Table 2 Dosimetric constancy checks: MPC and independent checks for all evaluated parameters, all energies
From: Evaluation of the Machine Performance Check application for TrueBeam Linac
Parameter | Check | Thresh | 6MV | 10MV | 15MV | 6MV FFF | 10MV FFF |
|---|---|---|---|---|---|---|---|
BEAM | |||||||
Output Change [%] | MPC | ±2.0 | 0.15 ± 0.13 | 0.10 ± 0.29 | 0.06 ± 0.15 | 0.24 ± 0.24 | 0.22 ± 0.16 |
Output Change [%] | Indep | 0.4 ± 0.4 | 0.4 ± 0.5 | 0.3 ± 0.6 | −0.1 ± 0.4 | 0.5 ± 0.3 | |
Uniformity Change [%] | MPC | ±2.0 | 0.77 ± 0.20 | 0.92 ± 0.13 | 0.94 ± 0.21 | 0.88 ± 0.19 | 0.89 ± 0.12 |
Uniformity Change [%] | Indep | −0.1 ± 0.1 | −0.2 ± 0.2 | 0.4 ± 0.3 | 0.1 ± 0.1 | 0.1 ± 0.1 | |
Center Shift [mm] | MPC | ±0.5 | 0.04 ± 0.02 | 0.04 ± 0.01 | 0.04 ± 0.01 | 0.15 ± 0.02 | 0.09 ± 0.02 |