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Figure 2b.  Comparison of the minimal field of view achievable with MR imaging versus that with US. (a) On the oblique coronal MR image, the minimal field of view extends medial to the glenoid cavity. Note the shelflike insertion site (arrows). (b) On the coronal (longitudinal) US image, field-of-view coverage extends to approximately the midarticular aspect of the humeral head, and the shelflike insertion is well depicted (arrows). Spatial resolution is superior to that of MR imaging.