Table 5 Open fields: summary of main parameters from profile analysis; data are shown for three exemplifying field sizes.
From: Testing the portal imager GLAaS algorithm for machine quality assurance
Field/axis | Dmin * [%] | Dmax * [%] | Dave * [%] | Flatness [%] | Symmetry [%] | |
|---|---|---|---|---|---|---|
5 × 5, y | Ion chamber | 93.6 | 100.0 | 98.8 | 3.3 | 100.4 |
Eclipse | 93.9 | 100.1 | 99.6 | 3.2 | 100.0 | |
GLAaS | 96.2 | 100.8 | 100.1 | 2.3 | 100.1 | |
10 × 10, y | Ion chamber | 98.8 | 100.8 | 100.2 | 1.0 | 100.5 |
Eclipse | 100.0 | 100.9 | 100.4 | 0.4 | 100.0 | |
GLAaS | 100.0 | 101.5 | 100.8 | 0.8 | 100.0 | |
20 × 20, y | Ion chamber | 99.9 | 102.7 | 101.7 | 1.4 | 100.6 |
Eclipse | 100.0 | 102.2 | 101.4 | 1.1 | 100.1 | |
GLAaS | 99.9 | 103.4 | 101.6 | 1.7 | 101.2 | |
5 × 5, x | Ion chamber | 94.7 | 100.3 | 99.0 | 2.9 | 100.4 |
Eclipse | 93.9 | 100.1 | 99.6 | 3.2 | 100.0 | |
GLAaS | 97.7 | 100.1 | 99.4 | 1.2 | 100.0 | |
10 × 10, x | Ion chamber | 99.2 | 101.0 | 100.3 | 0.9 | 100.6 |
Eclipse | 100.0 | 100.9 | 100.4 | 0.4 | 100.1 | |
GLAaS | 99.3 | 100.6 | 100.1 | 0.7 | 100.0 | |
20 × 20, x | Ion chamber | 99.7 | 102.6 | 101.4 | 1.4 | 100.4 |
Eclipse | 100.0 | 102.2 | 101.4 | 1.1 | 100.1 | |
GLAaS | 99.7 | 102.5 | 101.3 | 1.4 | 100.2 |