TABLE 6.

Dose ratio between the modified calibration and TRS‐398 using a cylindrical chamber (modified/TRS‐398_cyl), and a parallel‐plate chamber (modified/TRS‐398_{parallel‐plate}), modified calibration and TG‐51 using a cylindrical chamber (modified/TG‐51_cyl), and using a parallel‐plate chamber (modified/TG‐51_{parallel‐plate}) in multicenter radiotherapy.

Center	Energy (MeV)	Modified/ TRS‐398cyl	Modified/ TRS‐398parallel‐plate	Modified/ TG‐51cyl	Modified/ TG‐51parallel‐plate
1	6	–	1.016	–	1.006
	8	–	1.018	–	1.005
	10	0.999	1.007	1.007	0.986
	12	1.000	1.002	1.009	0.985
	18	1.000	1.004	1.011	0.991
2	4	–	1.004	–	1.003
	6	–	1.000	–	0.999
	8	–	0.981	–	0.981
	10	1.001	0.993	1.006	0.991
	15	1.001	0.990	1.008	0.989
	18	1.002	0.994	1.011	0.993
3	6	–	1.019	–	1.019
	9	–	1.005	–	1.001
	12	0.998	0.998	1.008	0.995
4	6	–	1.019	–	1.009
	9	–	1.003	–	1.004
	12	0.980	1.001	1.001	1.002
	16	1.001	0.999	1.001	0.997
	20	0.991	0.995	0.991	0.989
5	6	–	1.003	–	1.000
	9	–	0.986	–	0.982
	12	1.000	0.996	1.017	0.995
	18	1.014	1.016	1.014	1.012
	22	0.984	1.008	1.006	1.006
6	6	–	0.992	–	0.990
	9	–	1.007	–	1.004
	12	1.005	0.997	1.017	0.995
	15	1.003	1.000	1.003	0.997
	18	1.003	0.99	1.008	0.996
7	4	–	0.996	–	1.000
	6	–	0.994	–	1.002
	8	–	0.989	–	1.007
	10	0.987	0.986	1.003	1.012
	12	0.992	0.985	1.005	1.007
	15	1.009	0.995	1.007	0.995