Prospective respiratory motion correction for coronary MR angiography using a 2D image navigator
Prospective respiratory motion correction for coronary MR angiography using a 2D image navigator
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DOI：
10.1002/mrm.24280
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发表时间：
2013-02-01
影响因子：
3.3
通讯作者：
Botnar, Rene M.
中科院分区：
文献类型：
--
作者：
Henningsson, Markus;Smink, Jouke;Botnar, Rene M.
呼吸运动仍然是大量接受冠状动脉磁共振血管造影术的患者的主要障碍。冠状动脉磁共振血管造影术中的运动校正通常使用血管1D导航器（1Dnav）执行，假设血管和心脏呼吸运动之间存在恒定的线性关系。在这项工作中，提出了一种新的2D导航仪（2Dnav），它前瞻性地纠正在脚部和左侧方向的平移运动。首先，在2D真实的时间成像实验中，通过评估10名健康受试者以及移动血管体模中的残余呼吸运动，比较基于1Dnav和2Dnav的运动校正。随后，采集1Dnav和2Dnav校正的高分辨率3D冠状动脉MR血管造影片，并评估客观和主观图像质量。对于10 mm的门控窗口，1Dnav和2Dnav的表现同样良好;然而，在没有任何呼吸门控的情况下，1Dnav的所有冠状动脉视觉评分低于10 mm门控，而没有门控的2Dnav的表现与10 mm门控的1Dnav相似。Magn Reson Med，2013年。(C)2012 Wiley Periodicals，Inc.
Respiratory motion remains the major impediment in a substantial amount of patients undergoing coronary magnetic resonance angiography. Motion correction in coronary magnetic resonance angiography is typically performed with a diaphragmatic 1D navigator (1Dnav) assuming a constant linear relationship between diaphragmatic and cardiac respiratory motion. In this work, a novel 2D navigator (2Dnav) is proposed, which prospectively corrects for translational motion in foothead and leftright direction. First, 1Dnav- and 2Dnav-based motion correction are compared in 2D real time imaging experiments, by evaluating the residual respiratory motion in 10 healthy subjects as well as in a moving vessel phantom. Subsequently, 1Dnav and 2Dnav corrected high-resolution 3D coronary MR angiograms were acquired, and both objective and subjective image quality were assessed. For a gating window of 10 mm, 1Dnav and 2Dnav performed equally well; however, without any respiratory gating, the 1Dnav had a lower visual score for all coronary arteries compared with 10 mm gating, whereas the 2Dnav without gating performed similar to 1Dnav with 10 mm gating. Magn Reson Med, 2013. (C) 2012 Wiley Periodicals, Inc.