JOURNAL DESCRIPTION
The Medical Radiology and Radiation Safety journal ISSN 1024-6177 was founded in January 1956 (before December 30, 1993 it was entitled Medical Radiology, ISSN 0025-8334). In 2018, the journal received Online ISSN: 2618-9615 and was registered as an electronic online publication in Roskomnadzor on March 29, 2018. It publishes original research articles which cover questions of radiobiology, radiation medicine, radiation safety, radiation therapy, nuclear medicine and scientific reviews. In general the journal has more than 30 headings and it is of interest for specialists working in thefields of medicine¸ radiation biology, epidemiology, medical physics and technology. Since July 01, 2008 the journal has been published by State Research Center - Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency. The founder from 1956 to the present time is the Ministry of Health of the Russian Federation, and from 2008 to the present time is the Federal Medical Biological Agency.
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Medical Radiology and Radiation Safety. 2017. Vol. 62. No. 5. P. 40-46
RADIATION THERAPY
DOI: 10.12737/article_59f2fe1f592407.71438587
A Correlation between Radiotherapy Dose on the Mediastinal Lymphoma and Cardiovascular Dose with Using Respiratory Control System
E.V. Filatova, O.N. Lamanova, P.V. Filatov, A.A. Zheravin
E.N. Meshalkin Siberian Federal Biomedical Research Center, Novosibirsk, Russia, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
E.V. Filatova – Medical Physicist; O.N. Lamanova – Radiologist; P.V. Filatov – Medical Physicist; A.A. Zheravin – PhD Med., Head of Oncology and Radiology Center
Abstract
Purpose: To find a correlation between prescribed dose on the irradiation area and dose on heart and ascending aorta, using the breath holding method in classical radiotherapy course for patients with Hodgkin and non-Hodgkin mediastinal lymphomas.
Material and methods: For patients of reproductive age with diagnose Hodgkin, non-Hodgkin mediastinal lymphomas we conducted radiotherapy with contouring of tumor and critical structures, include heart and ascending aorta. Radiotherapy was conducted on breath holding (ABC) for shielding radiation dose from heart, ascending aorta and lungs. We did calculations of length and diameter of the contoured aorta and dose that it and heart took. Also, we did correlation calculation of relationship between prescribed dose on the tumor and doses cover to the heart and aorta on 6 and 10 MV nominal energies.
Results: According to the protocol RTOG 1005 for the heart zone, exceeding the threshold level for V20 < 5 % occurred in 11 cases out 21, and 8 cases from them are for 10 MV energy. For V10 < 30 % it happened in nine cases from 21, and seven cases from them are for 10 MV energy too. The correlation coefficient between the prescribed dose and the received dose for protocol RTOG 1005 V10 < 30 % was 0.71 and it showed the highest value. This index is lower on 13 % for protocol RTOG 0623 (V67) – 0.58, and it has the weakest coefficient correlation (V33) – 0.45. The value of the correlation coefficient for the aorta decreased with an increase in the volume to which the prescribed dose of the irradiation area falls and, consequently 10 and 20 % of the aorta volume is getting a maximum value from the prescribed dose.
Conclusion: Our research showed what contouring of ascending aorta is obligatorily procedure, because the average dose on it was 10.73 Gy for 10 MV and 6.50 Gy for 6 MV energies. It is obvious that using 6 MV energy is more organ-preserving method of the radiotherapy treatment when using such techniques as ABC. It is a very important to study the issue of the permissible dose per volume of ascending aorta without critical consequences for cardiovascular system. In addition, it particularly important if we take into account that all patients had a chemotherapy course before radiation therapy which also caused cardiotoxicity.
Key words: mediastinal lymphoma, radiation therapy, respiratory control system, cardiotoxicity, cardiovascular system, heart, ascending aorta
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For citation: Filatova EV, Lamanova ON, Filatov PV, Zheravin A.A. Correlation between Radiotherapy Dose on the Mediastinal Lymphoma and Cardiovascular Dose with Using Respiratory Control System. Medical Radiology and Radiation Safety. 2017;62(5):40-6. Russian. DOI: 10.12737/article_59f2fe1f592407.71438587
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