Subdiffusion reflectance spectroscopy to measure tissue ultrastructure and microvasculature: model and inverse...

Area of Science:

• Biomedical Optics
• Biophysics
• Tissue Optics

Background:

• Reflectance measurements in the subdiffusion regime contain information about scattering.
• Current models often use optical and empirical parameters.
• A focus on fundamental physical properties offers a more universal characterization.

Purpose of the Study:

• To present methodologies for modeling and extracting tissue properties from subdiffusion reflectance spectroscopy.
• To link optical measurements to ultrastructural and microvascular characteristics.
• To demonstrate a novel approach for analyzing light-tissue interactions.

Main Methods:

• Utilizing spatially resolved subdiffusion reflectance spectroscopy.
• Applying enhanced backscattering spectroscopy techniques.
• Modeling light propagation within the subdiffusion regime.

Main Results:

• Successfully extracted tissue ultrastructural properties.
• Quantified microvascular properties from optical measurements.
• Validated the approach using ex-vivo rat tissue samples.

Conclusions:

• Fundamental physical properties provide a robust way to characterize subdiffusion reflectance measurements.
• This method enables detailed analysis of tissue microstructure and vasculature.
• Enhanced backscattering spectroscopy is a valuable tool for non-invasive tissue characterization.