中国胸心血管外科临床杂志

中国胸心血管外科临床杂志

使用磁共振弥散张量成像技术对心肌带结构的初步研究

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目的 初步研究用磁共振弥散张量成像(MRDTI)技术显示离体猪心心肌带结构的可能性。 方法 以MRDTI技术为基础,检测5个成年离体猪心,在猪心离体后2h内使用25个方向的弥散张量成像(DTI)序列扫描心室部分,之后使用脑白质纤维束成像重建方式显示心肌纤维的走行、分布和排列方式。 结果 MRDTI可以清晰显示离体1h心室肌纤维整体具有一定的连续性,在空间上螺旋、缠绕而形成左、右心室;左室壁的心肌纤维大体呈现心内膜下纵向排列、心肌中层斜行排列和心外膜下环行排列,这与心肌带理论相符合。 结论 MRDTI技术可以显示离体心肌纤维的完整性和排列方式,并能部分地证实心肌带理论的真实性

Objective To investigate the feasibility of magnetic resonance diffusion tensor imaging (MRDTI) technique in displaying myocardial fiber architecture. Methods In five ex vivo swine heart, diffusion tensor imaging (DTI) was acquired in 25 directions within 2 hours after excision. The myocardial fiber was reconstructed by using brain white matter tractography algorithm to display its course, distribution and arrangement. Results In the swine heart 1 hour after excision, MRDTI revealed that the arrangement of the myocardial fiber had certain continuity. It spiraled and twisted to form the left and right ventricle. The divection of general myocardial fiber in the left ventricle was vertical below endocardium, horizontal below epicardium and oblique in stratum medium, which is consistent with the theory of ventricular myocardial band. Conclusion MRDTI can reveal the myocardial fiber architecture, showing its integrity and arrangement, and at some level confirming the theory of ventricular myocardial band.

关键词: 心肌纤维; 磁共振成像; 弥散张量成像; 心肌带

Key words: Myocardial fiber; Magnetic resonance imaging; Diffusion tensor imaging; Ventricular myocardial band

引用本文: 张涛,高长青,李力兵等. 使用磁共振弥散张量成像技术对心肌带结构的初步研究. 中国胸心血管外科临床杂志, 2007, 14(6): 443-. doi: 复制

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