Monte Carlo Simulation of Photon Transport for Computing Fluence Rate in Biological Tissue

2018 ◽  
Vol 13 (10) ◽  
pp. 1505-1513
Author(s):  
S. O. Bazara ◽  
R. S. Alanazi ◽  
A. Laref
Keyword(s):  
Monte Carlo ◽  
Absorption Coefficient ◽  
Blood Vessels ◽  
Biological Tissue ◽  
Theoretical Perspective ◽  
Biological Tissues ◽  
Point Sources ◽  
Fluence Rate ◽  
Photon Transport ◽  
Collimated Beam

In this research, we applied the Monte Carlo method to simulate photon transport in a biological tissue, consisting of epidermal, dermis, and blood vessels. Particularly, we computed the fluence rate of the system at a wavelength of 400 nm using different beam sources, such as collimated beam, Gaussian beam, and isotropic point sources. In addition, the fluence rate is calculated within the collimated beam at different wavelengths between 300–1000 nm by considering the absorption coefficient (μa) for blood, dermis, and epidermis. For the collimated beam, the resulting fluence rate was found almost similar in the case of the epidermis and dermis at wavelengths between 600–1000 nm, whereas the blood vessels occur at a wavelength of 400 nm with a maximum absorption coefficient of blood (μa) of 3586 cm–1. The present study illustrated the ability of the penetration of light in biological tissues and the escaped light could provide the information about the components of the biological tissue. From the theoretical perspective, the comprehension of light-tissue interactions can support the field of biomedical optics.

scholarly journals Effective Permittivity of Biological Tissue: Comparison of Theoretical Model and Experiment

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Li Gun ◽  
Du Ning ◽  
Zhang Liang
Keyword(s):  
Electromagnetic Fields ◽  
Biological Tissue ◽  
Volume Fraction ◽  
Biological Effects ◽  
Effective Permittivity ◽  
Theoretical Perspective ◽  
Critical Issue ◽  
Biological Tissues ◽  
Fat Liver ◽  
Lcr Meter

Permittivity of biological tissue is a critical issue for studying the biological effects of electromagnetic fields. Many theories and experiments were performed to measure or explain the permittivity characteristics in biological tissue. In this paper, we investigate the permittivity parameter in biological tissues via theoretical and experimental analysis. Firstly, we analyze the permittivity characteristic in tissue by using theories on composite material. Secondly, typical biological tissues, such as blood, fat, liver, and brain, are measured by HP4275A Multi-Frequency LCR Meter within 10 kHz to 10 MHz. Thirdly, experimental results are compared with the Bottcher-Bordewijk model, the Skipetrov equation, and the Maxwell-Gannett theory. From the theoretical perspective, blood and fat are regarded as the composition of liver and brain because of the high permittivity in blood and the opposite in fat. Volume fraction of blood in liver and brain is analyzed theoretically, and the applicability and the limitation of the models are also discussed. These results benefit further study on local biological effects of electromagnetic fields.

scholarly journals Increasing Damage to Tumor Blood Vessels during Motexafin Lutetium-PDT through Use of Low Fluence Rate

2010 ◽  
Vol 174 (3) ◽  
pp. 331-340 ◽  
Author(s):  
Theresa M. Busch ◽  
Hsing-Wen Wang ◽  
E. Paul Wileyto ◽  
Guoqiang Yu ◽  
Ralph M. Bunte
Keyword(s):  
Blood Vessels ◽  
Fluence Rate ◽  
Tumor Blood Vessels

New approach to Monte Carlo simulation of photon transport in the frequency domain

1995 ◽  
Author(s):  
Ilya V. Yaroslavsky ◽  
Anna N. Yaroslavsky ◽  
Hans-Joachim Schwarzmaier ◽  
Garif G. Akchurin ◽  
Valery V. Tuchin
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Frequency Domain ◽  
New Approach ◽  
Photon Transport

Calculation of the radiation dose absorbed by human biological tissue when using imaging equipment in radiоtherapy

2021 ◽  
pp. 56-59
Author(s):  
Irina M. Lebedenko ◽  
Sergej S. Khromov ◽  
Taras V. Bondarenko ◽  
Evgenij M. Chertenkov
Keyword(s):  
Monte Carlo ◽  
Radiation Therapy ◽  
Biological Tissue ◽  
Electron Accelerator ◽  
Absorbed Dose ◽  
Tube Voltage ◽  
X Ray ◽  
The Monte Carlo Method ◽  
Therapeutic Procedures ◽  
Dose Control

Considered the issues of X-ray dose control during diagnostic and therapeutic procedures using imaging tools. The dose of X-ray radiation from the visualization devices absorbed by the biological tissue of a person was determined when monitoring the position of the patient on the therapeutic table of the electron accelerator before the radiation therapy session. The processes of transmission of photons and electrons through the medium were simulated, and the X-ray spectra were measured. The emission spectrum of the Varian G-242 Rotating Anode X-ray Tube was obtained using an XR-100-CdTe spectrometer. The absorbed dose is calculated by the Monte Carlo method. The absorbed dose in the water phantom at tube voltage up to 80 kV was 0,9–1,5 mGy.

Handling of Collimated Irradiation on a Plane-Parallel Participating Medium

2000 ◽  
Author(s):  
Christian Proulx ◽  
Daniel R. Rousse ◽  
Rodolphe Vaillon ◽  
Jean-François Sacadura
Keyword(s):  
Heat Flux ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Radiative Heat ◽  
Radiative Heat Flux ◽  
Scattering Media ◽  
One Dimensional ◽  
Plane Parallel ◽  
Collimated Beam ◽  
Good Agreement

Abstract This article presents selected results of a study comparing two procedures for the treatment of collimated irradiation impinging on one boundary of a participating one-dimensional plane-parallel medium. These procedures are implemented in a CVFEM used to calculate the radiative heat flux and source. Both isotropically and anisotropically scattering media are considered. The results presented show that both procedures provide results in good agreement with those obtained using a Monte Carlo method, when the collimated beam impinges normally.

SIMULATION OF SINGLE CHANNEL BIOLOGICAL TISSUE SPECTROSCOPY USING COMSOL MULTIPHYSICS

2015 ◽  
Vol 77 (28) ◽  
Author(s):  
Azmi Abou Basaif ◽  
Nashrul Fazli Mohd Nasir ◽  
Zulkarnay Zakaria ◽  
Ibrahim Balkhis ◽  
Shazwani Sarkawi ◽  
...  
Keyword(s):  
Magnetic Induction ◽  
Biological Tissue ◽  
Single Channel ◽  
Medical Condition ◽  
Biological Tissues ◽  
Comsol Multiphysics ◽  
Accurate Information ◽  
Tissue Properties ◽  
Biological Soft Tissue

The enhanced ability to detect accurate location and measure the depth of a   metal inside a biological tissue is very useful in the assessment of medical condition and treatment. This manuscript proposed a solution via the measurement of the tissue properties using magnetic induction spectroscopy (MIS) method to describe the characterization of biological soft tissue. The objective of this study is to explore the viability of locating embedded metal inside a biological tissue by measuring the differences the biological tissue electrical properties using principle of Magnetic Induction Spectroscopy (MIS). Simulation is done using COMSOL Multiphysics software for accurate information on the involved parameters for both metal and biological tissues. Simulation has confirmed that MIS capable of detecting and locate embedded metal inside a biological tissue.

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