作者
M Dylan Tisdall, Aaron T Hess, Martin Reuter, Ernesta M Meintjes, Bruce Fischl, André JW van der Kouwe
发表日期
2012/8
期刊
Magnetic resonance in medicine
卷号
68
期号
2
页码范围
389-399
出版商
Wiley Subscription Services, Inc., A Wiley Company
简介
We introduce a novel method of prospectively compensating for subject motion in neuroanatomical imaging. Short three‐dimensional echo‐planar imaging volumetric navigators are embedded in a long three‐dimensional sequence, and the resulting image volumes are registered to provide an estimate of the subject's location in the scanner at a cost of less than 500 ms, ∼ 1% change in contrast, and ∼3% change in intensity. This time fits well into the existing gaps in sequences routinely used for neuroimaging, thus giving a motion‐corrected sequence with no extra time required. We also demonstrate motion‐driven selective reacquisition of k‐space to further compensate for subject motion. We perform multiple validation experiments to evaluate accuracy, navigator impact on tissue intensity/contrast, and the improvement in final output. The complete system operates without adding additional hardware to the …
引用总数
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