Motion artifact reduction and vessel enhancement for free-breathing navigator-gated coronary MRA using 3D k-space reordering
Motion artifact reduction and vessel enhancement for free-breathing navigator-gated coronary MRA using 3D k-space reordering
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DOI：
10.1002/mrm.1087
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发表时间：
2001-04-01
影响因子：
3.3
通讯作者：
Stuber, M
中科院分区：
文献类型：
--
作者：
Huber, ME;Hengesbach, D;Stuber, M
数据采集过程中呼吸引起的心肌整体运动可能会导致冠状动脉磁共振血管造影 (MRA) 中出现严重的图像伪影。当前的运动补偿策略包括屏气或自由呼吸 MR 导航器门控和跟踪技术。通过应用复杂的 2D k 空间重新排序技术，基于导航器的技术得到了进一步完善。 3D k 空间重新排序方案有望进一步提高图像质量并减少相对扫描持续时间。因此，实施了一种 3D k 空间重新排序采集方案，包括用于冠状动脉 MRA 的 3D 导航器门控和校正分段 k 空间梯度回波成像序列。这种新的区域运动自适应采集和重新排序技术 (ZMART) 是在布洛赫方程数值模拟的基础上开发的。该技术在商用 1.5T MR 系统上实施，并进行了首次体模和体内实验。与理论研究结果一致，模型研究中获得的结果表明，与传统（非 k 空间重新排序）门控技术相比，运动伪影显着减少。初步的体内研究结果也优于模型实验和理论考虑。 Magn Reson Med 46:645-652, 2001。(C) 2001 Wiley-Liss, Inc.
Breathing-induced bulk motion of the myocardium during data acquisition may cause severe image artifacts in coronary magnetic resonance angiography (MRA). Current motion compensation strategies include breath-holding or free-breathing MR navigator gating and tracking techniques. Navigator-based techniques have been further refined by the applications of sophisticated 2D k-space reordering techniques. A further improvement in image quality and a reduction of relative scanning duration may be expected from a 3D k-space reordering scheme. Therefore, a 3D k-space reordered acquisition scheme including a 3D navigator gated and corrected segmented k-space gradient echo imaging sequence for coronary MRA was implemented. This new zonal motion-adapted acquisition and reordering technique (ZMART) was developed on the basis of a numerical simulation of the Bloch equations. The technique was implemented on a commercial 1.5T MR system, and first phantom and in vivo experiments were performed. Consistent with the results of the theoretical findings, the results obtained in the phantom studies demonstrate a significant reduction of motion artifacts when compared to conventional (non-k-space reordered) gating techniques. Preliminary in vivo findings also compare favorably with the phantom experiments and theoretical considerations. Magn Reson Med 46:645-652, 2001. (C) 2001 Wiley-Liss, Inc.