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Optical Properties and Fluence Distribution in Rabbit Head Tissues at Selected Laser Wavelengths

The accurate estimation of skin and skull optical properties over a wide wavelength range of laser radiation has great importance in optogenetics and other related applications. In the present work, using the Kubelka–Munk model, finite-element solution of the diffusion equation, inverse adding-doubl...

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Autores principales: Shanshool, Alaa Sabeeh, Lazareva, Ekaterina Nikolaevna, Hamdy, Omnia, Tuchin, Valery Victorovich
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9413642/
https://www.ncbi.nlm.nih.gov/pubmed/36013828
http://dx.doi.org/10.3390/ma15165696
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author Shanshool, Alaa Sabeeh
Lazareva, Ekaterina Nikolaevna
Hamdy, Omnia
Tuchin, Valery Victorovich
author_facet Shanshool, Alaa Sabeeh
Lazareva, Ekaterina Nikolaevna
Hamdy, Omnia
Tuchin, Valery Victorovich
author_sort Shanshool, Alaa Sabeeh
collection PubMed
description The accurate estimation of skin and skull optical properties over a wide wavelength range of laser radiation has great importance in optogenetics and other related applications. In the present work, using the Kubelka–Munk model, finite-element solution of the diffusion equation, inverse adding-doubling (IAD), and Monte-Carlo simulation, we estimated the refractive index, absorption and scattering coefficients, penetration depth, and the optical fluence distribution in rabbit head tissues ex vivo, after dividing the heads into three types of tissues with an average thickness of skin of 1.1 mm, skull of 1 mm, and brain of 3 mm. The total diffuse reflectance and transmittance were measured using a single integrating sphere optical setup for laser radiation of 532, 660, 785, and 980 nm. The calculated optical properties were then applied to the diffusion equation to compute the optical fluence rate distribution at the boundary of the samples using the finite element method. Monte-Carlo simulation was implemented for estimating the optical fluence distribution through a model containing the three tissue layers. The scattering coefficient decreased at longer wavelengths, leading to an increase in optical fluence inside the tissue samples, indicating a higher penetration depth, especially at 980 nm. In general, the obtained results show good agreement with relevant literature.
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spelling pubmed-94136422022-08-27 Optical Properties and Fluence Distribution in Rabbit Head Tissues at Selected Laser Wavelengths Shanshool, Alaa Sabeeh Lazareva, Ekaterina Nikolaevna Hamdy, Omnia Tuchin, Valery Victorovich Materials (Basel) Article The accurate estimation of skin and skull optical properties over a wide wavelength range of laser radiation has great importance in optogenetics and other related applications. In the present work, using the Kubelka–Munk model, finite-element solution of the diffusion equation, inverse adding-doubling (IAD), and Monte-Carlo simulation, we estimated the refractive index, absorption and scattering coefficients, penetration depth, and the optical fluence distribution in rabbit head tissues ex vivo, after dividing the heads into three types of tissues with an average thickness of skin of 1.1 mm, skull of 1 mm, and brain of 3 mm. The total diffuse reflectance and transmittance were measured using a single integrating sphere optical setup for laser radiation of 532, 660, 785, and 980 nm. The calculated optical properties were then applied to the diffusion equation to compute the optical fluence rate distribution at the boundary of the samples using the finite element method. Monte-Carlo simulation was implemented for estimating the optical fluence distribution through a model containing the three tissue layers. The scattering coefficient decreased at longer wavelengths, leading to an increase in optical fluence inside the tissue samples, indicating a higher penetration depth, especially at 980 nm. In general, the obtained results show good agreement with relevant literature. MDPI 2022-08-18 /pmc/articles/PMC9413642/ /pubmed/36013828 http://dx.doi.org/10.3390/ma15165696 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Shanshool, Alaa Sabeeh
Lazareva, Ekaterina Nikolaevna
Hamdy, Omnia
Tuchin, Valery Victorovich
Optical Properties and Fluence Distribution in Rabbit Head Tissues at Selected Laser Wavelengths
title Optical Properties and Fluence Distribution in Rabbit Head Tissues at Selected Laser Wavelengths
title_full Optical Properties and Fluence Distribution in Rabbit Head Tissues at Selected Laser Wavelengths
title_fullStr Optical Properties and Fluence Distribution in Rabbit Head Tissues at Selected Laser Wavelengths
title_full_unstemmed Optical Properties and Fluence Distribution in Rabbit Head Tissues at Selected Laser Wavelengths
title_short Optical Properties and Fluence Distribution in Rabbit Head Tissues at Selected Laser Wavelengths
title_sort optical properties and fluence distribution in rabbit head tissues at selected laser wavelengths
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9413642/
https://www.ncbi.nlm.nih.gov/pubmed/36013828
http://dx.doi.org/10.3390/ma15165696
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