Table 6.

Quantification of the effect of TPS angle discretization (2°, 4° and 6° angular CP spacing) when estimating continuous, full rotation simple 2 cm‐wide arc. All values are in passing rates (%, calculated vs. calculated) with global normalization dose equal to the maximum dose in the corresponding subvolume and a lower threshold dose of 10% of the normalization dose.

	100% Norm		$6^0-2^0$			$4^0-2^0$
ROI Analyzed	Dose (Gy)	$\gamma (3/3)\le 1$	$\gamma (2/2)\le 1$	$\gamma (1/1)\le 1$	$\gamma (3/3)\le 1$	$\gamma (2/2)\le 1$	$\gamma (1/1)\le 1$
1 cm Diameter Cylinder	4.375	100	100	94.4	100	100	100.0
3 cm Diameter Cylinder	4.375	100	99.9	84.6	100	100	96.7
5 cm Diameter Cylinder	4.375	100	100	94.0	100	100	98.9
10 cm Diameter Cylinder	4.375	100	100	98.4	100	100	99.7
ArcCHECK Detector Surface	0.430	56.5	51.3	42.3	70.2	58.5	43.5