Department of Radiology, Northwestern University, 737 N Michigan Avenue, Suite 1600, Chicago, IL, 60611, USA,
Int J Cardiovasc Imaging. 2014 Jan;30(1):137-43. doi: 10.1007/s10554-013-0318-3. Epub 2013 Oct 30.
The aim of the present study was to assess the incremental benefit of compensating asynchronous cardiac quiescence in coronary wall MR imaging. With the approval of IRB, black-blood coronary wall MR imaging was performed on 30 older subjects (90 coronary wall segments). For round 1 coronary wall MR imaging, acquisition windows were traditionally set within rest period(4-chamber). Totally 51 of 90 images were ranked as "good" images and resulted in an interpretability rate of 57%. Then, an additional cine-MR was centered at coronary segments to obtain rest period(cross-sectional). The rest period(overlap) (the intersection between rest period(4-chamber) and rest period(cross-sectional)) was measured for each coronary segment. The "good" images had a longer rest period(overlap) and higher acquisition coincidence rate (the percentage of acquisition window covered by the rest period(overlap)) than "poor" images. Coronary wall rescans (round 2) were completed at 39 coronary segments that were judged as having "poor" images in round 1 scans. The acquisition window was set within the rest period(overlap). For the round 2 images, 17 of 39 (44%) coronary segments were ranked as "good" images. The overall interpretability rate (68 of 90, 76%) was significantly higher than that of the round 1 images alone. Our data demonstrated that asynchronous cardiac quiescence adversely affects the performance of coronary wall MR imaging. Individualizing acquisition windows based on multi-plane cine-MR helps to compensate for this motion discrepancy and to improve image quality.
本研究旨在评估补偿冠状动脉壁磁共振成像中异步心脏静止的增量获益。在 IRB 批准的情况下，对 30 名老年受试者（90 个冠状动脉壁节段）进行了黑血冠状动脉壁磁共振成像。在第一轮冠状动脉壁磁共振成像中，采集窗传统上设置在休息期（四腔）内。总共 90 个图像中有 51 个被评为“良好”图像，解释率为 57%。然后，在冠状动脉节段的中心增加了一个电影磁共振成像，以获得休息期（横截面）。每个冠状动脉节段都测量了休息期（四腔）和休息期（横截面）之间的休息期（重叠）。“良好”图像的休息期（重叠）较长，采集吻合率（采集窗覆盖休息期（重叠）的百分比）较高，而“不良”图像则较短。在第一轮扫描中被判断为“不良”图像的 39 个冠状动脉节段中，完成了冠状动脉壁再扫描（第二轮）。采集窗设置在休息期（重叠）内。对于第二轮图像，39 个冠状动脉节段中有 17 个（44%）被评为“良好”图像。整体解释率（90 个中的 68 个，76%）明显高于第一轮图像。我们的数据表明，异步心脏静止会对冠状动脉壁磁共振成像的性能产生不利影响。基于多平面电影磁共振成像的个体化采集窗有助于补偿这种运动差异，提高图像质量。
