Diffusion imaging with prospective motion correction and reacquisition.
Diffusion imaging with prospective motion correction and reacquisition.
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DOI：
10.1002/mrm.22837
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发表时间：
2011-07
影响因子：
3.3
通讯作者：
Sorensen, A. Gregory
中科院分区：
文献类型：
--
作者：
Benner, Thomas;van der Kouwe, Andre J. W.;Sorensen, A. Gregory
关键词：
扩散加权成像 (DWI) 中伪影的主要来源是对象运动。当采集多个平均或扩散梯度方向时，缓慢的主体运动会导致数据未对准。快速的主体运动可能会导致扩散加权图像中的信号丢失伪影，并导致错误的导出图，例如分数各向异性图。为了解决这两类伪影，提出了一种全自动方法，该方法将前瞻性运动校正与重新捕获方案相结合。运动校正基于前瞻性采集校正 (PACE) 方法，经过修改可与扩散加权数据 (DW-PACE) 配合使用。在从成像数据采集期间自动确定要重新采集的图像，即不需要额外的参考扫描、导航器或外部设备。重新采集图像的数量，即额外的扫描持续时间可以自由调整。 DW-PACE 可以很好地纠正缓慢的整体运动，并减少图像模糊等未对准伪影。平移和旋转的平均绝对残差值分别小于 0.6 毫米和 0.5 度。重新采集受信号丢失伪影影响的图像会产生无伪影的扩散图和光纤跟踪。所提出的方法允许减少两种类型的常见运动相关伪影，但代价是稍微增加采集时间。
A major source of artifacts in diffusion-weighted imaging (DWI) is subject motion. Slow bulk subject motion causes misalignment of data when more than one average or diffusion gradient direction is acquired. Fast bulk subject motion can cause signal dropout artifacts in diffusion-weighted images and results in erroneous derived maps e.g. fractional anisotropy maps. To address both types of artifacts, a fully automatic method is presented that combines prospective motion correction with a reacquisition scheme. Motion correction is based on the Prospective Acquisition Correction (PACE) method modified to work with diffusion-weighted data (DW-PACE). The images to reacquire are determined automatically during the acquisition from the imaging data i.e. no extra reference scan, navigators or external devices are necessary. The number of reacquired images i.e. the additional scan duration can be adjusted freely. DW-PACE corrects slow bulk motion well and reduces misalignment artifacts like image blurring. Mean absolute residual values for translation and rotation were less than 0.6 mm and 0.5 degrees. Reacquisition of images affected by signal dropout artifacts results in diffusion maps and fiber tracking free of artifacts. The presented method allows the reduction of two types of common motion related artifacts at the cost of slightly increased acquisition time.
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