For placement of regions of interest (ROI), proton density-weighted fast spin echo images were evaluated by a radiologist (initials blinded) to determine three regions (in medial and lateral facets, and the apex) showing strong magic angle effect (A), and rectangular ROI, 4 mm wide by ~full thickness divided into superficial and deep halves, were then placed in the selected regions on 2D and 3D T1ρ MR images (B).