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Fig. 2A. —MR arthrograms of shoulder in 32-year-old man with suspected gleno-humeral instability. Axial three-dimensional (3D) gradient-echo MR image obtained using fat saturation and magnetization transfer prepulses (64 sections reconstructed at 1.1-mm section thickness) shows bright injected fluid delineating anatomy of gleno-humeral capsule. Signal-to-noise ratio of injected material is 44. Magnetization transfer contrast increases contrast-to-noise ratio between injected fluid and muscle from 11.6 to 19.7