Optical anisotropy measurement in normal and cancerous tissues: backscattering technique

Area of Science:

• Biomedical Optics
• Cancer Diagnostics
• Tissue Engineering

Background:

• Assessing tissue architecture deformation is crucial for cancer diagnosis.
• Optical methods offer rapid, precise, real-time microscopic analysis of tissue alterations.
• The enhanced backscattering (EBS) technique enables in-vivo measurement of optical scattering characteristics.

Purpose of the Study:

• To evaluate optical anisotropy of human epithelial tissues using EBS.
• To distinguish between normal and cancerous tissues based on anisotropy.
• To assess orientation dependence of mean scattering length in various human organs.

Main Methods:

• Employed EBS technique for in-vivo optical anisotropy assessment.
• Utilized helicity preserving channel to eliminate polarization-induced anisotropy.
• Used rotating ground glass diffuser to remove background speckle noise.
• Analyzed backscattering cones with a high-resolution CCD camera.

Main Results:

• Observed modifications in the strength and degree of optical anisotropy during cancer progression.
• Found that fibrous tissues show decreased anisotropy, while cuboidal tissues show increased anisotropy upon cancerous transformation.
• Correlated experimental findings with morphological alterations of epithelial cells.

Conclusions:

• EBS technique effectively evaluates optical anisotropy for cancer diagnosis.
• Tissue anisotropy changes are indicative of cancer progression and correlate with cell morphology.
• EBS is a potent, non-destructive, and accessible tool for real-time tissue diagnosis.