Mr. Lei Li Profile

Lei Li

at Tsinghua Univ Shenzhen International Graduate School

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Proceedings Article | 9 November 2010 Paper

Linear polarization detection of polarization-sensitive optical coherence tomography in the early detection of the application of dental caries

Lei Li, Nan Zeng, Lifeng Yang

Proceedings Volume 7845, 78452O (2010) https://doi.org/10.1117/12.870554

KEYWORDS: Dental caries, Monte Carlo methods, Polarization, Optical coherence tomography, Teeth, Tissues, Phase modulation, Scattering, Corrosion, Beam splitters

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Polarization-Sensitive Optical Coherence Tomography (PS-OCT) is an important functional OCT. By extracting the polarization properties from PS-OCT signals we can obtain more information about the structural and optical features of tissues or materials. Dental caries is one of the most prevalent chronic diseases of people worldwide. The primary caries detection and the structure transformation of the enamel and dentin between sound and broken teeth are given serious attention by dentists. In this paper, using our Fourier-domain polarization-sensitive optical coherence tomography (FD-PS-OCT) setup by three incident linear polarization states and two detection states, we can get the 9 Mueller matrix elements from M11to M33 of the decay areas of the artificial caries measured. We also applied our polarized sensitive Monte Carlo program in the simulation of the PS-OCT detection process. We used a sphere-cylinder scattering model as an approximation of anisotropic tissues to describe the optical properties of tooth. By comparing the Mueller matrix elements of both experimental and simulation results, especially the diagonal elements (M11, M22 and M33), we reach the point that the main structural change of the caries that affects its scattering features is the expanded diameter of the enamel rods and dentinal tubules caused by the acid corrosion due to caries lesion.

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