采用电影相位对比磁共振成像评估心肌运动追踪
Evaluation of myocardial motion tracking with cine-phase contrast magnetic resonance imaging.
作者信息
Pelc L R, Sayre J, Yun K, Castro L J, Herfkens R J, Miller D C, Pelc N J
机构信息
Department of Radiology, Stanford University School of Medicine, California, USA.
出版信息
Invest Radiol. 1994 Dec;29(12):1038-42. doi: 10.1097/00004424-199412000-00005.
RATIONALE AND OBJECTIVES
The accuracy of myocardial motion measurements, computed from cine-phase contrast (cine-PC) magnetic resonance (MR) velocity data, was compared with directly visualized motion of MR signal voids caused by implanted tantalum markers in anesthetized dogs.
METHODS
Magnetic resonance imaging (MRI) data were electrocardiogram-gated and divided into 16 phases per cardiac cycle. Myocardial trajectories as a function of time in the cardiac cycle were measured using both methods for four to seven markers in each of eight animals.
RESULTS
The peak observed in-plane excursion was 4.0 +/- 2.1 mm. The average deviation between displacements derived from velocity data versus displacements visualized directly was 1.1 +/- 0.7 mm (27.5% of the peak displacement). The difference was less if three separate MR scans were used to measure each velocity component in the cine-PC method. This improvement is probably caused by improved temporal resolution.
CONCLUSIONS
Cine-PC MRI offers a noninvasive method for accurate quantification of myocardial motion.
原理与目的
将从电影相位对比（cine-PC）磁共振（MR）速度数据计算得出的心肌运动测量准确性，与麻醉犬体内植入钽标记物所产生的MR信号空洞的直接可视化运动进行比较。
方法
磁共振成像（MRI）数据采用心电图门控，每个心动周期分为16个阶段。在8只动物中，对每只动物体内4至7个标记物，同时使用两种方法测量心动周期中作为时间函数的心肌轨迹。
结果
观察到的平面内最大偏移为4.0 +/- 2.1毫米。从速度数据得出的位移与直接可视化位移之间的平均偏差为1.1 +/- 0.7毫米（为最大位移的27.5%）。如果在cine-PC方法中使用三次单独的MR扫描来测量每个速度分量，差异会更小。这种改进可能是由于时间分辨率提高所致。
结论
cine-PC MRI提供了一种用于准确量化心肌运动的非侵入性方法。
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