title: CT colonography polyp matching: differences between experienced readers.
abstract: The purpose of this study was to investigate if experienced readers differ when matching polyps shown by both CT colonography (CTC) and optical colonoscopy (OC) and to explore the reasons for discrepancy. Twenty-eight CTC cases with corresponding OC were presented to eight experienced CTC readers. Cases represented a broad spectrum of findings, not completely fulfilling typical matching criteria. In 21 cases there was a single polyp on CTC and OC; in seven there were multiple polyps. Agreement between readers for matching was analyzed. For the 21 single-polyp cases, the number of correct matches per reader varied from 13 to 19. Almost complete agreement between readers was observed in 15 cases (71%), but substantial discrepancy was found for the remaining six (29%) probably due to large perceived differences in polyp size between CT and OC. Readers were able to match between 27 (71%) and 35 (92%) of the 38 CTC detected polyps in the seven cases with multiple polyps. Experienced CTC readers agree to a considerable extent when matching polyps between CTC and subsequent OC, but non-negligible disagreement exists.
authors.affiliation: Department of Radiology, Academic Medical Center, Meibergdreef 9, 1105, AZ, Amsterdam, Netherlands. m.h.liedenbaum@amc.uva.nl
authors.forename: Marjolein H
authors.initials: MH
authors.lastname: Liedenbaum
authors.forename: Ayso H
authors.initials: AH
authors.lastname: de Vries
authors.forename: Steve
authors.initials: S
authors.lastname: Halligan
authors.forename: Patrick M M
authors.initials: PM
authors.lastname: Bossuyt
authors.forename: Abraham H
authors.initials: AH
authors.lastname: Dachman
authors.forename: Evelien
authors.initials: E
authors.lastname: Dekker
authors.forename: Jasper
authors.initials: J
authors.lastname: Florie
authors.forename: Stefaan S
authors.initials: SS
authors.lastname: Gryspeerdt
authors.forename: Sebastiaan
authors.initials: S
authors.lastname: Jensch
authors.forename: C Daniel
authors.initials: CD
authors.lastname: Johnson
authors.forename: Andrea
authors.initials: A
authors.lastname: Laghi
authors.forename: Stuart A
authors.initials: SA
authors.lastname: Taylor
authors.forename: Jaap
authors.initials: J
authors.lastname: Stoker
mesh_terms: D003111:Colonic Polyps / Q000473:pathology* / Q000532:radiotherapy*; D023881:Colonography, Computed Tomographic / Q000379:methods*; D003113:Colonoscopy; D005060:Europe; D006801:Humans; D015588:Observer Variation; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014481:United States