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The present "CT Colonography" (CTC) image collection, publicly downloadable in DICOM format at https://imaging.nci.nih.gov/ncia/  contains 827 cases from the well conducted, optical colonoscopy (OC) validated, ACRIN clinical trial whose subjects underwent same-day sequential CTC followed by OC. The attached documents in this Wiki offer separate lists of those OC verified cases that contain: 243 'NCIA CTC no polyp found'.xls; 69 cases possessing 6 to 9 mm polyps; and 35 cases that possess at least one polyp "larger than 10 mm."

Notably, this collection, though  a subset of the ACRIN 2600+ total cases, nonetheless proportionally represents the incidence and prevalence of polyp found in the general population.

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