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Fig. 1B —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. Using ellipse method in same shoulder as in
A, occupation ratio is 3.41/5.72 cm2 = 0.60.
