Fig. 11
From: Paediatric multi-detector row chest CT: what you really need to know
A 12-year-old child with congenital tracheal stenosis associated with complete cartilaginous ring and ‘O’-shaped trachea (in the axial plane) (a). The trachea is long with an obtuse carina angle that ends at the T6 level (MinIP image, b), whilst the stenotic tracheal length is best depicted on the sagittal MinIP image (c). Scanning parameters: 100 kV, 44 eff mAs, 180 ref mAs, 5.70 CTDIvol, 135 DLP