Table 3.
Derived estimates of mean, minimum and maximum values of incident air kerma (mGy) by time period, imaging protocol and compressed breast thickness (CBT) (all estimates presented to two significant digits).
| Period | Protocol | CBT | Incident Air Kerma (mGy) |
||
|---|---|---|---|---|---|
| (cm) | Mean | minimum | maximum | ||
| 1960–1964 | Egan | 3 | 36 | 4.2 | 120 |
| 5 | 41 | 6.4 | 140 | ||
| 8 | 51 | 4 | 310 | ||
| Gershon-Cohen | 3 | 7.1 | 1.2 | 29 | |
| 5 | 13 | 2.1 | 51 | ||
| 8 | 21 | 2.4 | 120 | ||
| 1965–1969 | Egan | 3 | 29 | 4.4 | 120 |
| 5 | 49 | 3.7 | 210 | ||
| 8 | 74 | 2.4 | 500 | ||
| 1970–1974 | Egan | 3 | 27 | 0.28 | 350 |
| 5 | 30 | 0.43 | 300 | ||
| 8 | 42 | 0.59 | 540 | ||
| 1975–1979 | Typical (non-screen) | 3 | 17 | 0.24 | 160 |
| 5 | 30 | 0.36 | 290 | ||
| 8 | 50 | 0.50 | 700 | ||
| Xeroradiography | 3 | 9.0 | 0.39 | 85 | |
| 5 | 16 | 0.59 | 150 | ||
| 8 | 27 | 0.81 | 370 | ||
| Screen-Film (Low-Dose) |
3 | 3.5 | 0.21 | 48 | |
| 5 | 6.2 | 0.32 | 85 | ||
| 8 | 10 | 0.44 | 210 | ||
| 1980–1984 | Xeroradiography | 3 | 7.4 | 1.2 | 18 |
| 5 | 13 | 1.8 | 32 | ||
| 8 | 23 | 2.5 | 79 | ||
| Screen-Film (Low-Dose) |
3 | 5.0 | 0.78 | 15 | |
| 5 | 9.0 | 1.2 | 27 | ||
| 8 | 15 | 1.6 | 66 | ||
| 1985–1989 | Xeroradiography | 3 | 4.3 | 0.2 | 13 |
| 5 | 7.7 | 0.29 | 22 | ||
| 8 | 13 | 0.41 | 47 | ||
| Screen-Film (Low-Dose) |
3 | 4.3 | 0.080 | 22 | |
| 5 | 7.8 | 0.12 | 40 | ||
| 8 | 13 | 0.17 | 83 | ||
| 1990–1999 | Xeroradiography | 3 | 4 | 0.59 | 8.8 |
| 5 | 7.1 | 0.90 | 17 | ||
| 8 | 12 | 1.23 | 39 | ||
| Screen-Film (Low-Dose) |
3 | 4.1 | 0.22 | 20 | |
| 5 | 7.5 | 0.33 | 35 | ||
| 8 | 13 | 0.46 | 74 | ||
| 2000- | Screen-Film (Low-Dose) | 3 | 5.0 | 1.2 | 14 |
| 5 | 11 | 2.4 | 25 | ||
| 8 | 19 | 3.3 | 58 | ||