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Fig. 1A —Calculation of occupation ratio by MRI in two shoulders. Two methods were used in each shoulder: using either lines (A and C) or ellipse tool (B and D) on PACS console to outline contours of supraspinatus muscle and those of its fossa, as shown on these sagittal oblique T1-weighted images. Normal supraspinatus muscle (no atrophy) in 56-year-old woman. Using lines, occupation ratio is 3.45/5.61 cm² = 0.61.