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.