Table 3 MPC accuracy for all evaluated parameters
From: Evaluation of the Machine Performance Check application for TrueBeam Linac
MPC performance value | Algorithm accuracy | Measurement accuracy |
|---|---|---|
Beam – Output change [%] | - | 0.3 |
Beam – uniformity change [%] | - | 0.2 |
Beam – center shift [mm] | - | 0.04 |
Isocenter size [mm] | ±0.01 | 0.01 |
MV imager projection offset [mm] | ±0.02 | 0.03 |
kV imager projection offset [mm] | ±0.1 | 0.1 |
MLC – maximal offset leaves A/B [mm] | ±0.1 | 0.1 |
MLC – mean offset leaves A/B [mm] | ±0.02 | 0.05 |
Jaws – offset X1/X2/Y1/Y2 [mm] | ±0.05 | 0.07 |
Collimator rotation offset [°] | ±0.005 | 0.008 |
Gantry – absolute [°] | ±0.01 | 0.01 |
Gantry – relative [°] | ±0.02 | 0.02 |
Couch – lateral/longitudinal/vertical [mm] | ±0.01 | 0.04 |
Couch – rotation/pitch/roll [°] | ±0.01 | 0.01 |
Couch – rotation-induced couch shift [mm] | ±0.01 | 0.03 |