Polyp measurement based on CT colonography and colonoscopy: variability and systematic differences.

Abstract:

OBJECTIVE:To assess the variability and systematic differences in polyp measurements on optical colonoscopy and CT colonography. MATERIALS:Gastroenterologists measured 51 polyps by visual estimation, forceps comparison and linear probe. CT colonography observers randomly assessed polyp size two-dimensionally (abdominal and intermediate window) and three-dimensionally (manually and semi-automatically). Linear mixed models were used to assess the variability and systematic differences between CT colonography and optical colonoscopy techniques. RESULTS:The variability of forceps and linear probe measurements was comparable and both showed less variability than measurement by visual assessment. Measurements by linear probe were 0.7 mm smaller than measurements by visual assessment or by forceps. The variability of all CT colonography techniques was lower than for measurements by forceps or visual assessment and sometimes lower (only 2D intermediate window and manual 3D) compared with measurements by linear probe. All CT colonography measurements judged polyps to be larger than optical colonoscopy, with differences ranging from 0.7 to 2.3 mm. CONCLUSION:A linear probe does not reduce the measurement variability of endoscopists compared with the forceps. Measurement differences between observers on CT colonography were usually smaller than at optical colonoscopy. Polyps appeared larger when using various CT colonography techniques than when measured during optical colonoscopy.

journal_name

Eur Radiol

journal_title

European radiology

authors

de Vries AH,Bipat S,Dekker E,Liedenbaum MH,Florie J,Fockens P,van der Kraan R,Mathus-Vliegen EM,Reitsma JB,Truyen R,Vos FM,Zwinderman AH,Stoker J

doi

10.1007/s00330-009-1683-0

subject

Has Abstract

pub_date

2010-06-01 00:00:00

pages

1404-13

issue

6

eissn

0938-7994

issn

1432-1084

journal_volume

20

pub_type

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