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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">vestim</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной  академии наук Беларуси. Серия медицинских наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus, Medical series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1814-6023</issn><issn pub-type="epub">2524-2350</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1814-6023-2021-18-2-244-251</article-id><article-id custom-type="elpub" pub-id-type="custom">vestim-767</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>КЛИНИЧЕСКАЯ И ЭКСПЕРИМЕНТАЛЬНАЯ МЕДИЦИНА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CLINICAL AND EXPERIMENTAL MEDICINE</subject></subj-group></article-categories><title-group><article-title>Количественная оценка дозиметрических параметров плана лучевого лечения при незапланированном изменении схемы фракционирования</article-title><trans-title-group xml:lang="en"><trans-title>Quantitative assessment of dosimetric parameters of the radiation treatment plan for unplanned changes in the fractionation scheme</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4383-2360</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гончарова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Hancharova</surname><given-names>K. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гончарова Екатерина Викторовна ‒ аспирант</p><p>ул. Долгобродская, 23/1, 220070, г. Минск</p></bio><bio xml:lang="en"><p>Katsiaryna V. Hancharova ‒ Postgraduate student</p><p>23/1, Dolgobrodskaya Str., 220070, Minsk </p></bio><email xlink:type="simple">katsiaryna.hancharova@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4115-1326</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тарутин</surname><given-names>И. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Tarutin</surname><given-names>I. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Тарутин Игорь Германович ‒ д-р техн. наук, профессор, гл. науч. сотрудник</p><p>223040, а/г Лесной, Минский р-н</p></bio><bio xml:lang="en"><p>Igor G. Tarutin ‒ D. Sc. (Engineering), Professor, Chief Researcher</p><p>223040, Lesnoy, Minsk region </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>Петкевич</surname><given-names>М. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Piatkevich</surname><given-names>M. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Петкевич Максим Николаевич ‒ аспирант</p><p>ул. Долгобродская, 23/1, 220070, г. Минск </p></bio><bio xml:lang="en"><p>Maksim N. Piatkevich ‒ Postgraduate student</p><p>23/1, Dolgobrodskaya Str., 220070, Minsk </p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Международный государственный экологический институт имени А. Д. Сахарова Белорусского государственного университета</institution></aff><aff xml:lang="en"><institution>International Sakharov Environmental Institute of Belarusian State University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Республиканский научно-практический центр онкологии и медицинской радиологии им. Н. Н. Александрова, а/г Лесной</institution></aff><aff xml:lang="en"><institution>N. N. Alexandrov National Cancer Centre</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>04</day><month>06</month><year>2021</year></pub-date><volume>18</volume><issue>2</issue><fpage>244</fpage><lpage>251</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Гончарова Е.В., Тарутин И.Г., Петкевич М.Н., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Гончарова Е.В., Тарутин И.Г., Петкевич М.Н.</copyright-holder><copyright-holder xml:lang="en">Hancharova K.V., Tarutin I.G., Piatkevich M.N.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" 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://vestimed.belnauka.by/jour/article/view/767">https://vestimed.belnauka.by/jour/article/view/767</self-uri><abstract><p>Изменение схемы фракционирования курса лучевой терапии (ЛТ) оказывает существенное влияние на результаты лечения пациентов с онкологическими заболеваниями. Пренебрежение этими изменениями может привести к недооблучению опухолевых клеток и, как следствие, к возникновению рецидивов у пациентов, проходящих курс ЛТ. Для учета эффективности поглощенной дозы излучения существуют радиобиологические модели, позволяющие прогнозировать контроль над ростом опухоли, а также оценивать уровень токсичности в нормальных тканях после традиционной ЛТ.Цель работы – оценка эффективности поглощенной дозы при возникновении незапланированного изменения схемы фракционирования в курсе ЛТ и разработка алгоритма, позволяющего учесть перерывы в лучевом лечении.В ходе исследовательской работы произведена теоретическая оценка эффективности дозы излучения в опухоли при возникновении незапланированного перерыва в схеме лечения онкологических пациентов, построена графическая зависимость эффективности дозы излучения от длительности незапланированного перерыва в лечении пациентов для наиболее распространенных онкологических локализаций, разработан алгоритм проведения процедур ЛТ, учитывающий отклонения от запланированной схемы фракционирования.</p></abstract><trans-abstract xml:lang="en"><p>Changes in the fractionation scheme of the radiotherapy course have an impact on the results of treatment of cancer patients. If changes in the fractionation scheme are not taken into account, this leads to under-irradiation of tumor cells and a possible occurrence of subsequent relapses. There are radiobiological models in order to take into account the errors in the radiation dose delivered to the tumor. They allow predicting the tumor control, as well as the toxicity level in normal tissues after traditional RT.The objective of the work is to assess the effectiveness of the absorbed dose in the event, if the fractionation scheme in the RT course changes, and to develop an algorithm that takes into account breaks between treatment sessions.In the study, the effectiveness of the radiation dose delivered to the tumor due to a change in the total treatment time is assessed analytically, a graphical dependence of the radiation dose efficiency on the duration of the unplanned interruption in the treatment of patients is built for the most common oncological localizations, an algorithm for radiotherapy procedures taking into account deviations from the standard radiation treatment pattern is developed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>линейно-квадратичная модель</kwd><kwd>лучевая терапия</kwd><kwd>фракционирование</kwd><kwd>алгоритм</kwd><kwd>пролиферация</kwd><kwd>радиобиология</kwd><kwd>рак молочной железы</kwd><kwd>рак предстательной железы</kwd><kwd>опухоли головы и шеи</kwd></kwd-group><kwd-group xml:lang="en"><kwd>linear-quadratic model</kwd><kwd>radiotherapy</kwd><kwd>fractionation</kwd><kwd>algorithm</kwd><kwd>proliferation</kwd><kwd>radiobiology</kwd><kwd>breast tumors</kwd><kwd>prostate tumors</kwd><kwd>head and neck tumors</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Климанов, В. 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