I-Scan Versus High-definition White Light

The purpose of the study is to assess whether the use of I-scan during colonoscopy leads to an increased yield of adenomas in the colon among a population at increased risk for CRC. Primary Outcome: To estimate the mean number of adenomas per colonoscopy for both high definition white light colonoscopy and I-scan enhanced colonoscopy Secondary Outcomes: 1. To estimate the recruitment rate 2. Number of adenomas detected in the right colon during the second look