Joint reconstruction of 2-D left ventricular displacement and contours from tagged magnetic resonance images using Markov random field edge prior

L. Yan, T. Denney
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引用次数: 3

Abstract

Magnetic Resonance (MR) tagging has been shown to be a useful method for non-invasively measuring the deformation of the left ventricle (LV), during the cardiac cycle. By reconstructing a displacement field based on the movement of the tag lines, one can compute myocardial contraction measures such as strain. Existing methods depend on user-defined LV contours, which require human intervention and are therefore the biggest bottleneck in the reconstruction process. Here, the authors present a method for reconstructing 2-D LV deformation without user-defined contours. They use a compound Gauss-Markov random field to model the 2-D vector displacement field, which is parameterized by two closed and smooth contours. By iteratively optimizing the contours, the displacement field, and the parameters, the authors obtain an estimate of the displacement field and the contours. Experimental results on in vivo human data are presented that demonstrate the accuracy of the authors' algorithm.
利用马尔科夫随机场边缘先验对标记磁共振图像进行二维左心室位移和轮廓联合重建
磁共振(MR)标记已被证明是一种有用的方法非侵入性测量左心室(LV)的变形,在心脏周期。通过重建基于标签线运动的位移场,可以计算心肌收缩措施,如应变。现有方法依赖于用户自定义的低压轮廓,需要人工干预,因此是重建过程中最大的瓶颈。在这里,作者提出了一种不需要用户定义轮廓的二维LV变形重建方法。他们使用复合高斯-马尔可夫随机场来模拟二维矢量位移场,该矢量位移场由两个封闭的光滑轮廓参数化。通过对等高线、位移场和参数的迭代优化,得到了位移场和等高线的估计。在人体数据上的实验结果证明了作者算法的准确性。
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