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Improved inversion of MR elastography images by spatio-temporal directional filtering

文献类型： 会议论文

第一作者： Armando Manduca

作者： Armando Manduca 1 ; David S. Lake; Richard L. Ehman; SPIE―The International Society for Optical Engineering;

作者机构： 1.Dept. of Physiology and Biophysics and Biomathematics Resource, Mayo Clinic

关键词： elasticity;elastography;shear modulus;tissue characterization;inversion algorithms;digital filters;wave propagation;shear wave

会议名称： Medical Imaging 2003:Image Processing pt.1

主办单位：

页码： 445-452

摘要： MR 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.

分类号： R3

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