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A, A 53-year-old woman after polytrauma. Sagittal 2.50 mm image of standard-dose 16-MDCT examination (120 kV and fixed 250 mAs) shows fracture at the base of the dens of C2 (arrow). Calculated effective at examination is 3.9 mSv. B, A 62-year-old man after polytrauma. Sagittal 2.5-mm image of low-dose 16-MDCT examination (100 kV and 141 mAs, after tube current modulation) shows fracture at the base of the dens of C2 (arrow). Calculated effective dose is 1.4 mSv.
