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. Author manuscript; available in PMC: 2018 Dec 3.
Published in final edited form as: Arch Intern Med. 2009 Dec 14;169(22):2071–2077. doi: 10.1001/archinternmed.2009.440

Table 1. Mean Lifetime Cancer Risk per 10 000 CT Scans,a According to CT Scan Type and Age at Exposure.

Age at
Exposure, y
Type of CT Scan
Spine
Abdomen
and
Pelvis
CTA
Whole
Body
CTC CAC
Head Chest Cervical Lumbar Thoracic Chest Head Abdomen Pelvis
Females
3 8 40 70 20 70 20 NA NA NA NA 60 NA NA
15 4 30 50 10 40 20 60 30 20 20 40 10 10
30 2 10 5 7 10 10 20 4 10 10 20 6 5
50 1 7 2 6 9 8 10 2 9 8 10 5 3
70 1 3 1 2 3 3 5 1 4 3 5 3 1
Males
3 9 10 10 20 20 20 NA NA NA NA 30 NA NA
15 5 9 10 10 8 20 20 10 20 10 20 10 2
30 3 5 3 7 5 10 8 5 10 5 10 6 1
50 2 4 2 6 4 9 8 3 10 3 10 5 1
70 1 3 1 4 3 5 5 2 6 2 3 3 1

Abbreviations: CAC coronary artery calcification; CT, computed tomographic; CTA, CT angiography; CTC, CT colonography; NA, pediatric protocols not available.

a

Estimated for a single-phase scan and presented to 1 significant figure.