Does image-enhanced endoscopy help find more adenomas during a colonoscopy?
Image-enhanced endoscopy (IEE) is a group of techniques that change how the inside of the colon looks on screen during a colonoscopy. Some methods add color or digital filters, like narrow band imaging (NBI), linked color imaging (LCI), or texture and color enhancement imaging (TXI). The goal is to make flat or subtle adenomas (precancerous growths) easier to see. The short answer: several IEE methods do help doctors find more adenomas than standard high-definition white light imaging, but not every method works, and the size of the benefit depends on which one is used 35.
What the research says
A large network meta-analysis of 54 randomized trials with 28,663 participants compared several IEE methods against high-definition white light imaging (HD-WLI). For adenoma detection rate (ADR, the share of patients with at least one adenoma found), TXI ranked highest, with a risk ratio of 1.48 (95% CI 1.09-2.02), followed by LCI 3. For advanced adenomas, both TXI (RR 1.42) and LCI (RR 1.23) beat HD-WLI 3. New-generation NBI ranked highest for the number of adenomas found per patient 3.
What to ask your doctor
- An older meta-analysis of 42 trials found a mixed picture. Chromoendoscopy (CE, which uses dye sprays) clearly raised adenoma detection (RR 1.36, 95% CI 1.23-1.51), but NBI (RR 1.03), autofluorescence imaging (RR 1.04), FICE/i-scan (RR 1.09), and cap-assisted colonoscopy (RR 1.03) did not show a clear benefit over standard white light 5. A separate review noted that NBI performs similarly to chromoendoscopy for adenoma detection but is useful for telling polyp types apart 7.
This question is drawn from common patient questions about Gastroenterology and answered using cited medical research. We do not provide individualized advice.