Prospective motion correction with continuous gradient updates in diffusion weighted imaging
Prospective motion correction with continuous gradient updates in diffusion weighted imaging
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DOI：
10.1002/mrm.23230
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发表时间：
2012-02-01
影响因子：
3.3
通讯作者：
Zaitsev, Maxim
中科院分区：
文献类型：
--
作者：
Herbst, Michael;Maclaren, Julian;Zaitsev, Maxim
尽管存在许多运动校正方法，但MRI期间的头部运动仍然是伪影的主要来源，并且可以大大降低图像质量。这特别适用于扩散加权成像，其中在长编码周期期间应用强梯度。这些是编码微观运动所必需的。然而，它们也使得该技术对体运动高度敏感。在这项工作中，我们提出了一个前瞻性的运动校正方法，其中所有应用的梯度不断调整，以补偿对象位置的变化，并确保所需的相位演变的图像坐标系。此外，在体模实验中，这种新技术用于通过改变成像帧相对于测量对象的位置来高精度地再现运动伪影。在体内测量证明了新的校正方法的有效性。Magn Reson Med，2012年。(C)2011 Wiley Periodicals，Inc.
Despite the existence of numerous motion correction methods, head motion during MRI continues to be a major source of artifacts and can greatly reduce image quality. This applies particularly to diffusion weighted imaging, where strong gradients are applied during long encoding periods. These are necessary to encode microscopic movements. However, they also make the technique highly sensitive to bulk motion. In this work, we present a prospective motion correction method where all applied gradients are adjusted continuously to compensate for changes of the object position and ensure the desired phase evolution in the image coordinate frame. Additionally, in phantom experiments this new technique is used to reproduce motion artifacts with high accuracy by changing the position of the imaging frame relative to the measured object. In vivo measurements demonstrate the validity of the new correction method. Magn Reson Med, 2012. (C) 2011 Wiley Periodicals, Inc.