title: Diagnostic accuracy of MR colonography with fecal tagging.
abstract: BACKGROUND
  MR colonography (MRC) is a non-invasive method of examining the colon, but it is still only used in a few specialized centers on a daily basis. The purpose of this study was to evaluate the performance of MRC with improved fecal tagging vs. conventional colonoscopy (CC).
  
  
  METHODS
  Between March 2006 and February 2007, consecutive patients who received first-time referrals to CC were asked to participate in the study. Two days prior to MRC, a new contrast mixture (barium/ferumoxsil) was ingested together with four meals each day. Standard bowel cleansing was performed before CC. MRC was evaluated by two blinded observers. MRC results were compared with CC.
  
  
  RESULTS
  A total of 56 patients were included. The per-polyp sensitivity was 85.7% for polyps 6-10 mm and 81.3% for polyps >10 mm. The per-patient sensitivity/specificity was 100%/80% for polyps >6 mm and 100%/91.4% for polyps >10 mm.
  
  
  CONCLUSIONS
  MRC showed acceptable per-patient sensitivities, but the per-polyp sensitivities are still compromised by the fecal tagging. MRC may be implemented, but at the present time MRC with fecal tagging is not ready for widespread use, although it remains a very promising diagnostic tool.
authors.affiliation: Department of Diagnostic Radiology, Copenhagen University Hospital Herlev, Herlev, Denmark. achiam1@dadl-net.dk
authors.forename: Michael Patrick
authors.initials: MP
authors.lastname: Achiam
authors.forename: Vibeke Berg
authors.initials: VB
authors.lastname: Løgager
authors.forename: Elizaveta
authors.initials: E
authors.lastname: Chabanova
authors.forename: Bodil
authors.initials: B
authors.lastname: Eegholm
authors.forename: Henrik Segelcke
authors.initials: HS
authors.lastname: Thomsen
authors.forename: Jacob
authors.initials: J
authors.lastname: Rosenberg
mesh_terms: D000328:Adult; D001466:Barium Sulfate; D003108:Colonic Diseases / Q000175:diagnosis*; D003113:Colonoscopy; D003287:Contrast Media; D005260:Female; D052203:Ferrosoferric Oxide; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D058185:Magnetite Nanoparticles; D008297:Male; D008536:Meglumine; D009942:Organometallic Compounds; D012680:Sensitivity and Specificity; D012833:Siloxanes
chemical_list: D003287:Contrast Media; D058185:Magnetite Nanoparticles; D009942:Organometallic Compounds; D012833:Siloxanes; D001466:Barium Sulfate; D008536:Meglumine; C088769:ferumoxsil; C072417:gadoterate meglumine; D052203:Ferrosoferric Oxide