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Figure 2b. Sequential transverse fast gradient-echo 1.5-T cine MR images (8.2/3.6; flip angle, 80°; section thickness, 12 mm; field of view, 24 cm; in-plane resolution, 256 x 256) obtained at level of hypopharynx in 2-month-old boy with OSA. Area marked with white line indicates region of interest around airway used for volume segmentation. (a) Left: Image obtained during one point of respiratory cycle shows patent hypopharynx. Right: Volume segmentation data image, with gray area that represents patent airway. (b) Left: Sequential image obtained over time shows collapsed airway. Right: Volume segmentation data image with little to no gray area, which is consistent with collapse.
