Optical Imaging Technologies and Clinical Applications in Gastrointestinal Endoscopy

Area of Science:

• Gastroenterology and Endoscopy
• Medical Imaging
• Oncology

Background:

• White-light endoscopy (WLE) has limitations in visualizing subtle mucosal and vascular features.
• Optical imaging technologies offer enhanced visualization of gastrointestinal (GI) structures.
• The clinical utility and validation status of various optical imaging techniques differ across GI indications.

Purpose of the Study:

• To critically review guideline-endorsed and investigational optical imaging techniques in gastroenterology.
• To evaluate diagnostic performance, validation levels, and practical challenges of these technologies.
• To discuss future directions for optical imaging in GI endoscopy.

Main Methods:

• Systematic review of optical imaging modalities in major GI indications.
• Analysis of diagnostic performance, guideline recommendations, and adoption challenges.
• Inclusion of techniques like narrow-band imaging (NBI), chromoendoscopy, capsule endoscopy, and advanced investigational modalities.

Main Results:

• Narrow-band imaging (NBI) and acetic acid chromoendoscopy are endorsed for Barrett's esophagus and gastric lesions.
• Dye-spray chromoendoscopy is standard for IBD dysplasia surveillance; virtual methods are alternatives.
• NBI aids colorectal optical diagnosis; dye-based chromoendoscopy improves detection of flat/serrated lesions.
• Capsule endoscopy is standard for small bowel evaluation; AI adjuncts are emerging.
• Advanced techniques like confocal laser endomicroscopy show potential but are largely investigational.

Conclusions:

• Guideline-backed optical imaging (NBI, chromoendoscopy) is established in clinical practice.
• Advanced optical imaging techniques require broader validation for routine use.
• Future advancements will involve AI integration, molecular probes, and next-generation capsule technologies for improved GI endoscopy.