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Fig. 1D —Representative color-coded T2 maps. Color-coded T2 maps of intervertebral disks obtained with axial T2 mapping classification system show grade I in 23-year-old woman (A), grade II in 27-year-old man (B), grade III in 25-year-old man (C), and grade IV in 34-year-old man (D). Change of T2, loss of homogeneity in signal intensity, and loss of distinction between nucleus pulposus and annulus fibrosus were generally observed in degenerative intervertebral disks.