Table 3.
Average effective dose and select organ doses for computed tomography, by age group and examination type
| Examination type |
Effective dose (mSv) |
Organ dose (mGy) |
|||||
|---|---|---|---|---|---|---|---|
| Bone marrow |
Brain |
Eye lens |
Thyroid |
||||
| Overall and by age | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | ||
| Head/brain | 2.9 (2.8) | 9.8 (6.7) | 39.0 (14.8) | 41.7 (17.0) | 6.3 (18.0) | ||
| <1 y | 4.7 (4.5) | 14.1 (8.1) | 35.6 (18.6) | 37.7 (21.2) | 18.8 (30.8) | ||
| 1-5 y | 3.6 (2.3) | 13.3 (6.1) | 35.5 (15.3) | 37.0 (17.3) | 7.0 (13.0) | ||
| 6-10 y | 2.6 (1.5) | 9.8 (4.5) | 39.1 (13.1) | 41.0 (14.9) | 3.2 (8.2) | ||
| 11-15 y | 1.9 (0.8) | 6.2 (2.4) | 42.5 (12.9) | 46.4 (15.0) | 1.9 (1.4) | ||
| 16-21 y | 1.7 (0.6) | 4.9 (1.5) | 43.4 (10.3) | 47.8 (11.5) | 1.4 (1.2) | ||
| Maxillofacial/sinus | 0.5 (1.7) | 1.3 (4.6) | 5.9 (17.7) | 8.3 (22.1) | 1.8 (8.7) | ||
| <1 y | 1.6 (2.0) | 5.2 (3.7) | 11.0 (11.0) | 16.4 (12.0) | 11.8 (20.5) | ||
| 1-5 y | 0.9 (2.2) | 3.4 (6.4) | 8.5 (17.3) | 11.0 (19.0) | 3.9 (14.3) | ||
| 6-10 y | 0.5 (2.0) | 1.6 (6.4) | 6.6 (21.9) | 8.8 (24.4) | 1.4 (4.6) | ||
| 11-15 y | 0.5 (1.7) | 1.1 (3.4) | 6.6 (20.9) | 9.3 (27.6) | 1.5 (5.7) | ||
| 16-21 y | 0.3 (0.8) | 0.6 (1.3) | 3.8 (8.3) | 5.7 (12.1) | 1.0 (6.1) | ||
| Neck | 6.5 (3.7) | 4.1 (2.8) | 1.0 (2.3) | 0.8 (2.7) | 32.1 (17.2) | ||
| <1 y | 7.4 (5.1) | 6.2 (4.0) | 1.0 (1.2) | 1.1 (2.5) | 24.1 (9.7) | ||
| 1-5 y | 6.0 (3.4) | 4.0 (2.5) | 0.9 (1.0) | 0.7 (1.3) | 23.9 (11.6) | ||
| 6-10 y | 5.3 (1.8) | 2.7 (0.8) | 0.6 (0.2) | 0.4 (0.1) | 23.7 (6.8) | ||
| 11-15 y | 6.9 (3.9) | 3.7 (2.0) | 0.8 (0.5) | 0.5 (0.4) | 38.9 (19.0) | ||
| 16-21 y | 7.4 (3.2) | 5.0 (2.0) | 1.6 (5.7) | 1.2 (6.4) | 45.6 (20.1) | ||
| Cervical spine | 3.0 (6.6) | 3.0 (7.0) | 5.7 (10.0) | 7.5 (12.5) | 13.7 (22.0) | ||
| <1 y | 7.9 (34.3) | 12.3 (39.3) | 15.0 (52.0) | 14.2 (49.3) | 29.6 (84.7) | ||
| 1-5 y | 3.2 (3.7) | 3.4 (3.7) | 5.3 (5.6) | 6.5 (7.6) | 11.0 (11.3) | ||
| 6-10 y | 2.9 (5.5) | 2.9 (4.3) | 5.3 (7.9) | 7.7 (14.5) | 14.3 (25.8) | ||
| 11-15 y | 2.5 (2.5) | 2.1 (2.2) | 4.9 (6.3) | 6.4 (9.4) | 11.8 (11.4) | ||
| 16-21 y | 3.0 (1.9) | 2.8 (1.6) | 6.4 (3.9) | 8.6 (4.8) | 15.6 (15.5) | ||
| Bone marrow | Breast | Lung | Thyroid | ||||
|---|---|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | ||||
| Chest | 4.9 (4.0) | 2.8 (2.3) | 6.9 (6.6) | 7.6 (6.6) | 7.7 (6.2) | ||
| <1 y | 2.6 (2.0) | 2.0 (1.8) | 3.3 (2.9) | 4.0 (3.5) | 5.1 (4.5) | ||
| 1-5 y | 3.4 (3.2) | 2.4 (2.6) | 4.2 (3.9) | 5.2 (4.6) | 6.7 (6.1) | ||
| 6-10 y | 3.8 (3.3) | 2.1 (1.6) | 5.0 (5.2) | 5.6 (4.6) | 6.7 (4.9) | ||
| 11-15 y | 4.8 (3.8) | 2.6 (1.9) | 7.3 (7.8) | 8.3 (8.3) | 8.4 (6.6) | ||
| 16-21 y | 7.2 (4.5) | 3.9 (2.5) | 10.5 (7.1) | 11.1 (6.3) | 9.4 (5.9) |
| Bone marrow | Colon | Kidney | Liver | Ovaries | Testes | ||
|---|---|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | ||
| Abdomen and pelvis | 4.7 (3.1) | 3.4 (2.2) | 6.2 (5.8) | 6.3 (5.3) | 5.9 (4.4) | 5.5 (4.9) | 5.8 (6.1) |
| <1 y | 2.8 (3.9) | 1.4 (2.3) | 4.6 (6.7) | 3.6 (6.0) | 2.8 (4.4) | 5.1 (0.1) | 4.4 (8.0) |
| 1-5 y | 3.8 (2.2) | 1.9 (1.1) | 5.2 (3.5) | 5.2 (3.3) | 5.0 (3.2) | 4.4 (3.6) | 4.4 (3.4) |
| 6-10 y | 3.6 (1.8) | 2.2 (1.0) | 3.5 (3.9) | 3.9 (3.7) | 4.3 (2.9) | 2.4 (3.1) | 2.7 (4.2) |
| 11-15 y | 4.3 (2.6) | 3.2 (1.9) | 4.4 (5.3) | 4.8 (4.8) | 5.1 (3.6) | 3.9 (4.6) | 3.3 (7.2) |
| 16-21 y | 6.0 (4.0) | 4.5 (2.7) | 9.5 (6.7) | 9.2 (6.2) | 7.9 (5.5) | 8.3 (5.3) | 10.6 (6.5) |
| Lower extremity | 0.1 (0.7) | 0.1 (0.7) | |||||
| <1 y | 0.94 | 0.47 | |||||
| 1-5 y | 0.22 (0.1) | 0.15 (0.0) | |||||
| 6-10 y | 0.12 (0.5) | 0.15 (0.5) | |||||
| 11-15 y | 0.07 (0.5) | 0.08 (0.3) | |||||
| 16-21 y | 0.06 (1.1) | 0.10 (1.2) |
mGy, milliGray; mSv, milliSievert.