Table 2.

MC‐to‐PB ratios of PTV V100 for virtual phantom cases with spherical GTVs of 15 mm, 30 mm, and 50 mm diameters, planned individually with 90%, 80%, 70%, and 60% prescription isodose lines and with 6 MV photon beams, as based on PB calculation

V100(MC)/V100(PB)	$Rx\hspace{0.17em}Line=90\%$	$Rx\hspace{0.17em}Line=80\%$	$Rx\hspace{0.17em}Line=70\%$	$Rx\hspace{0.17em}Line=60\%$
${\mathrm{D}}_{\text{GTV}}=15\hspace{0.17em}\text{mm}$	0.01	0.09	0.17	0.27
${\mathrm{D}}_{\text{GTV}}=30\hspace{0.17em}\text{mm}$	0.23	0.31	0.47	0.57
${\mathrm{D}}_{\text{GTV}}=50\hspace{0.17em}\text{mm}$	0.48	0.54	0.70	0.78