Effect of abdominal compression on target movement and extension of the external boundary of peripheral lung tumours treated with stereotactic radiotherapy based on four-dimensional computed tomography

Table 2 Median and range of centroid shifts with and without compression in the LR, AP, and CC directions for group A, group B, and group C (mm)

Group	LR direction		AP direction		SI direction
Group	Com	Non-com	Com	Non-com	Com	Non-com
Group A
Median	0.80	0.75	1.45	1.55	2.40	3.40
Range	0.10–4.00	0.20–4.60	0.10–4.40	0.20–4.50	0.10–10.00	0.00–11.70
p	0.43		0.27		0.29
Group B
Median	1.20	0.70	1.20	1.30	1.50	2.50
Range	0.10–2.00	0.20–4.60	0.10–3.20	0.20–4.50	0.10–6.50	0.00–11.70
p	0.46		0.15		0.45
Group C
Median	1.00	1.00	1.90	1.80	2.90	6.40
Range	0.20–4.00	0.40–3.40	0.30–4.40	0.60–2.80	0.90–10.00	2.80–11.00
p	0.79		0.86		0.370.37

LR left–right, AP anterior–posterior, CC cranial–caudal, com compression, non-com non-compression, Group A all lesions group, Group B upper-middle-lobe lesions group, Group C lower-lobe lesions group

ISSN: 1748-717X