Chromatic confocal microscopy for multi-depth imaging of epithelial tissue

Area of Science:

• Biomedical Optics
• Microscopy
• Tissue Imaging

Background:

• Non-transparent biological tissues pose challenges for microstructural imaging.
• Traditional microscopy methods often require mechanical scanning, limiting endoscopic applications and introducing motion artifacts.

Purpose of the Study:

• To develop a novel chromatic confocal microscope for volumetric reflectance imaging of microstructures in non-transparent biological tissues.
• To overcome limitations of traditional scanning techniques in endoscopic and in vivo imaging.

Main Methods:

• Utilized chromatic aberration of aspheric lenses to longitudinally disperse supercontinuum light.
• Employed a spectrometer to detect wavelength-encoded backscattered light, generating line images from spectral data.
• Achieved axial scanning through wavelength dispersion, eliminating the need for mechanical components.

Main Results:

• Demonstrated volumetric reflectance imaging of microstructure in non-transparent tissue.
• Achieved an imaging depth greater than 150 µm with an axial resolution of approximately 3 µm using a 590-775 nm wavelength range.
• Successfully captured volumetric images of buccal mucosa, resolving cellular morphology.

Conclusions:

• This novel chromatic confocal microscopy system provides deep imaging with high resolution in non-transparent biological tissues.
• The system represents a significant advancement for in vivo endomicroscopic imaging of epithelial tissues.
• Miniaturization holds promise for enhanced speed and accuracy in future endoscopic applications.