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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

FIG. 4.

FIG. 4

FIG. 4

Output factors of 4×4, 6×6, 8×8, 10×10, 12×12, and 15×15cm2 fields for all photon energies (6MV, 10MV and 15MV WFF, 6MV and 10MV FFF) measured with EPID and an ion chamber. The ion chamber measurement depth is 1.5 cm for 6MV and 6MV FFF, 2.5 cm for 10MV and 10MV FFF, 3.0 cm for 15MV.