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Fig. 6 —Mean entrance exposure for survey CT scans at minimum X-ray tube current indicated for each scanner model. Horizontal dotted line marks exposure from one typical chest X-ray (16 mR or 4.1 x 10^-6 C/kg). Whenever available, 120 kVp and 80 kVp X-ray tube voltages were used. For two CT scanner models (Philips PQ5000 and Philips Ultra Z), only 130 kVp X-ray tube voltage was available for survey CT scans. For one CT scanner model (Philips Mx8000 IDT 16), only 120 kVp and a 0° tube position were available.