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Effects of static and radiofrequency magnetic field inhomogeneity in ultra-high field magnetic resonance imaging 总被引:2,自引:0,他引:2
Truong TK Chakeres DW Beversdorf DQ Scharre DW Schmalbrock P 《Magnetic resonance imaging》2006,24(2):103-112
To characterize the severe static (B(0)) and radiofrequency (B(1)) magnetic field inhomogeneity in ultra-high field (> or =7 T) magnetic resonance imaging, gradient echo (GE) and spin echo (SE) images of in vivo and postmortem human brains were acquired. The B(0) and B(1) inhomogeneity were experimentally mapped and/or numerically simulated, and correlated with the image artifacts. Whereas B(0) inhomogeneity affects predominantly GE images near air/tissue interfaces, B(1) inhomogeneity affects SE images more severely and shows non-intuitive patterns. Mapping of the B(0) and B(1) inhomogeneity is important in characterizing image artifacts. This will help develop better B(0) and B(1) inhomogeneity correction methods. 相似文献
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