Table 5. Doses for tissues and organs positioned within and at the boundaries of the scan length in adult and paediatric abdominopelvic CT examinations with CT scanner A.

	Adult CT				Paediatric CT
Tube voltage (kV)	120	120	120	120	120	120	120	120
Rotation time (s rotation–1)	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
Beam width (mm)	1.0 mm × 16	1.0 mm × 16	1.0 mm × 32	1.0 mm × 32	1.0 mm × 16	1.0 mm × 16	1.0 mm × 32	1.0 mm × 32
Pitch factor	0.938	1.438	0.844	1.406	0.938	1.438	0.844	1.406
Effective mAs	100	100	100	100	50	50	50	50
Planned scan length (mm)	440	440	440	440	260	260	260	260
Exposed scan length (mm)	475	491	499	535	295	311	319	355
Tissue or organ	Organ dose (mGy)				Organ dose (mGy)
Lung	5.9	6.7	6.8	7.7	5.4	6.1	5.4	6.3
Breast	3.1	10.1	8.1	10.4	1.9	2.5	5.2	6.6
Oesophagus	7.4	7.6	7.3	7.6	4.6	5.0	4.8	5.4
Liver	13.7	13.4	13.5	12.6	10.7	11.2	9.6	10.8
Stomach	16.0	13.5	14.5	16.9	11.3	11.8	10.3	9.9
Colon	15.5	14.9	14.4	13.8	11.2	11.3	10.5	11.0
Ovaries	15.8	16.1	14.7	12.8	9.1	9.2	8.7	8.9
Bladder	14.9	15.5	15.2	13.4	9.3	8.5	9.3	9.4
Testes	4.1	6.6	8.6	17.1	2.0	2.5	3.4	7.0