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MR elastographic wave propagation. (a) Transverse T2-weighted image shows lumbar spine of a 35-year-old man, with red line delineating IVD region of interest (ROI). (b) Phase images show wave propagation through IVD in the x, y, and z direction. (c) Schematic shows segmented ROI of nucleus pulposus (AF) and annulus fibrosus (NP) regions.
