Comparison of treatment plans between IMRT with MR-linac and VMAT for lung SABR

Radiation Oncology

Table 2 Dose-volumetric parameters of the PTV

DV parameter	VMAT	IMRT with MR-linac	p
D_98% (Gy)	59.1 ± 0.3	60.3 ± 1.1	< 0.001
D_95% (Gy)	60.0 ± 0.0	60.7 ± 1.2	0.015
D_5% (Gy)	64.9 ± 1.3	63.8 ± 1.6	0.026
D_2% (Gy)	65.3 ± 1.4	64.2 ± 1.7	0.035
Minimum dose (Gy)	54.6 ± 1.4	58.7 ± 1.3	< 0.001
Maximum dose (Gy)	66.8 ± 1.3	63.8 ± 1.5	< 0.001
Mean dose (Gy)	63.0 ± 0.8	62.3 ± 1.4	0.047
PTV volume (cm³)	27.2 ± 23.5 (ITV + 5 mm)	6.3 ± 7.7 (GTV + 3 mm)	< 0.001
Homogeneity index	0.099 ± 0.023	0.062 ± 0.014	< 0.001

Note: DV parameter dose-volumetric parameter, VMAT volumetric modulated arc therapy, IMRT intensity modulated radiation therapy, MR-linac magnetic resonance image linear accelerator, D_n% dose received by at least n% volume of the planning target volume, PTV planning target volume, ITV internal target volume, GTV gross tumor volume

ISSN: 1748-717X