Table 3.

OARs geometric center difference between AIP and FB and MidV CT imaging

OARs	Conditions		3D vector difference (mm)			P
			Average	Min.	Max.
Lungs‐ITV	Small PTV	AIP vs FB	−0.04	−0.61	0.18	0.799
		AIP vs MIP	0.03	−0.07	0.18	0.445
	Large PTV	AIP vs FB	−0.05	−0.78	0.52	0.658
		AIP vs MIP	0.06	−0.34	0.57	0.084
Trachea	Small PTV	AIP vs FB	0.02	−0.15	0.22	0.721
		AIP vs MIP	−0.01	−0.13	0.20	0.799
	Large PTV	AIP vs FB	0.02	−0.22	0.28	0.601
		AIP vs MIP	−0.03	−0.22	0.17	0.133
Heart	Small PTV	AIP vs FB	0.02	−0.19	0.25	0.799
		AIP vs MIP	0.01	−0.17	0.18	0.799
	Large PTV	AIP vs FB	−0.06	−0.27	0.23	0.078
		AIP vs MIP	−0.02	−0.40	0.31	0.546
Esophagus	Small PTV	AIP vs FB	0.00	−0.71	0.34	0.441
		AIP vs MIP	0.01	−0.28	0.21	0.735
	Large PTV	AIP vs FB	−0.09	−0.54	0.39	0.171
		AIP vs MIP	−0.02	−0.44	0.37	0.520
Spinal cord	Small PTV	AIP vs FB	−0.01	−0.21	0.13	0.799
		AIP vs MIP	0.02	−0.05	0.10	0.575
	Large PTV	AIP vs FB	−0.06	−0.49	0.17	0.227
		AIP vs MIP	−0.01	−0.28	0.24	0.809

OARs, organs at risk; AIP, average intensity projection; FB, free breathing; MidV, mid‐ventilation.