Table 2.

Form and parameters of dose rate regression functions.

Beam	Frame Rate	Gain	Form	Parameters
				A	B
6 MV
	10 fps
		18 dB	Linear1	0.002	0.124
		20 dB	Linear	0.002	0.009
		22 dB	Linear	0.002	0.022
	20 fps
		20 dB	*	*	*
		22 dB	*	*	*
6 MV FFF
	10 fps
		18 dB	Exponential2	0.560	−2.634
		20 dB	Exponential	0.326	−1.210
		22 dB	Exponential	0.146	−0.163
	20 fps
		18 dB	Linear	0.002	0.024
		20 dB	Linear	0.002	0.110
		22 dB	Exponential	0.879	−4.590
10 MV FFF
	10 fps
		18 dB	Exponential	1.094	−5.904
		20 dB	Exponential	0.796	−4.024
		22 dB	Exponential	0.582	−2.728
	20 fps
		18 dB	Linear	0.002	0.090
		20 dB	Linear	0.002	0.081
		22 dB	Linear	0.001	0.191

* Measurements could only be acquired at 600 MU/min. No regression function needed.

¹Linear regression functions were of the form: $y=A\times x+B$.

²Exponential regression functions were of the form: $y=A\times ln(x)+B$.