European Radiology

, Volume 23, Issue 3, pp 720-729

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

The second ESGAR consensus statement on CT colonography

  • Emanuele NeriAffiliated withDiagnostic and Interventional Radiology, University of Pisa Email author 
  • , Steve HalliganAffiliated withUniversity College London, Centre for Medical Imaging, University College Hospital
  • , Mikael HellströmAffiliated withDepartment of Radiology, Sahlgrenska University Hospital and Sahlgrenska Academy at University of Gothenburg
  • , Philippe LefereAffiliated withVirtual Colonoscopy Teaching Centre
  • , Thomas MangAffiliated withDepartment of Radiology, Medical University of Vienna
  • , Daniele ReggeAffiliated withInstitute for Cancer Research and Treatment
  • , Jaap StokerAffiliated withDepartment of Radiology, Academic Medical Center, University of Amsterdam
  • , Stuart TaylorAffiliated withDepartment of Medical Imaging, University College London
  • , Andrea LaghiAffiliated withDepartment of Radiological Sciences, Oncology and Pathology, Sapienza - Università di Roma
    • , ESGAR CT Colonography Working GroupAffiliated withDepartment of Translational Research, and Advanced Technologies in Medicine and Surgery, University of Pisa



To update quality standards for CT colonography based on consensus among opinion leaders within the European Society of Gastrointestinal and Abdominal Radiology (ESGAR).

Material and methods

A multinational European panel of nine members of the ESGAR CT colonography Working Group (representing six EU countries) used a modified Delphi process to rate their level of agreement on a variety of statements pertaining to the acquisition, interpretation and implementation of CT colonography. Four Delphi rounds were conducted, each at 2 months interval.


The panel elaborated 86 statements.

In the final round the panelists achieved complete consensus in 71 of 86 statements (82 %). Categories including the highest proportion of statements with excellent Cronbach's internal reliability were colon distension, scan parameters, use of intravenous contrast agents, general guidelines on patient preparation, role of CAD and lesion measurement.

Lower internal reliability was achieved for the use of a rectal tube, spasmolytics, decubitus positioning and number of CT data acquisitions, faecal tagging, 2D vs. 3D reading, and reporting.


The recommendations of the consensus should be useful for both the radiologist who is starting a CTC service and for those who have already implemented the technique but whose practice may need updating.

Key Points

Computed tomographic colonography is the optimal radiological method of assessing the colon

This article reviews ESGAR quality standards for CT colonography

This article is aimed to provide CT-colonography guidelines for practising radiologists

The recommendations should help radiologists who are starting/updating their CTC services


CT colonography Guidelines Computed tomography Colon Polyps