Table 1.

DRS model discrepancies between the reference data and calculation for the default beam model and the final customized model for the Varian base class. Reference dosimetric parameters were determined previously.⁸

PDD			Jaw Output Factor
	Default	Tuned		Default	Tuned
5 cm	−0.1%	−0.1%	6×62 cm	0.9%	0.2%
10 cm	−0.2%	−0.2%	15×15 cm2	−0.3%	0.0%
15 cm	0.6%	0.2%	20×20 cm2	−0.2%	0.0%
20 cm	0.3%	−0.8%	30×30 cm2	0.3%	−0.1%

IMRT - style Output Factors			SBRT - style Output Factors
	Default	Tuned		Default	Tuned
6×6 cm2	0.4%	0.1%	6×6 cm2	1.0%	0.0%
4×4 cm2	−0.3%	−0.8%	4×4 cm2	1.3%	−0.1%
3×3 cm2	−0.2%	−0.8%	3×3 cm2	1.7%	0.0%
2×2 cm2	−0.7%	−1.2%	2×2 cm2	2.1%	−0.4%

Off - Axis Factors
	Default	Tuned
5 cm	−0.6%	−0.1%
10 cm	−0.2%	0.0%
15 cm	−0.4%	0.0%