title: ÐÐ·ÑÑÐµÐ½Ð¸Ðµ Ð²Ð»Ð¸ÑÐ½Ð¸Ñ Ð¼ÐµÑÐ°Ð»Ð»Ð¸ÑÐµÑÐºÐ¸Ñ Ð¾Ð±ÑÐµÐºÑÐ¾Ð² Ð² ÑÐ°ÑÑÐ¸ÑÐ¸ÑÐµÐ»ÑÑ ÑÐºÐ°Ð½ÐµÐ¹ Ð½Ð° ÐºÐ°ÑÐµÑÑÐ²Ð¾ Ð´Ð¾Ð·Ð¸Ð¼ÐµÑÑÐ¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð¿Ð»Ð°Ð½Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Study of the influence of metal objects of tissue expander on the quality of dosimetric planning
Creators: name: ÐÐ°Ð½ÑÐµÐ½ÐºÐ¾, ÐÐ¸ÑÐ°Ð»Ð¸Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2023
Subjects: Ð¿Ð¾ÑÑÐ¼Ð°ÑÑÑÐºÑÐ¾Ð¼Ð¸ÑÐµÑÐºÐ°Ñ Ð»ÑÑÐµÐ²Ð°Ñ ÑÐµÑÐ°Ð¿Ð¸Ñ
Ð¼ÐµÑÐ°Ð»Ð»Ð¸ÑÐµÑÐºÐ¸Ð¹ ÐºÐ»Ð°Ð¿Ð°Ð½
ÑÐºÐ°Ð½ÐµÐ²ÑÐ¹ ÑÐ°ÑÑÐ¸ÑÐ¸ÑÐµÐ»Ñ Ð¼Ð¾Ð»Ð¾ÑÐ½Ð¾Ð¹ Ð¶ÐµÐ»ÐµÐ·Ñ
Ð´Ð¾Ð·Ð¸Ð¼ÐµÑÑÐ¸ÑÐµÑÐºÐ¸Ðµ Ð¾ÑÐºÐ»Ð¾Ð½ÐµÐ½Ð¸Ñ
Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼ Ð¾ÐºÐ¾Ð½ÑÑÑÐ¸Ð²Ð°Ð½Ð¸Ñ
Ð°ÑÑÐµÑÐ°ÐºÑÑ
post-mastectomy radiation therapy
metal valve
breast tissue expander
dosimetric deviations
contouring algorithm
artifacts

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description: This work is devoted to the study of dosimetric deviations during postmastectomy radiation therapy in patients who have a metal valve in a tissue expander. Tasks that were solved during the study: 1. Conducting a literary analysis of the problem and developing a control experiment. 2. Identification of the main errors in the contouring of patients undergoing post-mastectomy radiation therapy with metal objects in breast tissue expanders. 3. Conducting an experiment using radiochromic films to determine dosimetric deviations in various contouring options. 4. Development of a universal algorithm for contouring the above patients. The work was carried out on the basis of the radiological department of I.P. Pavlov PSPbSMU, where a significant part of the factual material was collected: conducting computed tomography of a breast phantom using CT GE Optima 520, outlining the obtained series of images by various methods and drawing up irradiation plans close to the real treatment plans of patients in the Eclipse treatment planning system, as well as conducting a film dosimetry during irradiation of a breast phantom according to the above-described irradiation plans on a Unique linear accelerator. As a result of the study, dosimetric deviations were analyzed with various contouring methods, the maximum difference was about 8%. The minimum deviation was achieved when contouring according to the developed algorithm and amounted to 2%, which leads to the conclusion that this algorithm can be used for contouring patients, even when scanning without including an extended curve.