Ma En-sen, Wang Wu, Ma Guo-lin, Zheng Tao, Yu Hong-wei
Department of Radiology, China-Japan Friendship Hospital, Beijing 100029, China.
Zhonghua Yi Xue Za Zhi. 2012 Jan 17;92(3):175-8.
To determine the morphological characteristics of myocardial bridge and mural coronary artery (MB-MCA) and initially quantify the changes of MB-MCA in diastole and systole phase with multiple-phase reconstruction technique using 256-slice CT angiography (256-slice CTA).
We retrospectively collected the coronary artery imaging data of 861 patients undergoing 256-slice CTA with suspected or documented coronary artery disease. The images were reviewed by two independent radiologists, the diagnosis of MB-MCA was confirmed when consistency was obtained. The length, diameter and thickness of MB-MCA in the middle segment of LAD (LAD2) in diastole and systole phase were recorded, and changes of MB-MCA were calculated.
Among the 861 patients, 150 MB-MCA were found in 131 patients (15.2%). 99 MB-MCA (66.0%) were located in LAD2, the remaining 51 (34.0%) in the other segments of coronary arteries. The average length and thickness of MB was (17.6 ± 5.7) mm and (2.6 ± 0.7) mm, respectively. The average diameter change of MCA in LAD2 from systole phase to diastole phase was (1.2 ± 0.5) mm, and 41% of MCA have diameter stenosis more than 50% in systole phase.
The changes of MB-MCA from diastole to systole phase could be determined to some extent by 256-slice CTA multiple-phase reconstruction technique.
利用256层CT血管造影（256层CTA）的多期重建技术，确定心肌桥和壁冠状动脉（MB-MCA）的形态特征，并初步量化MB-MCA在舒张期和收缩期的变化。
我们回顾性收集了861例疑似或确诊为冠状动脉疾病且接受256层CTA检查患者的冠状动脉成像数据。由两名独立的放射科医生对图像进行评估，当意见一致时确诊为MB-MCA。记录舒张期和收缩期左前降支中段（LAD2）的MB-MCA的长度、直径和厚度，并计算MB-MCA的变化。
861例患者中，131例（15.2%）发现有150处MB-MCA。99处MB-MCA（66.0%）位于LAD2，其余51处（34.0%）位于冠状动脉的其他节段。MB的平均长度和厚度分别为（17.6±5.7）mm和（2.6±0.7）mm。LAD2中MCA从收缩期到舒张期的平均直径变化为（1.2±0.5）mm，41%的MCA在收缩期直径狭窄超过50%。
256层CTA多期重建技术在一定程度上可以确定MB-MCA从舒张期到收缩期的变化。
