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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: J Appl Clin Med Phys. 2016 Dec 15;18(1):9–17. doi: 10.1002/acm2.12007

TABLE I.

γ-index off-axis analysis of EPID and PTW ion chamber array measurements.

Field size [cm2] 6MV WFF γ-index pass rate (%) 6MV FFF γ-index pass rate (%)
3mm/3% 2mm/2% 1mm/1% 3mm/3% 2mm/2% 1mm/1%
4×4 100 96.3 75.4 99.5 92.5 67.9
10×10 100 99.8 87.2 99.7 97 82.2
15×15 100 99.9 92.3 100 98.8 90.2
Field size [cm2] 10MV WFF γ-index pass rate (%) 10MV FFF γ-index pass rate (%)
3mm/3% 2mm/2% 1mm/1% 3mm/3% 2mm/2% 1mm/1%
4×4 99.9 96.1 74.3 99.6 92.3 68.2
10×10 100 99.2 86.6 99.8 97.4 81.7
15×15 99.8 99.4 91.5 100 98.4 90.1
Field size [cm2] 15MV WFF γ-index pass rate (%)
3mm/3% 2mm/2% 1mm/1%
4×4 99.6 96.6 73.9
10×10 99.7 98.3 85.8
15×15 99.4 98.1 91.2