Fig. 4

a Sagittal fat-suppressed proton density-weighted image shows a preserved signal intensity of the articular cartilage of the posterior aspect of the medial femoral condyle with uniform cartilage thickness (blue arrow). b and c Corresponding sagittal T2 map shows a region of increased T2 relaxation time [false positive] (ROI). b: 0 ms ≤ T2 ≤ 39 ms; c: T2 = 66 ms)