Penetration depth of linear polarization imaging for two-layer anisotropic samples

Area of Science:

• Biomedical Optics
• Medical Imaging
• Photonics

Background:

• Polarization imaging effectively suppresses multiply scattered light, enhancing image quality for superficial tissues.
• Accurate diagnosis of skin abnormalities relies on understanding light penetration in tissues.

Purpose of the Study:

• To quantitatively examine and compare the penetration depths of three polarization imaging techniques: LDPI, DOLPI, and RLPI.
• To evaluate the influence of sample properties and imaging parameters on penetration depth.

Main Methods:

• Experimental measurements and Monte Carlo simulations were used to analyze a two-layer sample (isotropic and anisotropic media).
• Penetration depths of LDPI, DOLPI, and RLPI were quantitatively assessed.

Main Results:

• All three techniques exhibited characteristic depths on the order of the transport mean free path length of the top layer.
• LDPI and DOLPI penetration depths varied with incident polarization angle.
• RLPI demonstrated a characteristic depth approximately twice that of LDPI and DOLPI, increasing with g (anisotropy parameter).

Conclusions:

• The distinct penetration depth behaviors of LDPI, DOLPI, and RLPI are important for their clinical application in skin abnormality diagnosis.
• Understanding these behaviors aids in selecting appropriate polarization imaging techniques for specific diagnostic needs.