Table 10.

Gamma analysis passing rates (%), measured vs. calculated, for VMAT plans optimized with 4° CP spacing and calculated on a 3 mm grid that we typically use in our clinic.

	${\mathit{\text{Delta}}}^4$		ArcCHECK
Plan	$\gamma (3,3)\le 1$	$\gamma (2,2)\le 1$	$\gamma (3,3)\le 1$	$\gamma (2,2)\le 1$
Prostate	100	99.6	98.8	94.6
Multi‐target	100	99.2	97.8	90.4
H&N, 1 Arc	98.7	92.9	96.4	87.3
H&N, 2 Arcs	99.9	94.8	95.6	86.5
C‐Shape, 1 Arc	99.7	97.1	97.6	89.3
C‐Shape, 2 Arcs	100	99.7	97.2	89.6
Average	99.7	97.2	97.2	89.6