. 2019 Jun 17;20(7):109–120. doi: 10.1002/acm2.12663

Table 4.

Variations in ITVs for AIP and MIP CT datasets in the irregular motion patterns for gated and nongated plans.

Phase range	Respiratory motion pattern	Image type	ITV (cm³)	ITV variation (AIP/MIP)
Gated 30%–70%	Slightly irregular	AIP	8.36	−7.73%
	Slightly irregular	MIP	9.06	−7.73%
	Amplitude irregular	AIP	7.28	−7.61%
	Amplitude irregular	MIP	7.88	−7.61%
	Period irregular	AIP	10.12	−6.73%
	Period irregular	MIP	10.85	−6.73%
	Period and amplitude irregular	AIP	7.33	−6.15%
	Period and amplitude irregular	MIP	7.81	−6.15%
Nongated 10%–90%	Slightly irregular	AIP	10.12	−12.31%
	Slightly irregular	MIP	11.54	−12.31%
	Amplitude irregular	AIP	9.18	−12.99%
	Amplitude irregular	MIP	10.55	−12.99%
	Period irregular	AIP	10.2	−14.00%
	Period irregular	MIP	11.86	−14.00%
	Period and amplitude irregular	AIP	8.19	−15.22%
	Period and amplitude irregular	MIP	9.66	−15.22%

AIP, average intensity projection; ITV, internal target volumes; MIP, maximum intensity projection.