Jin Hang, Zeng Meng-Su, Ge Mei-Ying, Yang Shan, Chen Cai-Zhong, Shen Ji-Zhang, Li Ren-Chen
Department of Radiology, Zhongshan Hospital, Fudan University and Shanghai Medical Imaging Institute, 180#, Feng Lin Road, 200032 Shanghai, China.
Int J Cardiovasc Imaging. 2009 Apr;25 Suppl 1:121-9. doi: 10.1007/s10554-008-9415-0. Epub 2009 Jan 15.
To evaluate parallel-imaging methods in free-breathing whole-heart 3D coronary magnetic resonance angiography and assess the navigator techniques and visualization rates of the major coronary arteries. We compared key parameters of the generalized autocalibrating partially parallel acquisition and modified sensitive encoding images in vitro phantom MRI; performed the MRA with GRAPPA parallel imaging in healthy volunteers; compared 1D- and 2D-prospective acquisition correction and analyzed the differences; and evaluated the visualization of major coronary arterial branches. GRAPPA images had higher signal-to-noise ratio and contrast-to-noise ratio and fewer aliasing artifacts. The coronary arteries were adequately visualized in 38 volunteers. 2D-PACE had a higher navigator efficiency, shorter scan time, and gave clearer reconstructed images in comparison with 1D-PACE. GRAPPA images were superior to mSENSE images. Whole-heart 3D coronary MRA along with parallel-imaging technique is a potential clinical method, and 2D-PACE is a better navigation technique than 1D-PACE.
评估自由呼吸全心3D冠状动脉磁共振血管造影中的并行成像方法，并评估导航技术和主要冠状动脉的可视化率。我们比较了体外体模MRI中广义自校准部分并行采集和改进的敏感性编码图像的关键参数；在健康志愿者中采用GRAPPA并行成像进行磁共振血管造影；比较了一维和二维前瞻性采集校正并分析差异；并评估主要冠状动脉分支的可视化情况。GRAPPA图像具有更高的信噪比和对比噪声比，且伪影更少。38名志愿者的冠状动脉得到了充分可视化。与一维前瞻性采集校正（1D-PACE）相比，二维前瞻性采集校正（2D-PACE）具有更高的导航效率、更短的扫描时间，且重建图像更清晰。GRAPPA图像优于改进的敏感性编码（mSENSE）图像。全心3D冠状动脉磁共振血管造影结合并行成像技术是一种潜在的临床方法，且2D-PACE是比1D-PACE更好的导航技术。
