Table 1.

A summary of major simulation parameters.

	Parameter	Value	Parameter	Value
EGRT	PET detector extent	2 cm	Leaf aperture at iso(x-y)	0.5 cm
	PET detector coverage	180° arc	Leaf aperture at iso (z)	1 cm
	PET ring radius	50 cm	EGRT spatial window	±0.5° arc
	Linac rotating frequency	1 Hz	EGRT time window	500 ms
	Linac radius	60 cm	Helical pitch (conventional)	0.2
	Background activity	3 kBq/cc
	Collimator radius	50 cm	Radiotracer	FDG
	Collimator leaves	64	Firing positions	256
GATE	Version	V5.0.0.p01	Light decay time (LSO)	40 ns
	Coincidence window	10 ns	Energy resolution	0.26
	Scatter threshold (keV)	350, 650	Multiple coincidence policy	takeWinnerofGoods
XCAT-lung	Respiration period	4.2 s	Phantom size	256 × 256 × 35
	Respiration phases	12	Voxel resolution	2 mm
	GTV size	9.40 cm3	Sinogram bin size	256 × 64 × 35
	ITV size	17.01 cm3	Tracer uptake ratio	8:0.5:1
	PTV size	153.90 cm3
XCAT-prostate	PTV margin	6 mm	Phantom size	256 × 256 × 39
	Setup error	6 mm	Voxel resolution	2 mm
	GTV/ITV size	33. 27 cm3	Sinogram bin size	256 × 64 × 39
	PTV size	71.73 cm3	Tracer uptake ratio	8.5:1