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Fig. 1A —36-year-old man with healthy knee. Representative lateral parasagittal MR images from IDEAL–SPGR (A–C) and fat-saturated SPGR (D) acquisitions with equal acquired resolution and imaging times. IDEAL–SPGR acquisition provides fat only (C) and combined fat–water images (A) in addition to water images (B). This capability improves signal-to-noise ratio and markedly improves cartilage–fluid contrast compared with that of equivalent fat-saturated SPGR image (D).