Volume 10, Issue 38 (3-2020)
NCMBJ 2020, 10(38): 29-40 |
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Safaiean S, Salehi Barough M, Shirmardi S P. Calcalation of brain and thyroid radiation scattered absorbed dose due to proton therapy of eyes using MCNPX simulation code. NCMBJ 2020; 10 (38) :29-40
URL: http://ncmbjpiau.ir/article-1-1283-en.html
URL: http://ncmbjpiau.ir/article-1-1283-en.html
Nuclear Science and Technology Research Institute (NSTRI)
Abstract: (2677 Views)
Aim and Background: Proton therapy is most advanced treatment telepathy. protons evacuates maximum energy in position called Bragg peak. Therefore, to treat cancer, the tumor must be placed at the Bragg peak or SOBP. scattered photons and neutrons is a challenge in proton radiotherapy. purpose this study was to calculate dose of scattered photons and neutrons from eye in proton therapy .
Materials and Methods: In this study, simulations was performed based on MCNPX code. For this, a spherical tumor with 0.6 cm diameter is considered in the eye phantom at a depth of 2.5 mm and bragg peak is formed excactly at the end of tumor. The eye phantom is irradiated with a proton with energy 50MeV.
Results: results show that dispersed dose of neutrons and photons due to proton therapy in eye tissue are 8.817e-14 Gy and 1.653e-13 Gy respectively, and dose of the esophagus and thyroid are 1.037e-07 Gy and 2.89e-08 Gy for the dispersed neutrons respectively, and for photons 5.11e-08 Gy and 1.58e-07 Gy.
Conclusion: The results show that in the esophagus and thyroid is insignificant dispersal dose . The scattered dose of thyroid is higher than that of esophagus, due to the proximity of this tissue to the radiation site. The results showed that less than 1% o total proton dose was dispersed to other tissues.
Materials and Methods: In this study, simulations was performed based on MCNPX code. For this, a spherical tumor with 0.6 cm diameter is considered in the eye phantom at a depth of 2.5 mm and bragg peak is formed excactly at the end of tumor. The eye phantom is irradiated with a proton with energy 50MeV.
Results: results show that dispersed dose of neutrons and photons due to proton therapy in eye tissue are 8.817e-14 Gy and 1.653e-13 Gy respectively, and dose of the esophagus and thyroid are 1.037e-07 Gy and 2.89e-08 Gy for the dispersed neutrons respectively, and for photons 5.11e-08 Gy and 1.58e-07 Gy.
Conclusion: The results show that in the esophagus and thyroid is insignificant dispersal dose . The scattered dose of thyroid is higher than that of esophagus, due to the proximity of this tissue to the radiation site. The results showed that less than 1% o total proton dose was dispersed to other tissues.
Type of Study: Research Article |
Subject:
Cellular and molecular
Received: 2020/05/13 | Accepted: 2020/05/13 | Published: 2020/05/13
Received: 2020/05/13 | Accepted: 2020/05/13 | Published: 2020/05/13
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