| Radiation dose class (Gy) | Number of regions | Number of regions with microbleeds | Frequency of microbleeds (%) |
| Over 55 | 8 | 6 | 75 |
| 45–55 | 11 | 7 | 63.6 |
| 35–45 | 11 | 3 | 27.2 |
| 25–35 | 11 | 3 | 27.2 |
| 15–25 | 11 | 0 | 0 |
| 5–15 | 11 | 0 | 0 |
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