Mesorectal motion evaluation in rectal cancer MR-guided radiotherapy: an exploratory study to quantify treatment margins

Table 3 PCC results for the correlation analysis between the volumetric change in the superior, middle and lower mesorectum and the volumetric changes in the bladder, rectum and bowel

	Msup			Mmid			Mlow
Pt	Bowel	Rectum	Bladder	Bowel	Rectum	Bladder	Bowel	Rectum	Bladder
1	0.30	0.27	0.53	0.19	− 0.40	− 0.01	0.14	0.16	0.42
2	0.02	− 0.14	− 0.10	− 0.09	− 0.43	0.45	0.10	− 0.32	0.36
3	0.11	0.52	0.37	0.37	− 0.19	0.78	0.00	− 0.53	0.39
4	− 0.23	0.79	0.46	0.11	− 0.14	0.81	− 0.06	− 0.25	0.18
5	− 0.17	0.52	0.28	0.07	0.00	0.76	− 0.05	− 0.05	0.45
6	0.42	0.38	0.57	− 0.27	0.09	0.41	− 0.31	− 0.22	0.06
7	0.00	0.14	0.03	− 0.03	0.07	0.33	− 0.11	− 0.39	0.33
8	− 0.24	0.55	0.33	0.13	0.09	0.28	0.02	− 0.29	− 0.30
9	− 0.01	0.31	0.00	− 0.07	0.13	− 0.17	0.05	− 0.25	0.19
10	0.27	− 0.15	0.09	0.07	− 0.77	0.20	0.31	− 0.49	0.32
11	0.62	0.77	0.71	0.45	0.51	0.73	− 0.38	− 0.38	− 0.15
12	− 0.64	0.32	0.45	− 0.51	0.30	0.00	0.17	0.48	− 0.14
Significant correlation frequency	0	2	1	0	1	4	0	0	0

Significant values are shown in bold
Pt, patient; Msup, superior mesorectum; Mmid, middle mesorectum; Mlow, lower mesorectum. The last row of Table 3 reports the number of cases where a significant correlation was observed: the only significant correlation was observed between bladder and medium mesorectum volume (4/12 patients)

ISSN: 1748-717X