Analysis of inter- and intra fractional partial bladder wall movement using implanted fiducial markers

Radiation Oncology

Table 4 Intrafractional uncertainty of position (mm) and p-values of the comparison tests

Tumor location group		CC direction			LR direction			AP direction
Tumor location group		M	Σ	σ	M	Σ	σ	M	Σ	σ
CC group	Cranial	0.8	2.2	1.9	0.0	0.6	1.1	-0.4	0.7	2.0
	Caudal	0.0	0.3	1.4	-0.1	0.5	1.6	0.1	0.5	1.4
	p-value	0.20	0.01	0.44	0.48	0.91	0.47	0.06	0.53	0.24
LR group	Left	0.0	0.4	1.6	0.0	0.2	1.3	-0.1	0.5	1.1
	Right	0.7	2.0	1.7	-0.2	0.7	1.5	-0.2	0.7	2.1
	p-value	0.22	0.03	0.95	0.32	0.01	0.33	0.57	0.82	0.25
AP group	Anterior	1.0	1.0	1.9	0.0	0.6	1.3	-0.2	0.2	1.9
	Posterior	0.0	0.4	1.5	-0.1	0.5	1.5	-0.1	0.8	1.5
	p-value	0.19	<0.01	0.79	0.76	0.76	0.54	0.76	0.09	0.98
Overall		0.4	1.5	1.6	-0.1	0.5	1.4	-0.1	0.6	1.7

Abbreviations M mean overall uncertainty of position, Σ systematic uncertainty of position, σ random uncertainty of position, CC cranial-caudal, LR left-right, AP anterior-posterior
Bold: significant difference between two groups (p < 0.05 / 3)

ISSN: 1748-717X