Table 2 Statistical comparison of the tested linacs for the average and largest range of deviations, and the maximum standard deviations of the results (worst reproducibility) over each of the tested components
Average range | Largest range | Worst reproducibility | ||
|---|---|---|---|---|
EPID Sag (mm) | Cross-plane | 0.17 | 0.32 (L#11) | 0.04 (L#11) |
In-plane | 1.00 | 2.68 (L#7) | 0.08 (L#10) | |
Gantry Sag (mm) | Cross-plane | 0.42 | 0.63 (L#11) | 0.10 (L#10) |
In-plane | 0.72 | 0.82 (L#12) | 0.15 (L#8) | |
SDD (mm) | 3.57 | 8.65 (L#11) | 1.15 (L#2) | |
EPID and Collimator Skew (degrees) | 0.15 | 0.17 (L#9) | 0.09 (L#3) | |
EPID Tilt (degrees) | Cross-plane | 0.02 | 0.04 (L#10) | 0.01 (L#7) |
In-plane | 0.06 | 0.13 (L#11) | 0.05 (L#11) | |
MLC Sag (mm) | Left | 0.62 | 0.82 (L#8) | 0.17 (L#3) |
Right | 0.68 | 0.99 (L#8) | 0.15 (L#3) | |
Gun | 0.34 | 0.57 (L#11) | 0.16 (L#6) | |
Target | 0.32 | 0.61 (L#10) | 0.10 (L#3) |