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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">bioph</journal-id><journal-title-group><journal-title xml:lang="ru">Biomedical Photonics</journal-title><trans-title-group xml:lang="en"><trans-title>Biomedical Photonics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2413-9432</issn><publisher><publisher-name>Non-profit partnership for development of domestic photodynamic therapy and photodiagnosis</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.24931/2413-9432-2026-15-1-19-29</article-id><article-id custom-type="elpub" pub-id-type="custom">bioph-774</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group></article-categories><title-group><article-title>Исследование методов моделирования распространения света в многослойных биологических тканях для расчета поглощенной дозы лазерного излучения</article-title><trans-title-group xml:lang="en"><trans-title>Investigation of methods for modeling light propagation in multilayer biological tissues for calculating the absorbed dose of laser radiation</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кривецкая</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Krivetskaya</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><email xlink:type="simple">annakrivetskaya1998@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Савельева</surname><given-names>Т. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Savelieva</surname><given-names>T. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кустов</surname><given-names>Д. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Kustov</surname><given-names>D. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Левкин</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Levkin</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Харнас</surname><given-names>С. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Kharnas</surname><given-names>S. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лощенов</surname><given-names>В. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Loschenov</surname><given-names>V. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Москва</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Институт общей физики им. А.М. Прохорова Российской академии наук; Национальный исследовательский ядерный университет «МИФИ»<country>Россия</country></aff><aff xml:lang="en">Prokhorov General Physics Institute of the Russian Academy of Sciences; Institute of Engineering Physics for Biomedicine, National Research Nuclear University MEPhI<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Институт общей физики им. А.М. Прохорова Российской академии наук<country>Россия</country></aff><aff xml:lang="en">Prokhorov General Physics Institute of the Russian Academy of Sciences<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru">Университетская Клиническая больница №1 Первого МГМУ им. Сеченова<country>Россия</country></aff><aff xml:lang="en">Department of Faculty Surgery No. 1, I.M. Sechenov First Moscow State Medical University<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>18</day><month>04</month><year>2026</year></pub-date><volume>15</volume><issue>1</issue><fpage>19</fpage><lpage>29</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Кривецкая А.А., Савельева Т.А., Кустов Д.М., Левкин В.В., Харнас С.С., Лощенов В.Б., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Кривецкая А.А., Савельева Т.А., Кустов Д.М., Левкин В.В., Харнас С.С., Лощенов В.Б.</copyright-holder><copyright-holder xml:lang="en">Krivetskaya A.A., Savelieva T.A., Kustov D.M., Levkin V.V., Kharnas S.S., Loschenov V.B.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.pdt-journal.com/jour/article/view/774">https://www.pdt-journal.com/jour/article/view/774</self-uri><abstract><p>Изучение процессов взаимодействия излучения в оптическом диапазоне длин волн с биологическими тканями может применяться для различных биомедицинских применений, в том числе для оценки поглощенной дозы лазерного излучения при проведении лазерно-индуцированной терапии. Оценка доли поглощенного излучения может осуществляться при помощи моделирования методами Монте-Карло и удвоения-добавления. В данной работе проведен сравнительный анализ результатов моделирования двумя методами для многослойных моделей биологических тканей трахеи и толстой кишки. Оба метода применены для расчета поглощенной дозы по заданным оптическим свойствам тканей при нескольких видах освещения. Схожие геометрии пучка падающего излучения показали повторяемость с точностью 94Ѓ}3% для коллимированного пучка и 95Ѓ}3% для изотропного/диффузного источника. Преимуществом метода удвоения-добавления является большая вычислительная скорость по сравнению с методом Монте-Карло, в товремя как при моделировании методом Монте-Карло можно варьировать большее количество параметров при задании условий освещения образца. Полученные данные могут использоваться для оптимизации дозиметрии в фотодинамической терапии.</p></abstract><trans-abstract xml:lang="en"><p>Studying the interaction of optical wavelength radiation with biological tissues can be used in various biomedical applications, including estimating the absorbed dose of laser radiation during laser-induced therapy. The fraction of absorbed radiation can be estimated using Monte Carlo and adding-doubling simulations. In this paper, we compare the simulation results obtained using the two methods for multilayered models of biological tissues of the trachea and colon. Both methods are used to calculate the absorbed dose based on the specified optical properties of tissues under several types of illumination. Similar incident beam geometries demonstrated repeatability of 94Ѓ}3% for a collimated beam and 95Ѓ}3% for an isotropic/diffuse source. The advantage of the adding-doubling method is its higher computational speed compared to the Monte Carlo method, while Monte Carlo simulation allows for varying a larger number of parameters when specifying the illumination conditions of the sample. The data obtained can be used to optimize dosimetry in photodynamic therapy.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>оптическое свойство</kwd><kwd>метод удвоения-добавления</kwd><kwd>метод Монте-Карло</kwd><kwd>многослойная биологическая ткань</kwd><kwd>поглощенная доза</kwd><kwd>лазерная дозиметрия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>optical property</kwd><kwd>adding-doubling method</kwd><kwd>Monte Carlo method</kwd><kwd>multilayer biological tissue</kwd><kwd>absorbed dose</kwd><kwd>laser dosimetry</kwd></kwd-group><funding-group xml:lang="en"><funding-statement>The work was funded by the Russian Science Foundation, grant No. 25-25-00516.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Star W.M. 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