Large (uncollimated), uniform field condition: brain absorbed dose of radiation and relative risk of developing brain tumors as a function of patient age
| Age, y | MSD, Both Planes, mGy | SD, Both Planes, mGy | Brain Dose–to–MSD Conversion Factor | Brain-Absorbed Dose, mGy | Projected Risk of Developing Brain Tumors (×Baseline) |
|---|---|---|---|---|---|
| <1 | 372.9 | 361.2 | 0.48 | 164.4 | 4.8 |
| 1–2 | 443.5 | 434.4 | 0.38 | 160.0 | 4.7 |
| 3–7 | 383.3 | 398.9 | 0.30 | 93.3 | 3.2 |
| 8–12 | 355.3 | 341.9 | 0.25 | 74.1 | 2.7 |
| 13–17 | 521.3 | 529.7 | 0.24 | 103.9 | 3.4 |
| 18–21 | 583.5 | 729.3 | 0.23 | 106.3 | 3.4 |
| All ages | 422.7 | 440 | 0.25 | 90.1 | 3.1 |
Note:—Projected risk is calculated as (excess relative risk = 0.023/mGy)+1.
SD indicates standard deviation (inter-patient variability).