imaging, 3, pp. 329-343, (1985)
[2] Czervionke, Daniels, Wehrli, Et al., Magnetic susceptibility artifacts in gradient-recalled echo MR imaging, Am. J. Neuro. Rad., 9, pp. 1149-1155, (1988)
[3] Cox, Bydder, Gadian, Et al., The effect of magnetic susceptibility variations in NMR imaging and NMR spectroscopy in vivo, J. Magn. Reson., 70, pp. 163-168, (1986)

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