Impact of Cold Weather on Setup Errors in Radiotherapy

Table 7

M_PTV of CTV to PTV expansion boundary of patients with pelvic disease in different groups.

Group	Number of CBCT				δ			MPTV
		X	Y	Z	X	Y	Z	X	Y	Z
Cold weather group	33	0.20	0.27	0.23	0.18	0.18	0.16	0.63	0.79	0.68
Usual weather group	115	0.18	0.18	0.16	0.20	0.26	0.20	0.61	0.79	0.61