Table 3 Open fields: average (± SD) percentage difference between GLAaS and Reference (Eclipse or ion chamber) of output factors and Dose/MU over 16 analysed square and rectangular fields, and 14 asymmetric fields.
From: Testing the portal imager GLAaS algorithm for machine quality assurance
GLAaS vs. Eclipse [%] | GLAaS vs. IonCh. [%] | Eclipse vs. IonCh. [%] | |
|---|---|---|---|
Square and rectangular fields | |||
Output factor: | -0.4 ± 0.7 [-1.3, +1.3] | -0.5 ± 0.4 [-1.1, 0.0] | -0.2 ± 0.4 [-1.3, +0.4] |
Dose/MU: | 0.8 ± 0.6 [-0.1, +2.3] | 0.6 ± 0.3 [0.0, +1.1] | -0.2 ± 0.4 [-1.4, +0.3] |
Asymmetric fields | |||
Output factor: | -0.8 ± 0.7 [-2.3, 0.0] | - | - |
Dose/MU: | -0.3 ± 0.7 [-1.7, +0.6] | - | - |