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Fig. 3B —Calculation of occupation ratio by sonography in healthy 50-year-old man (no atrophy or fatty infiltration of supraspinatus). SS = supraspinatus muscle, t = trapezius muscle. At notch (arrows), transducer is rotated 90°, reproducing Y (sagittal oblique) view of MRI. Ellipse tool on sonography unit was used to calculate occupation ratio in same fashion as for MRI. C = clavicle, Sc = scapular spine.