radhydРадиационная гигиенаRadiatsionnaya Gygiena = Radiation Hygiene1998-426X2409-9082NIIRG10.21514/1998-426X-2017-10-1-56-64radhyd-497Research ArticleНаучные статьиScientific articlesСравнение расчетных методов определения эффективной и органных доз у пациентов при компьютерно-томографических исследованияхA comparison of computational methods for estimation of effective and organ doses to the patients from CT examinationЧипигаЛ. А.ChipigaL. A.

младший научный сотрудник

larisa.chipiga@gmail.comСанкт-Петербургский научно-исследовательский институт радиационной гигиены имени профессора П.В. Рамзаева, Федеральная служба по надзору в сфере защиты прав потребителей и благополучия человека, Санкт-Петербург, Северо-Западный медицинский исследовательский центр им. В.А. Алмазова, Министерство здравоохранения Российской ФедерацииРоссияSaint-Petersburg Research Institute of Radiation Hygiene after Professor P.V. Ramzaev, Federal Service for Surveillance on Consumer Rights Protection and Human Well-Being, North-West Medical Research Centre after V.A. Almazov, The Ministry Of Health Of The Russian FederationRussian Federation2017050420171015664Copyright © Чипига Л.А., 20172017Чипига Л.А.Chipiga L.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.radhyg.ru/jour/article/view/497

В работе определены значения эффективных и органных доз у пациентов при проведении компьютерно-томографических исследований различных анатомических областей тела: голова, грудная клетка, брюшная полость, грудная клетка + брюшная полость + таз на наиболее распространенных типах томографов. Оценка доз осуществлялась с использованием компьютерных программ CT-Expo, XCATdose, NCICT и коэффициентов перехода от значений произведения дозы на длину сканирования к эффективной дозе согласно Методическим указаниям «Контроль эффективных доз облучения пациентов при проведении медицинских рентгенологических исследований» (МУ 2.6.1. 2944-11). Результаты расчета доз в органах показали, что их значения, полученные с помощью различных программ, не существенно различаются между собой. 98% значений органных доз имели отклонение не выше 20% от среднего значения, рассчитанного с помощью трех вышеуказанных программ, а 71% – не превышали 10%. Различия в дозах между воксельным и математическим (MIRD-5) фантомами не превышали 22%. Для сканирования головы наблюдалось двукратное завышение эффективной дозы, оцененное на основе данных МУ 2.6.1. 2944-11, по сравнению с расчетами по программам. Для исследований других анатомических областей тела различия в эффективной дозе были незначительными.Результаты сравнения эффективных доз, определенных согласно МУ 2.6.1. 2944-11, с эффективными дозами, определенными с помощью специализированных  компьютерных программ, показали применимость МУ 2.6.1. 2944-11 для заполнения форм государственной отчетности (Форма 3-ДОЗ) и оценки риска при обосновании КТ-исследования (МР 2.6.1.098-15).

The current study was devoted to estimation of effective and organ doses to the patients from the most common computed tomography (CT) examinations: head, chest, abdomen, chest+abdomen+pelvis in advanced scanners. Doses were estimated using dedicated software (CT-Expo, XCATdose, and NCICT) and conversion coefficients from the dose length product (DLP) to the effective dose according to Methodicalguidance 2.6.1.2944-11 “Assessment of effective dose to the patients undergoing X-ray examinations”. Results of the estimation of organ doses using tested software programs showed a lack of significant differences. Overall, 98% of organ doses estimated by each software program had a less than 20% difference compared with the average value of doses estimated by each software and 71% had less than 10% difference. Comparison of organ doses estimated for voxel and mathematical (MIRD-5) phantoms showed a difference up to 22%. The overestimation with a factor of two, in comparison with the software codes, was observed only for effective dose for the CT examination of a head determined according to existing guidelines. For other examinations, the differences in effective doses were insignificant. The effective dose assessed according to existing guidelines can be used to fill the report forms or rough risk estimate for justification of CT examinations.

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The authors declare that there are no conflicts of interest present.