Adaptive retrospective correction of motion artifacts in cranial MRI with multicoil three-dimensional radial acquisitions.
Adaptive retrospective correction of motion artifacts in cranial MRI with multicoil three-dimensional radial acquisitions.
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DOI：
10.1002/mrm.24348
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发表时间：
2013-04
影响因子：
3.3
通讯作者：
Samsonov, Alexey
中科院分区：
文献类型：
--
作者：
Anderson, Ashley G., III;Velikina, Julia;Block, Walter;Wieben, Oliver;Samsonov, Alexey
尽管通过改进硬件和快速采集方案减少了成像时间，但运动伪影可能会影响磁共振成像的图像质量，特别是在扫描时间较长的3D成像中。由于采样要求的显著增加，将最先进的2D刚体运动补偿技术直接扩展到3D情况通常具有挑战性或不切实际。本文介绍了一种新的运动校正技术，该技术能够在运动损坏的二维和三维径向采集中恢复图像质量，而无需对运动发生时间进行先验假设。径向采集的导航属性-由多个接收器线圈证实-被用来检测实际的运动实例。伪随机投影排序提供了从获得的无运动变宽度子集重建导航图像的灵活性，以便随后通过共配估计刚体运动参数。该方法不需要任何额外的导航器或外部运动估计方案。通过模拟和具有代表性的志愿者颅骨采集，描述和演示了该方法的功能和局限性。
Despite reduction in imaging times through improved hardware and rapid acquisition schemes, motion artifacts can compromise image quality in magnetic resonance imaging, especially in 3D imaging with its prolonged scan durations. Direct extension of most state-of-the-art 2D rigid body motion compensation techniques to the 3D case is often challenging or impractical due to a significant increase in sampling requirements. This paper introduces a novel motion correction technique that is capable of restoring image quality in motion corrupted 2D and 3D radial acquisitions without a priori assumptions about when motion occurs. The navigating properties of radial acquisitions – corroborated by multiple receiver coils – are exploited to detect actual instances of motion. Pseudo-random projection ordering provides flexibility of reconstructing navigator images from the obtained motion-free variable-width subsets for subsequent estimation of rigid-body motion parameters by co-registration. The proposed approach does not require any additional navigators or external motion estimation schemes. The capabilities and limitations of the method are described and demonstrated through simulations and representative volunteer cranial acquisitions.
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