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The "CT Colonography" (CTC) image collection in DICOM format, PHI de-identified for public download  at https://imaging.nci.nih.gov/ncia/  contains 825 cases from the optical colonoscopy (OC) validated, ACRIN clinical trial whose subjects had same-day sequential CTC followed by OC. The attached documents separately lists OC verified cases that contain: Cases where no polyp was found; 69 cases possessing 6 to 9 mm polyps; and 35 cases that possess at least one polyp "larger than 10 mm." The key to the lesion coding in those XL files is: Polyp description key table.tiff CTC key to XL colon lesion spreadsheet.docx

Note: Notably, this collection, though as an 825 case subset of the ACRIN 2600+ total cases, nonetheless proportionally represents roughly the prevalence of polyps found in a general population.