Table 1.

Measured parameters for phantom data

	Distance		ITV (PET Edge)				ITV (40% threshold)
	Traj 1	Traj 2	μ1 ± σ1	μ2 ± σ2	μ3 ± σ3	μ4 ± σ4	μ1 ± σ1	μ2 ± σ2	μ3 ± σ3	μ4 ± σ4
T1	76.2%	31.3%	1.62 ± 0.51	0.83 ± 0.21	0.82 ± 0.16	0.86 ± 0.15	1.83 ± 1.05	0.70 ± 0.10	0.65 ± 0.07	0.66 ± 0.04
T2	80.2%	31.3%	1.64 ± 0.46	0.88 ± 0.18	0.83 ± 0.16	0.87 ± 0.17	2.33 ± 1.40	0.75 ± 0.22	0.67 ± 0.10	0.68 ± 0.08
A1	89.0%	94.0%	1.79 ± 0.25	1.09 ± 0.12	1.01 ± 0.07	1.03 ± 0.05	2.06 ± 1.13	0.84 ± 0.18	0.84 ± 0.10	0.83 ± 0.05
A2	86.4%	60.0%	1.39 ± 0.19	0.93 ± 0.15	0.90 ± 0.11	0.95 ± 0.10	1.68 ± 0.88	0.67 ± 0.06	0.74 ± 0.06	0.77 ± 0.03

Abbreviations: ITV = internal target volumes; PET = positron emission tomography; Traj = trajectory.

Motion displacement recovery and measured to expected ITV measurements across the 4 gating algorithms for the phantom data. PET Edge was used to segment end-exhale and end-inhale images for superior-inferior distance measurements. Images at several signal-to-background ratios were used to collect the data for sphere sizes 2 to 4 cm (trajectory 1: n = 24 per algorithm; traj 2: n = 21 for A2, n=18 for rest). ITV measurements (mean and SD) are shown for all spheres (n = 6 per sphere size per algorithm).