Ultra-miniature dual-wavelength spatial frequency domain imaging for micro-endoscopy.

Area of Science:

• Biomedical optics
• Medical imaging
• Cancer diagnostics

Background:

• Early detection of gastrointestinal cancers requires cost-effective, quantitative endoscopic imaging.
• Conventional spatial frequency domain imaging (SFDI) systems are often bulky and not suitable for endoscopic use.

Purpose of the Study:

• To develop an ultra-miniature SFDI system for endoscopic application.
• To create a compact imaging tool capable of quantitative optical property mapping for cancer detection.

Main Methods:

• Fabrication of a prototype SFDI system with an outer diameter of 3 mm, utilizing an optical fiber array and a micro camera.
• Development of a phase-tracking algorithm for rapid SFDI demodulation using fringe projections.
• Validation using tissue-mimicking phantoms and a support vector machine classifier.

Main Results:

• The ultra-miniature SFDI system demonstrated comparable quantitative optical property recovery to a conventional bench-top system (15% absorption, 6% reduced scattering agreement).
• Simultaneous imaging at 515 and 660 nm provided enhanced contrast between simulated healthy and tumor tissues.
• Sensitivity and specificity exceeding 90% were estimated for simulated squamous cell carcinoma detection.

Conclusions:

• The developed ultra-miniature SFDI device is a promising, cost-effective tool for quantitative imaging in endoscopy.
• It can detect variations in optical absorption and scattering indicative of early-stage cancer.
• This technology has the potential to improve early cancer diagnosis and patient outcomes.