Analyses of the factors influencing the accuracy of three-dimensional ultrasound in comparison with cone-beam CT in image-guided radiotherapy for prostate cancer with or without pelvic lymph node irradiation

Table 1 Comparison between CBCT and 3DUS shifts for group A and group B

	Group A (with pelvic lymph node irradiation)			Group B (without pelvic lymph node irradiation)
	SI	LR	AP	SI	LR	AP
Mean ± SD	−1.03 ± 5.40	−0.60 ± 3.62	− 0.82 ± 4.41	0.29 ± 5.11	0.19 ± 3.33	− 0.20 ± 4.22
P value	< 0.001	< 0.001	< 0.001	0.143	0.153	0.227
Shift agreement (%)	64.4	84.9	75.9	70.1	89.2	79.1
LOA (mm)	(−11.61, 9.55)	(−7.70, 6.50)	(−9.46, 7.82)	(− 9.73, 10.31)	(− 6.34, 6.72)	(− 8.47, 8.07)

CBCT Cone-beam computed tomography, 3DUS Three-dimensional ultrasound, SI Superior-inferior, LR Left-right, AP Anterior-posterior, SD Standard deviation, LOA Limits of agreement

ISSN: 1748-717X