期刊
MAGNETIC RESONANCE IN MEDICINE
卷 47, 期 4, 页码 818-822出版社
WILEY
DOI: 10.1002/mrm.10102
关键词
diffusion-weighted imaging; navigator correction; brain motion; cardiac pulsation; artifacts
资金
- NCRR NIH HHS [P41 RR15241] Funding Source: Medline
- NIBIB NIH HHS [P41 EB015909] Funding Source: Medline
- NICHD NIH HHS [R01 HD37931] Funding Source: Medline
Motion sensitivity in diffusion-weighted imaging (DWI) can be effectively suppressed using single-shot echo-planar imaging (EPI). However, segmented (multishot) EPI is often used to increase resolution and reduce spatial distortions, which in turn increases susceptibility to brain motion. The sources of these residual motion artifacts in navigator-echo-corrected segmented EPI images of the brain were investigated. The results indicate that the dominant source of these artifacts is cardiac pulsation with occasional involuntary movement of the subject. The relationship between the cardiac cycle and motion artifacts shows that optimum timing for the data acquisition is possible. In addition it is shown that the effects of involuntary motion can be removed by swapping k-space data between redundant datasets. (C) 2002 Wiley-Liss, Inc.
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