< Back to topics
> Cover Page, Authors, Institutions
> View tables/images/videos
The verification system EPID-Rodeo 1.1 shows an accuracy within 0.2mm.
Analysis performed on the difference in the paired 80 EPID and film radiation
field center - ball shadow center distances shows a mean difference of 0.01mm
with 95% confidence interval (C.I.) of -0.03mm to 0.04mm. According
Bland-Altman analysis, limits of agreement EPID-film methods of -0.3 (95% C.I.
-0.4, -0.3) mm y 0.3 (95% C.I. 0.3, 0.4) mm were registered.
Inter-observer differences up to 0.3mm were found when we compared the results
of several film test registered by three operators. A perfect repeatability was
registered with the EPID based method against a figure of 0.2mm found for the
technique with film.