Radiation Oncology

Table 2 PTV dose differences in liver SBRT between the CT datasets

From: Dosimetric impact of different CT datasets for stereotactic treatment planning using 3D conformal radiotherapy or volumetric modulated arc therapy

		3D-CRT		VMAT
	CT datasets	Δ [%]	P value	Δ [%]	P value
ΔD_mean	PCT vs AIP	−0.5 ± 0.7	0.04^*	−0.4 ± 0.5	0.03^*
	MIP vs AIP	−1.1 ± 0.7	0.01^*	−0.9 ± 0.7	0.01^*
	MidV vs AIP	0.0 ± 0.3	0.39	0.1 ± 0.4	0.24
	MIP vs PCT	−0.7 ± 0.9	0.06	−0.5 ± 0.7	0.07
	MidV vs PCT	0.4 ± 0.8	0.06	0.5 ± 0.6	0.05
	MIP vs MidV	−1.1 ± 0.7	0.01^*	−0.9 ± 0.5	0.01^*
ΔD₂	PCT vs AIP	−0.3 ± 0.4	0.05	−0.3 ± 0.5	0.06
	MIP vs AIP	−1.2 ± 0.7	0.01^*	−1.1 ± 0.6	0.01^*
	MidV vs AIP	−0.2 ± 0.4	0.14	−0.1 ± 0.4	0.67
	MIP vs PCT	−0.8 ± 0.8	0.01^*	−0.7 ± 0.7	0.01^*
	MidV vs PCT	0.1 ± 0.7	0.48	0.2 ± 0.7	0.33
	MIP vs MidV	−0.9 ± 0.6	0.01^*	−0.9 ± 0.5	0.01^*
ΔD₉₈	PCT vs AIP	−0.8 ± 0.9	0.02^*	−0.5 ± 0.4	0.01^*
	MIP vs AIP	−0.6 ± 1.3	0.06	−0.8 ± 0.6	0.01^*
	MidV vs AIP	0.4 ± 0.5	0.03^*	0.1 ± 0.3	0.15
	MIP vs PCT	0.2 ± 0.9	0.92	−0.4 ± 0.7	0.10
	MidV vs PCT	1.2 ± 1.0	0.01^*	0.6 ± 0.5	0.02^*
	MIP vs MidV	−1.0 ± 1.2	0.01^*	−0.9 ± 0.6	0.01^*
ΔD₉₅	PCT vs AIP	−0.7 ± 0.8	0.02^*	−0.5 ± 0.4	0.02^*
	MIP vs AIP	−1.2 ± 1.7	0.07	−0.8 ± 0.6	0.01^*
	MidV vs AIP	0.4 ± 0.6	0.04^*	0.1 ± 0.3	0.08
	MIP vs PCT	−0.5 ± 1.9	0.72	−0.4 ± 0.7	0.14
	MidV vs PCT	1.1 ± 0.9	0.01^*	0.6 ± 0.6	0.02^*
	MIP vs MidV	−1.6 ± 1.3	0.01^*	−0.9 ± 0.5	0.01^*

Relative differences over all patients (mean ± standard deviation) of dosimetric values for PTV in liver SBRT between the different CT datasets for 3D-CRT and VMAT plans. PCT planning CT, AIP average intensity projection CT, MIP maximum intensity projection CT, MidV mid-ventilation CT. *assigns statistical significant values (p < 0.05)

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