Prospective real-time correction for arbitrary head motion using active markers.
Prospective real-time correction for arbitrary head motion using active markers.
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DOI：
10.1002/mrm.22082
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发表时间：
2009-10
影响因子：
3.3
通讯作者：
Brown, Truman R.
中科院分区：
文献类型：
--
作者：
Ooi, Melvyn B.;Krueger, Sascha;Thomas, William J.;Swaminathan, Srirama V.;Brown, Truman R.
关键词：
MRI检查期间的患者运动可导致图像质量的严重下降，并且由于人口老龄化及其相关疾病而日益受到关注。这项工作提出了一种通用的策略，实时，图像内的刚体运动补偿，是兼容的多个成像序列。图像质量的改善，建立了志愿者运动过程中获得的结构脑MRI。集成有三个有源标记的头带固定到前额。通过将快速跟踪和更新模块交错到成像序列中来实现前瞻性校正。对于该模块的每次重复，短跟踪脉冲序列重新测量标记位置;在头部运动期间，将标记重新对准到其初始位置的刚体变换被反馈以自适应地更新图像平面-在获取k空间的下一个成像段之前将其保持在相对于头部的固定方向。在极端运动的情况下，k空间的损坏的线被拒绝并且用更新的几何结构重新采集。高精度跟踪测量（0.01毫米）和校正完成的时间分辨率（37毫秒）适合于实时应用。校正包需要最少的额外硬件，并完全集成到标准用户界面，促进可转移到临床实践。
Patient motion during an MRI exam can result in major degradation of image quality, and is of increasing concern due to the aging population and its associated diseases. This work presents a general strategy for real-time, intra-image compensation of rigid-body motion that is compatible with multiple imaging sequences. Image quality improvements are established for structural brain MRI acquired during volunteer motion. A headband integrated with three active markers is secured to the forehead. Prospective correction is achieved by interleaving a rapid track-and-update module into the imaging sequence. For every repetition of this module, a short tracking pulse-sequence re-measures the marker positions; during head motion, the rigid-body transformation that realigns the markers to their initial positions is fed back to adaptively update the image-plane – maintaining it at a fixed orientation relative to the head – before the next imaging segment of k-space is acquired. In cases of extreme motion, corrupted lines of k-space are rejected and re-acquired with the updated geometry. High precision tracking measurements (0.01 mm) and corrections are accomplished in a temporal resolution (37 ms) suitable for real-time application. The correction package requires minimal additional hardware and is fully integrated into the standard user interface, promoting transferability to clinical practice.
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