Improved inversion of MR elastography images by spatiotemporal directional filtering

Armando Manduca; David S. Lake; Richard L. Ehman

doi:10.1117/12.483589

15 May 2003 Improved inversion of MR elastography images by spatio-temporal directional filtering

Armando Manduca, David S. Lake, Richard L. Ehman

Author Affiliations +

Proceedings Volume 5032, Medical Imaging 2003: Image Processing; (2003) https://doi.org/10.1117/12.483589
Event: Medical Imaging 2003, 2003, San Diego, California, United States

Abstract

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.

Citation Download Citation

Armando Manduca, David S. Lake, and Richard L. Ehman "Improved inversion of MR elastography images by spatio-temporal directional filtering", Proc. SPIE 5032, Medical Imaging 2003: Image Processing, (15 May 2003); https://doi.org/10.1117/12.483589

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