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Modelling passive diastolic mechanics with quantitative MRI of cardiac structure and function.

机译:用定量核磁共振成像对心脏结构和功能进行被动舒张力学建模。

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摘要

The majority of patients with clinically diagnosed heart failure have normal systolic pump function and are commonly categorized as suffering from diastolic heart failure. The left ventricle (LV) remodels its structure and function to adapt to pathophysiological changes in geometry and loading conditions, which in turn can alter the passive ventricular mechanics. In order to better understand passive ventricular mechanics, a LV finite element (FE) model was customized to geometric data segmented from in vivo tagged magnetic resonance images (MRI) data and myofibre orientation derived from ex vivo diffusion tensor MRI (DTMRI) of a canine heart using nonlinear finite element fitting techniques. MRI tissue tagging enables quantitative evaluation of cardiac mechanical function with high spatial and temporal resolution, whilst the direction of maximum water diffusion in each voxel of a DTMRI directly corresponds to the local myocardial fibre orientation. Due to differences in myocardial geometry between in vivo and ex vivo imaging, myofibre orientations were mapped into the geometric FE model using host mesh fitting (a free form deformation technique). Pressure recordings, temporally synchronized to the tagging data, were used as the loading constraints to simulate the LV deformation during diastole. Simulation of diastolic LV mechanics allowed us to estimate the stiffness of the passive LV myocardium based on kinematic data obtained from tagged MRI. Integrated physiological modelling of this kind will allow more insight into mechanics of the LV on an individualized basis, thereby improving our understanding of the underlying structural basis of mechanical dysfunction under pathological conditions.
机译:临床诊断为心力衰竭的大多数患者的收缩泵功能正常,通常被归类为舒张性心力衰竭。左心室(LV)重塑其结构和功能,以适应几何和负荷条件下的病理生理变化,进而改变被动心室力学。为了更好地了解被动心室力学,对LV有限元(FE)模型进行了定制,以对从体内标记的磁共振图像(MRI)数据和源自犬离体扩散张量MRI(DTMRI)的肌纤维方向进行分割的几何数据心脏使用非线性有限元拟合技术。 MRI组织标记能够以高空间和时间分辨率对心脏机械功能进行定量评估,而DTMRI的每个体素中最大水扩散的方向直接对应于局部心肌纤维的方向。由于体内和体外成像之间心肌几何结构的差异,使用宿主网格拟合(自由形式变形技术)将肌纤维的方向映射到几何有限元模型中。在时间上与标签数据同步的压力记录被用作模拟舒张期左心室变形的负荷约束。舒张压左心室力学的模拟使我们能够基于从带标签的MRI获得的运动学数据来估计被动性左心室心肌的刚度。这种集成的生理学模型将使您可以在个性化的基础上更深入地了解LV的力学原理,从而提高我们对病理条件下机械功能障碍的潜在结构基础的理解。

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