Current Colorectal Cancer Reports

, Volume 7, Issue 1, pp 71-79

First online:

Decreased-Purgation CT Colonography: State of the Art

  • Shmuel Y. MahgereftehAffiliated withDepartment of Radiology, Hadassah-Hebrew University Medical Center
  • , Arye BlacharAffiliated withDepartment of Radiology, Tel Aviv, Sourasky Medical Center
  • , Shifra FraifeldAffiliated withDepartment of Radiology, Hadassah-Hebrew University Medical Center
  • , Jacob SosnaAffiliated withDepartment of Radiology, Hadassah-Hebrew University Medical CenterDepartment of Radiology, Beth Israel Deaconess Medical Center Email author 

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In the setting of CT colonography (CTC), decreasing bowel preparation measures may help to optimize colorectal cancer screening compliance without compromising accuracy. Decreased-purgation or wholly noncathartic CTC, known as nonconventional CTC, may be accomplished in conjunction with fecal tagging. Image post-processing technologies such as electronic cleansing and computer-aided detection may boost accuracy and decrease the need for bowel preparation even further. We review pre-study preparation and image post-processing techniques that have been described in nonconventional-preparation CTC studies over the past 10 years. We explore in detail specific aspects of nonconventional cathartic and fecal tagging regimens, including substance, dose, and time frame of ingestion.


CT colonography Virtual colonoscopy Fecal tagging Bowel preparation Catharsis Purgation Electronic cleansing Spectral cleansing Computer-aided detection Virtual tagging Colorectal cancer screening