title: Comparison of the diagnostic performance of CT colonography interpreted by radiologists and radiographers.
abstract: OBJECTIVE
  To compare computed tomographic colonography (CTC) performance of four trained radiographers with the CTC performance of two experienced radiologists.
  
  
  METHODS
  Four radiographers and two radiologists interpreted 87 cases with 40 polyps ≥6 mm. Sensitivity, specificity, and positive predictive value (PPV) were assessed on a per-patient basis. On a per-polyp basis, sensitivity was calculated according to the respective size categories (polyps ≥6 mm as well as polyps ≥10 mm).
  
  
  RESULTS
  Overall per-patient sensitivity for polyps ≥6 mm was 76.2 % (95 % CI 61.4-91.0) and 76.2 % (95 % CI 61.7-90.6), for the radiographers and radiologists, respectively. Overall per-patient specificity for polyps ≥6 mm were 81.4 % (95 % CI 73.7-89.2) and 81.1 % (95 % CI 73.8-88.3) for the radiographers and the radiologists, respectively. For the radiographers, overall per-polyp sensitivity was 60.3 % (95 % CI 50.3-70.3) and 60.7 % (95 % CI 42.2-79.2) for polyps ≥6 mm and ≥10 mm, respectively. For the radiologists, overall per polyp sensitivity was 59.2 % (95 % CI 46.4-72.0) and 69.0 % (95 % CI 48.1-89.6) for polyps ≥6 mm and ≥10 mm, respectively.
  
  
  CONCLUSIONS
  Radiographers with training in CT colonographic evaluation achieved sensitivity and specificity in polyp detection comparable with that of experienced radiologists.
  
  
  CONCLUSIONS
  • The diagnostic accuracy of trained radiographers was comparable to that of experienced radiologists. • The use of radiographers in reading CTC examinations is acceptable, however radiologists would still be necessary for the evaluation of extracolonic findings. • Skilled non-radiologists may play a vital role as a second reader of intraluminal findings or by performing quality control of examinations before patient dismissal.
authors.affiliation: Bachelor`s Degree Programme in Radiography Department of Technology Faculty of Health and Technology, Metropolitan University College, Sigurdsgade 26, 2200, Copenhagen N., Denmark, Cala@phmetropol.dk.
authors.forename: Carsten
authors.initials: C
authors.lastname: Lauridsen
authors.forename: Philippe
authors.initials: P
authors.lastname: Lefere
authors.forename: Oke
authors.initials: O
authors.lastname: Gerke
authors.forename: Steven
authors.initials: S
authors.lastname: Hageman
authors.forename: Jens
authors.initials: J
authors.lastname: Karstoft
authors.forename: Stefaan
authors.initials: S
authors.lastname: Gryspeerdt