Table 3.

Gamma pass rates for simulated treatment plans comparing the motion compensated dose distributions to planned. All dose differences are relative to the global maximum dose. A dose threshold of 10% of the prescription dose (50 Gy) is applied to all data. Gamma analyses are 3D. The extreme locations correspond to shifts in IEC‐Y at isocenter of ± 2.0 cm and ± 1.25 cm for the 1.0‐cm and 2.5‐cm jaws, respectively.

Jaw	Position	Fixed‐Width		Synchrony
		3%, 2 mm a	1%, 1 mm	3%, 2mm a	1%, 1 mm
2.5 cm	Negative extreme	100	94.67	100	99.20
	Positive extreme	100	94.44	100	98.70
1.0 cm	Negative extreme	62.16	48.11	100	98.89
	Positive extreme	62.01	47.02	100	99.05

^aUniversal tolerance limit recommended by TG‐218 for IMRT QA is > 95% of points passing 3%, 2 mm, with a 10% dose threshold. ¹⁰