Dr. Yunyao Zhang Profile

Dr. Yunyao Zhang

at Northwest Univ

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Proceedings Article | 27 March 2022 Paper

Monte Carlo study on polarization PSF for underwater imaging enhancement

Yunyao Zhang, Xinggaung Zhang, Heng Tian, Yang Dai

Proceedings Volume 12169, 12169BL (2022) https://doi.org/10.1117/12.2626976

KEYWORDS: Point spread functions, Light scattering, Underwater imaging, Polarization, Scattering, Monte Carlo methods

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Underwater imaging enhancement is challenging because the significant light attenuation along the propagation direction by the turbid water. Solving the problems caused by scattering is the core issue of improving underwater imaging. In recent years, generating a specific point spread function (PSF) has been one of the cornerstones of modern microscopy for turbid tissue, which showed that PSF still has potential for underwater imaging enhancement. As polarization imaging technology showed great potential to improve the underwater imaging, we propose to study the polarization point spread function (pPSF) of the turbid media. We used Monte Carlo method for studying optical transmission. We used polystyrene microspheres of two different diameters to be the scattering particles in the water. We studied PSF in forms of S0, S1, S2, S3, parallelly gated light and vertical gated light. The results showed that S3 has similar pattern with S0 and could be implied in 1D along polar direction. S1 was 90° rotationally symmetrical and should be studied in 2D. The pPSF of S1 changed from x direction to diagonal direction continuously along the azimuth with different speed varied with transport distance. Further study on these characteristics is of great potential for us to improve the underwater polarization imaging.

Proceedings Article | 10 February 2017 Paper

Monte Carlo model of light transport in multi-layered tubular organs

Yunyao Zhang, Jingping Zhu, Ning Zhang

Proceedings Volume 10250, 102500D (2017) https://doi.org/10.1117/12.2266742

KEYWORDS: Monte Carlo methods, Spectroscopy, Esophagus

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We present a Monte Carlo static light migration model (Endo-MCML) to simulate endoscopic optical spectroscopy for tubular organs such as esophagus and colon. The model employs multi-layered hollow cylinder which emitting and receiving light both from the inner boundary to meet the conditions of endoscopy. Inhomogeneous sphere can be added in tissue layers to model cancer or other abnormal changes. The 3D light distribution and exit angle would be recorded as results. The accuracy of the model has been verified by Multi-layered Monte Carlo(MCML) method and NIRFAST. This model can be used for the forward modeling of light transport during endoscopically diffuse optical spectroscopy, light scattering spectroscopy, reflectance spectroscopy and other static optical detection or imaging technologies.

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