Multiple scattering model for the penetration depth of low-coherence enhanced backscattering

Area of Science:

• Biomedical Optics
• Medical Imaging
• Light Scattering

Background:

• Low-coherence enhanced backscattering (LEBS) is a depth-selective phenomenon.
• LEBS is sensitive to tissue optical properties, making it useful for disease diagnosis, especially precancerous conditions.

Purpose of the Study:

• To accurately predict the penetration depth of LEBS signals in biological tissue.
• To understand how optical properties affect LEBS penetration depth for targeted precancer detection.

Main Methods:

• Quantified the effects of reduced scattering coefficient (μs'), phase function, and spatial coherence length (Lsc) on LEBS penetration depth.
• Developed and validated an empirical expression for predicting LEBS penetration depth in the multiple scattering regime.

Main Results:

• LEBS penetration depth primarily depends on Lsc, μs', and anisotropy factor (g).
• Higher moments of the phase function have minimal impact on LEBS penetration depth.
• The derived empirical expression accurately predicts average penetration depth across various optical properties and coherence lengths.

Conclusions:

• Accurate prediction of LEBS penetration depth is vital for effective disease diagnosis.
• The developed empirical model provides a reliable tool for estimating LEBS penetration depth in scattering media.
• This work advances the application of LEBS for non-invasive tissue analysis and disease detection.