From: Design and evaluation of electron beam energy degraders for breast boost irradiation
 | A/P ratio | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Energy | Cone size (cm2) | 0.75 | 1.00 | 1.25 | 1.50 | 1.75 | 2.00 | 2.25 | 2.50 | 3.00 | 3.75 |
7 MeV | 10 × 10 | 0.335 | 0.490 | 0.623 | 0.738 | 0.805 | 0.858 | 0.870 | 0.882 | - | - |
15 × 15 | - | - | - | - | - | 0.900 | 0.922 | 0.946 | 0.963 | 0.972 | |
9 MeV | 10 × 10 | 0.903 | 0.952 | 0.983 | 1.000 | 1.005 | 1.008 | 1.004 | 1.000 | - | - |
15 × 15 | - | - | - | - | - | 1.003 | 1.005 | 1.007 | 1.004 | 0.996 |