Table 1. Comparisons of global gamma pass rates and beam delivery times between non-gated and gated 6 MV FFF noncoplanar VMAT and IMRT deliveries using the identical patient’s CT images and dose prescriptions/constraints, where the global gamma pass rates were calculated with a threshold of 10% and a criterion of 3 mm/3% in absolute dose mode.

The total MUs were also indicated.

FFF: flattening filter-free; VMAT: volumetric modulated arc therapy; IMRT: intensity-modulated radiotherapy; CT: computed tomography; MU: monitor unit

	6 MV FFF VMAT (noncoplanar 3 arcs)		6 MV FFF sliding-window IMRT (noncoplanar 7 ports)
	Non-gated	Gated	Non-gated	Gated
Global gamma pass rate (%)	94.4	94.3	99.2	99.2
Beam delivery time (sec)	133	373	140	375
Total MU	2377		2270