Appendix 2.

Organ-specific radiation dose estimates (mGy) from a single CT colonography screen

a) Females
	Manufacturer and CT scanner
	GE	GE	Siemens	Siemens	Toshiba	Toshiba	Philips	Philips	Philips
	16	64	16	64	16	64	16	40	16
Organ	Slice	Slice	Slice	Slice	Slice	Slice	Slice	Slice	Slice	Mean
Stomach	15	14	13	10	17	16	11	9	8	13
Colon	14	13	12	10	16	15	10	8	8	12
Liver	14	14	12	10	17	16	10	9	8	12
Pancreas	12	12	11	8	14	14	9	7	7	10
Lung	2	3	2	2	3	6	2	2	2	3
Breast	1	1	1	1	1	5	1	1	1	1
Ovary/uterus	14	13	12	9	16	14	10	8	7	11
Bladder	15	14	13	10	17	16	11	9	8	12
Kidney	16	15	13	11	18	17	11	9	8	13
Bone marrow	7	7	6	5	8	8	5	4	4	6
Effective Dose (mSv)	10	9	8	7	11	11	7	6	5	8

b) Males
	Manufacturer and CT scanner
	GE	GE	Siemens	Siemens	Toshiba	Toshiba	Philips	Philips	Philips
	16	64	16	64	16	64	16	40	16
Organ	Slice	Slice	Slice	Slice	Slice	Slice	Slice	Slice	Slice	Mean
Stomach	15	14	12	10	17	16	10	9	8	12
Colon	14	13	12	9	16	14	10	8	7	11
Liver	14	13	12	9	16	15	10	8	8	12
Pancreas	11	11	10	8	13	13	8	7	6	10
Lung	2	2	2	1	3	5	1	1	2	2
Prostate	4	9	5	5	9	15	3	5	7	7
Bladder	14	13	12	9	16	15	10	8	8	12
Kidney	15	14	13	10	17	16	11	9	8	13
Bone marrow	6	6	5	4	7	7	5	4	4	5
Effective Dose (mSv)	7	8	6	5	9	10	5	5	5	7