Polyp measurement and size categorisation by CT colonography: effect of observer experience in a multi-centre setting.

European Radiology
D BurlingJane Williams-Butt

Abstract

The extent measurement error on CT colonography influences polyp categorisation according to established management guidelines is studied using twenty-eight observers of varying experience to classify polyps seen at CT colonography as either 'medium' (maximal diameter 6-9 mm) or 'large' (maximal diameter 10 mm or larger). Comparison was then made with the reference diameter obtained in each patient via colonoscopy. The Bland-Altman method was used to assess agreement between observer measurements and colonoscopy, and differences in measurement and categorisation was assessed using Kruskal-Wallis and Chi-squared test statistics respectively. Observer measurements on average underestimated the diameter of polyps when compared to the reference value, by approximately 2-3 mm, irrespective of observer experience. Ninety-five percent limits of agreement were relatively wide for all observer groups, and had sufficient span to encompass different size categories for polyps. There were 167 polyp observations and 135 (81%) were correctly categorised. Of the 32 observations that were miscategorised, 5 (16%) were overestimations and 27 (84%) were underestimations (i.e. large polyps misclassified as medium). Caution should be exercised for ...Continue Reading

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Aug 11, 2007·Abdominal Imaging·Didier Bielen, Gabriel Kiss
Sep 18, 2012·European Radiology·Emanuele NeriUNKNOWN ESGAR CT Colonography Working Group
Jul 27, 2010·Gastrointestinal Endoscopy Clinics of North America·Noriko SuzukiStuart A Taylor
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Jul 31, 2008·Journal of Computer Assisted Tomography·Didier BielenGuy Marchal
Jan 30, 2019·Canadian Association of Radiologists Journal = Journal L'Association Canadienne Des Radiologistes·Gurjeet DulkuRichard Mendelson

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