Comparative Study between Measurement Data and Treatment Planning System (TPS) in Small Fields for High Energy Photon Beams

Table 1

TPS data versus the measured values by different Ionization chambers for 6 MV.

Field area cm^2	TPS Gy	Farmer Gy	Pinpoint Gy	Semiflex Gy
1×1	0.514	0.111	0.025	0.022
2×2	0.557	0.375	0.315	0.281
3×3	0.585	0.565	0.532	0.511
4×4	0.608	0.603	0.588	0.565