Table 2.

Comparison of overall positioning errors in 20 breast cancer patients using OSMS and CBCT scan.

Patient number	(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
OSMS (cm)	0.22 ± 0.05	0.25 ± 0.03	0.26 ± 0.03	0.28 ± 0.03	0.25 ± 0.04	0.24 ± 0.01	0.25 ± 0.02	0.29 ± 0.02	0.03 ± 0.01	0.28 ± 0.04
CBCT (cm)	0.24 ± 0.07	0.16 ± 0.07	0.19 ± 0.03	0.23 ± 0.02	0.23 ± 0.02	0.25 ± 0.02	0.24 ± 0.05	0.25 ± 0.02	0.05 ± 0.02	0.27 ± 0.02
P value	0.65	0.13	0.15	0.17	0.18	0.18	0.94	0.15	0.58	0.67
Patient number	(11)	(12)	(13)	(14)	(15)	(16)	(17)	(18)	(19)	(20)
OSMS (cm)	0.26 ± 0.05	0.27 ± 0.02	0.26 ± 0.03	0.26 ± 0.05	0.24 ± 0.02	0.26 ± 0.03	0.25 ± 0.03	0.28 ± 0.02	0.25 ± 0.03	0.26 ± 0.02
CBCT (cm)	0.26 ± 0.01	0.24 ± 0.06	0.23 ± 0.04	0.25 ± 0.04	0.26 ± 0.02	0.21 ± 0.04	0.26 ± 0.05	0.24 ± 0.01	0.27 ± 0.03	0.24 ± 0.04
P value	1.00	0.38	0.50	0.83	0.65	0.09	0.88	0.11	0.61	0.55

OSMS: Optical Surface Management System; CBCT: cone-beam computed tomography. The P value was obtained using paired t-tests.