Table 6.

Gamma analysis of dose profiles for different field sizes at 10-cm depth

Field size (cm2)	Average gamma index inside the field		Average gamma index in penumbra region		Average gamma index outside the field		Percentage of points passing the criteria (2%, 2 mm)
	Transverse	Longitudinal	Transverse	Longitudinal	Transverse	Longitudinal	Transverse	Longitudinal
4×4	0.37	0.33	0.64	0.54	0.05	0.08	98.66	98.24
6×6	0.38	0.32	0.6	0.49	0.05	0.07	97.83	98.03
8×8	0.22	0.28	0.57	0.36	0.09	0.12	97.57	97.32
10×10	0.24	0.21	0.57	0.66	0.17	0.55	98.72	98.96
15×15	0.31	0.25	0.5	0.52	0.32	0.36	99.56	99.18
20×20	0.53	0.56	0.51	0.49	0.37	0.32	96.05	96.02
30×30	0.58	0.63	0.63	0.68	0.47	0.52	95.86	95.39