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Spatio-temporal directional filtering for improved inversion of MR elastography images.

机译:时空定向滤波可改善MR弹性成像图像的反演。

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摘要

Dynamic magnetic resonance elastography can visualize and measure propagating shear waves in tissue-like materials subjected to harmonic mechanical excitation. This allows the calculation of local values of material parameters such as shear modulus and attenuation. Various inversion algorithms to perform such calculations have been proposed, but they are sensitive to areas of low displacement amplitude (and hence low SNR) that result from interference patterns due to reflection and refraction. A spatio-temporal directional filter applied as a pre-processing step can separate interfering waves so they can be processed separately. Weighted combinations of inversions from such directionally separated data sets can significantly improve reconstructions of shear modulus and attenuation.
机译:动态磁共振弹性成像可以可视化和测量经受谐波机械激励的组织状材料中传播的剪切波。这样可以计算材料参数的局部值,例如剪切模量和衰减。已经提出了执行这种计算的各种反演算法,但是它们对由反射和折射引起的干涉图案所导致的低位移幅度(因此SNR较低)的区域敏感。用作预处理步骤的时空定向滤波器可以分离干扰波,因此可以分别进行处理。来自这种方向分离的数据集的反演的加权组合可以显着改善剪切模量和衰减的重构。

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