Distribution of myocardial strains: an MRI study.
Distribution of myocardial strains: an MRI study.
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心肌张力的分布：MRI 研究。
DOI：
10.1007/978-1-4615-1893-8_31
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发表时间：
1995
影响因子：
--
通讯作者：
Shapiro,EP
中科院分区：
文献类型：
--
作者：
Azhari,H;Weiss,JL;Shapiro,EP
心肌应变的量化对于理解心脏力学是必不可少的。以前用于评估局部心肌应变的技术主要限于侵入性程序。最近引入了一种技术，通过该技术可以将标记添加到磁共振图像（MRI）中，并且允许对心肌变形进行无创测量。我们应用MRI标记两套正交的平面，并获得了三维（3D）重建的24个心肌长方体在终末舒张期（艾德）和终末收缩期（ES）。应用有限应变分析这些长方体，我们能够研究的纵向分布的心内膜和心外膜主应变（PS）在正常犬心脏。此外，我们已经计算了纵向分布的左心室（LV）透壁增厚使用3D方法。我们的研究结果表明，在纵向分布的内皮PS和透壁增厚的相似性。这些结果表明，内皮细胞的降雨量不仅决定于内皮细胞纤维的变形，但主要是通过透壁增厚的几何耦合。
Quantification of myocardial strains is essential for understanding cardiac mechanics. Previous techniques for assessing regional myocardial strains have been mainly limited to invasive procedures. A technique by which tagging can be added to magnetic resonance images (MRI) has recently been introduced and allows for noninvasive measurement of myocardial deformations. We have applied MRI tagging to two sets of orthogonal planes and have obtained three dimensional (3D) reconstructions of 24 myocardial cuboids at end-diastole (ED) and at end-systole (ES). Applying finite strain analysis to these cuboids we were able to study the longitudinal distribution of the endocardial and epicardial principal strains (PS) in the normal canine heart. In addition we have calculated the longitudinal distribution of the left ventricular (LV) transmural thickening using a 3D approach. Our results show similarity in the longitudinal distribution of endocardial PS and transmural thickening. These results imply that endocardial s rains are determined not only by endocardial fiber deformations but mainly by geometrical coupling through transmural thickening.