Table 1.

WEPL deviation of simulation‐derived fitted values from measurements and adjusted R² for simulation‐derived calibration functions and measurements‐derived calibration functions in each of the absorption media

Beam range	Measurements in water‐equivalent plastic			Simulated in water‐equivalent plastic				Simulated in CT of water‐equivalent plastic				Simulated in patient CT
	WEPL deviation (mm)			R2	WEPL deviation (mm)			R2	WEPL deviation (mm)			R2	WEPL deviation (mm)
	Mean	σ	Max		Mean	σ	Max		Mean	σ	Max		Mean	σ	Max
10 cm	0.0	0.2	0.5	0.999	0.7	0.6	1.5	0.999	0.3	0.5	0.9	0.998	0.1	0.6	1.4
15 cm	0.0	0.3	0.9	0.999	1.6	0.5	2.4	0.999	0.1	0.6	1.5	0.998	1.8	1.2	3.4
21 cm	0.0	0.4	1.1	0.999	0.9	0.6	1.3	0.999	0.8	0.6	1.6	0.999	0.5	0.9	1.7