An adaptive-coherence light source for hyperspectral, topographic, and flow-contrast imaging

Area of Science:

• Biomedical Optics
• Gastroenterology
• Medical Imaging

Background:

• Colorectal cancer (CRC) is a significant cause of cancer death in the US.
• Subtle neoplastic lesions, like non-polypoid growths, are often missed in standard colonoscopies due to poor contrast.
• Current white light endoscopy struggles to detect these early-stage, low-contrast lesions.

Purpose of the Study:

• To develop an advanced endoscopic light source for improved colorectal lesion detection.
• To enhance visualization of subtle neoplastic growths during colonoscopy.
• To overcome the limitations of current white light endoscopy in detecting low-contrast lesions.

Main Methods:

• A novel endoscopic light source was designed with custom red-green-blue laser channels and laser speckle reducers.
• Multimodal imaging techniques including color, topographic, and speckle contrast flow imaging were employed.
• Photometric stereo endoscopy algorithms and laser speckle contrast imaging were utilized for topography reconstruction and flow enhancement.

Main Results:

• The system successfully reconstructed tissue phantom topography using alternating laser illumination.
• Optical flow phantoms demonstrated enhanced contrast in flow regions via laser speckle contrast imaging.
• The developed light source offers improved power efficiency, reduced size, and longer lifespan compared to traditional arc lamps.

Conclusions:

• The novel endoscopic light source shows significant promise for improving the detection rates of subtle colorectal lesions.
• Enhanced multimodal imaging capabilities can overcome current limitations in colonoscopic lesion visualization.
• This technology could lead to earlier diagnosis and improved patient outcomes in colorectal cancer screening.