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| Dose errors | MLC errors (mm) | Gantry Angle errors (˚) | Col Angle errors (˚) | |||||||||||||||
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| −1% | −3% | −5% | 1% | 3% | 5% | −0.25 | −0.5 | 0.25 | 0.5 | 1.5 | 2.5 | 1 | 2 | 3 | 1 | 4 | ||
3D Gamma index | 100 | 97.4 | 93.4 | 100 | 98.4 | 94.3 | 100 | 97.4 | 100 | 98.0 | 78.2 | 66.8 | 99.9 | 98.6 | 95.5 | 100 | 100 | ||||
Average 3D gamma | PTV | 0.45 | 1.3 | 1.58 | 0.44 | 1.15 | 1.53 | 0.52 | 1 | 0.49 | 0.93 | 1.59 | 1.60 | 0.14 | 0.23 | 0.31 | 0.03 | 0.05 | |||
Rt Parotid | 0.14 | 0.32 | 0.42 | 0.14 | 0.28 | 0.4 | 0.29 | 0.43 | 0.29 | 0.42 | 1 | 1.34 | 0.22 | 0.32 | 0.43 | 0.02 | 0.03 | ||||
Lt Parotid | 0.19 | 0.35 | 0.45 | 0.18 | 0.32 | 0.41 | 0.33 | 044 | 0.33 | 0.47 | 1.09 | 1.37 | 0.29 | 0.41 | 0.55 | 0.03 | 0.04 | ||||
Cord | 0.15 | 0.42 | 0.61 | 0.16 | 0.38 | 0.61 | 0.33 | 0.57 | 0.33 | 0.58 | 1.28 | 1.43 | 0.15 | 0.24 | 0.33 | 0.03 | −0.15 | ||||
% difference | PTV | D95 | −1.06 | −3.24 | −4.92 | 0.98 | 2.96 | 5.11 | −1.36 | −2.74 | 1.23 | 2.56 | 7.06 | 11.33 | −0.21 | −0.57 | −0.93 | −0.07 | −0.15 | ||
Cord | Dmax | −1.4 | −3.09 | −5.06 | 1.15 | 2.71 | 4.85 | −2.15 | −4.42 | 2.18 | 4.61 | 14.16 | 24.94 | 0.4 | 0.98 | 2.14 | 0.09 | 0.03 | |||
Rt Parotid | D50 | −1.03 | −3.4 | −5.37 | 1.06 | 2.75 | 4.93 | −4.7 | −9.59 | 4.54 | 9.59 | 31.11 | 54.5 | 2.62 | 6.82 | 10.68 | 0.1 | −0.15 | |||
Lt Parotid | D50 | −1.21 | −2.72 | −4.74 | 1.08 | 2.99 | 4.6 | −4.14 | −7.81 | 4.76 | 9.47 | 31.4 | 54 | −2.28 | −2.7 | −3.64 | 0.42 | −0.1 | |||