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Region of interest (ROI) locations in MR images. The upper row represents the original images, and the lower row represents the magnifications of ROI locations. (a) ROIs in longus capitis: 1, superior; and 2, inferior. (b) ROIs in pharyngeal muscles: 3, superior; 4, middle; and 5, inferior. (c) ROIs in palatal muscles: 6, tensor veli palatini; and 7, levator veli palatini. (d) ROIs in hyoid muscles: 8, genioglossus; 9, mylohyoideus; and 10, geniohyoideus.
