C-RADS for CT Colonography


The Working Group on Virtual Colonoscopy published in 2005 a guide to the interpretation of Computed Tomography (CT) colonography results: the CT Colonography Reporting and Data System (C-RADS). It includes a Description of Terms for reporting the size, morphologic features, and location of polyps and masses, a Description of a Reporting Scheme for Colonic and Extracolonic Lesions with Management Recommendations.

Online Tool

BIOPROGNOS has already implemented ―for training or educational purposes―, the last versions of C-RADS for Colorectal Cancer screening and detection. Use is free of charge and not limited.


Colon Cancer Reporting and Data System (C-RADS) by American College of Radiology is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.


Request RADS Access


Final Report

Once entered the patient data, our C-RADS Score Calculator for CT Colonography presents the results as a PDF document, that can be downloaded or sent by email.

Click here to open it in PDF format.

The report includes all Patient Data as well as Score, calculated according last version of C-RADS.

The Science Behind C-RADS for CT Colonography

Based on Publications

  1. Yee, J., Chang, K. J., et al. (2016). The added value of the CT Colonography Reporting and Data System. American College of Radiology. DOI: 10.1016/j.jacr.2016.04.031
  2. Zalis, M. E., Barish, M. A., et al. (2005). CT Colonography Reporting and Data System: A consensus proposal. Radiology, 236: 3-9. DOI: 10.1148/radiol.2361041926

Related Publications

  1. Johnson, C. D., Chen, M. H., et al. (2008). Accuracy of CT colonography for detection of large adenomas and cancers. The New England Journal of Medicine, 359 (12): 1207-17 DOI: 10.1056/NEJMoa0800996.
  2. Pooler, B. D., Kim, D. H., et al. (2014). CT Colonography Reporting and Data System (C-RADS): Benchmark Values From a Clinical Screening Program. American Journal of Roentgenol, 202(6): 1232-1237. DOI: 10.2214/AJR.13.11272.