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首页> 外文期刊>Magnetic resonance in medicine: official journal of the Society of Magnetic Resonance in Medicine >Prospective motion correction using coil‐mounted cameras: Cross‐calibration considerations
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Prospective motion correction using coil‐mounted cameras: Cross‐calibration considerations

机译：使用线圈式摄像机的前瞻性运动校正：交叉校准注意事项

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Purpose Optical prospective motion correction substantially reduces sensitivity to motion in neuroimaging of human subjects. However, a major barrier to clinical deployment has been the time‐consuming cross‐calibration between the camera and MRI scanner reference frames. This work addresses this challenge. Methods A single camera was mounted onto the head coil for tracking head motion. Two new methods were developed: (1) a rapid calibration method for camera‐to‐scanner cross‐calibration using a custom‐made tool incorporating wireless active markers, and (2) a calibration adjustment method to compensate for table motion between scans. Both methods were tested at 1.5T and 3T in vivo. Simulations were performed to determine the required mechanical tolerance for repositioning of the camera. Results The rapid calibration method is completed in a short (30 s) scan, which is carried out only once per installation. The calibration adjustment method requires no extra scan time and runs automatically whenever the system is used. The mechanical tolerance analysis indicates that most motion (90% reduction in voxel displacement) could be corrected even with far larger camera repositioning errors than are observed in practice. Conclusion The methods presented here allow calibration of sufficient quality to be carried out and maintained with no additional technologist workload. Magn Reson Med 79:1911–1921, 2018. ? 2017 International Society for Magnetic Resonance in Medicine.
机译：目的光学预期运动校正基本上降低了人们对人类受试者神经模仿中的运动的敏感性。然而，临床部署的主要障碍是相机和MRI扫描仪参考帧之间的耗时的交叉校准。这项工作解决了这一挑战。方法将单个摄像机安装在头部线圈上，用于跟踪头部运动。开发了两种新方法：（1）使用包含无线活动标记的定制工具的摄像机到扫描仪交叉校准的快速校准方法，（2）校准调整方法，以补偿扫描之间的表运动。两种方法在1.5T和3T的体内测试。进行仿真以确定对相机重新定位所需的机械耐受性。结果快速校准方法在短（＆ 30秒）扫描中完成，仅在每个安装中执行一次。校准调整方法不需要额外的扫描时间，只要使用系统时都会自动运行。机械耐受分析表明，即使在实践中观察到的相机重新定位误差，也可以校正大多数运动（体素位移的90％）校正。结论这里提出的方法允许校准足够的质量，并没有额外的技术人员工作量进行。 Magn Reson Med 79：1911-1921,2018 2017年医学磁共振的国际社会。

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