Monte Carlo simulation for the optical transmittance in biological tissues during the action of osmotic agents

In this paper, the optical properties of skin lesion are determined with the help of laser reflectometry. The result is compared with the phantom and simulation values to obtain an accurate result. Surface backscattering is determined by laser reflectometry. The tissue-equivalent phantom is prepared with the help of white paraffin wax mixed with various color pigments in multiple proportions. A familiar Monte Carlo simulation is used to analyze the optical properties of the tissue. The normalized backscattered intensity (NBI) signals from the tissue surface, measured by the output probes after digitization, are used to reconstruct the reflectance images of tissues in various layers below the skin surface. From NBI profiles measured at various locations of the tissues on the forearm, the corresponding optical parameters, the scattering (μ s ) and absorption (μ a ) coefficients, and the anisotropy parameter g are determined by matching these with profiles simulated by the Monte Carlo procedure. The correlation analysis between the lesion thickness and the diffuse reflectance gives the optical wavelengths which are selected for multispectral images of skin lesions. Comparison of results shows the presence of abnormal level in the tissue.

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Monte carlo simulation of signals from model biological tissues measured by an optical coherence tomograph and an optical coherence Doppler tomograph

Optics and Spectroscopy ◽

10.1134/s0030400x06070071 ◽

2006 ◽

Vol 101 (1) ◽

pp. 33-39 ◽

Cited By ~ 5

Author(s):

A. V. Bykov ◽

M. Yu. Kirillin ◽

A. V. Priezzhev

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Biological Tissues ◽

Optical Coherence ◽

Optical Coherence Tomograph

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NONLINEAR DYNAMIC OSCILLATIONS OF OPTICAL TRANSMITTANCE FOR NEMATIC LIQUID CRYSTALS AFTER THE TURN-OFF OF APPLIED ELECTRIC FIELDS

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s021886350200095x ◽

2002 ◽

Vol 11 (02) ◽

pp. 153-172 ◽

Cited By ~ 2

Author(s):

PENG-RU HUANG ◽

TZONG-SHYAN LIN ◽

JUH-TZENG LUE

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Liquid Crystal ◽

Liquid Crystals ◽

Electric Fields ◽

Applied Electric Field ◽

Optical Transmittance ◽

Matrix Formalism ◽

Relaxation Oscillations ◽

Nonlinear Relaxation

Relaxation oscillations of optical transmittance after the turn-off of the applied electric field of liquid crystals are observed when the detected light transmits through a proper adjustment of the alignment of the polarizer and analyzer. Monte Carlo simulation of the equilibrium tilting and twisting angles of molecules at each layer that yield relevant polarization of the transmitted light can satisfactorily portrait this phenomenon. Optics of an isotropic-layered liquid crystal with the extended Jones 4 × 4 matrix formalism is implemented to solve this problem. The transmittance under linear changes of temperatures also reveals similar nonlinear relaxation oscillations.

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Reconstruction of optical scanned images of inhomogeneities in biological tissues by Monte Carlo simulation

Computers in Biology and Medicine ◽

10.1016/j.compbiomed.2015.02.014 ◽

2015 ◽

Vol 60 ◽

pp. 92-99 ◽

Cited By ~ 6

Author(s):

J.B. Jeeva ◽

Megha Singh

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Biological Tissues ◽

Scanned Images

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Electron Scattering in Solids

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100133618 ◽

1990 ◽

Vol 48 (2) ◽

pp. 4-5

Author(s):

Ryuichi Shimizu ◽

Ze-Jun Ding

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Angular Distribution ◽

Elastic Scattering ◽

Electron Scattering ◽

Cross Sections ◽

Expansion Method ◽

Electron Excitation ◽

Partial Wave Expansion ◽

Backscattered Electrons

Monte Carlo simulation has been becoming most powerful tool to describe the electron scattering in solids, leading to more comprehensive understanding of the complicated mechanism of generation of various types of signals for microbeam analysis.The present paper proposes a practical model for the Monte Carlo simulation of scattering processes of a penetrating electron and the generation of the slow secondaries in solids. The model is based on the combined use of Gryzinski’s inner-shell electron excitation function and the dielectric function for taking into account the valence electron contribution in inelastic scattering processes, while the cross-sections derived by partial wave expansion method are used for describing elastic scattering processes. An improvement of the use of this elastic scattering cross-section can be seen in the success to describe the anisotropy of angular distribution of elastically backscattered electrons from Au in low energy region, shown in Fig.l. Fig.l(a) shows the elastic cross-sections of 600 eV electron for single Au-atom, clearly indicating that the angular distribution is no more smooth as expected from Rutherford scattering formula, but has the socalled lobes appearing at the large scattering angle.

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