VISTA MRI sagittal slice by RadiAnt DICOM Viewer to measure dimensions of nasal and oral pharyngeal airway spaces. HP: Hard palate; SF: Soft palate; BOT: Base of the tongue; EG: Epiglottis. Two vertical lines indicate the rostral and caudal ends of soft palate (R.SP and C.SP). Horizontal and vertical dotted lines indicate the locations of nasal and oral pharyngeal airway spaces (NP and OP), respectively.