Optical parameters of embedded abnormalities in tissues as determined by Monte Carlo simulation

Area of Science:

• Biomedical optics
• Medical imaging physics
• Tissue optical properties

Background:

• Understanding photon propagation in biological tissues is crucial for developing optical diagnostic techniques.
• Tissue phantoms allow controlled investigation of light-tissue interactions.
• Deep-seated abnormalities detection remains a challenge in optical imaging.

Purpose of the Study:

• To investigate how different embedded tissues (adipose, spleen) within a heart tissue phantom affect photon propagation and backscattered light.
• To assess the feasibility of using backscattered light variations for detecting embedded tissue abnormalities.
• To evaluate the performance of a Monte Carlo simulation with a source-detector model for this purpose.

Main Methods:

• Monte Carlo simulations were employed to model photon propagation through tissue phantoms.
• Phantoms consisted of heart tissue with embedded adipose and spleen tissues.
• Simulations involved scanning the phantom surface with a light source and four detectors.

Main Results:

• Variations in backscattered light intensity were observed corresponding to the embedded adipose and spleen tissues.
• Adipose tissue enhanced the backscattered fraction, while spleen tissue decreased it, measured at 2 mm from the input fiber.
• These alterations were evident in surface scan profiles and reconstructed images.

Conclusions:

• The type of embedded tissue significantly alters the backscattered light fraction.
• This differential response holds potential for detecting deep-seated abnormalities based on optical properties.
• The simulation model effectively demonstrated variations in light scattering due to tissue heterogeneity.