A group of advanced endoscopic imaging techniques that improve visualization of the gastrointestinal (GI) mucosa beyond what standard white-light endoscopy shows.

Helps detect subtle lesions, precancerous changes, early cancers, and guides targeted biopsies or therapy.

Types of IEE

Narrow Band Imaging (NBI)

Uses filtered blue & green light (short wavelengths) → enhances capillaries and mucosal patterns.

Useful for: esophagus (Barrett’s, early cancer), stomach, colon polyps.

Flexible Spectral Imaging Color Enhancement (FICE) / i-Scan

Digital post-processing to enhance mucosal surface and vascular details.

Helpful in IBD surveillance, polyp detection.

Chromoendoscopy

Dye-based enhancement (e.g., indigo carmine, methylene blue, Lugol’s iodine).

Useful for colorectal cancer screening in IBD, Barrett’s esophagus.

Autofluorescence Imaging (AFI)

Uses natural tissue fluorescence → differentiates normal from abnormal mucosa.

Investigational, less commonly used now.

Confocal Laser Endomicroscopy (CLE)

Provides “virtual histology” (microscope-level imaging during endoscopy).

Helps in Barrett’s esophagus, gastric cancer, IBD dysplasia.

Clinical Uses of IEE

Early cancer detection: esophagus, stomach, colon.

Barrett’s esophagus surveillance.

Colon polyp detection and characterization.

Inflammatory bowel disease surveillance (detect dysplasia).

Celiac disease & villous atrophy detection.

Guiding targeted biopsies (reduces random biopsies).

Advantages

Noninvasive, real-time, higher diagnostic accuracy.

Improves detection of flat or subtle lesions missed by standard endoscopy.

Helps avoid unnecessary biopsies by characterizing lesions in vivo.