期刊
MAGNETIC RESONANCE IN MEDICINE
卷 62, 期 6, 页码 1629-1640出版社
WILEY
DOI: 10.1002/mrm.22122
关键词
MRI; readout-segmented; echo-planar imaging; diffusion-weighted imaging; DWI; diffusion tensor imaging; DTI; parallel imaging; entropy; motion
资金
- National Institutes of Health [2R01EB002711, 1R01EB008706, 1R21EB006860]
- Center of Advanced MR Technology at Stanford [P41RR09784]
- Swedish Research Council [K2007-53P-20322-01-4]
Readout segmentation (RS-EPI) has been suggested as a promising variant to echo-planar imaging (EPI) for high-resolution imaging, particularly when combined with parallel imaging. This work details some of the technical aspects of diffusion-weighted (DW)-RS-EPI, outlining a set of reconstruction methods and imaging parameters that can both minimize the scan time and afford high-resolution diffusion imaging with reduced distortions. These methods include an efficient generalized autocalibrating partially parallel acquisition (GRAPPA) calibration for DW-RS-EPI data without scan time penalty, together with a variant for the phase correction of partial Fourier RS-EPI data. In addition, the role of pulsatile and rigid-body brain motion in DW-RS-EPI was assessed. Corrupt DW-RS-EPI data arising from pulsatile nonlinear brain motion had a prevalence of similar to 7% and were robustly identified via k-space entropy metrics. For DW-RS-EPI data corrupted by rigid-body motion, we showed that no blind overlap was required. The robustness of RS-EPI toward phase errors and motion, together with its minimized distortions compared with EPI, enables the acquisition of exquisite 3 T DW images with matrix sizes close to 512(2). Magn Reson Med 62:1629-1640, 2009. (C) 2009 Wiley-Liss, Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据