Evaluation of breast cancer radiation therapy techniques in outfield organs of rando phantom with thermoluminescence dosimeter

Behmadi, M. and Gholamhosseinian, H. and Mohammadi, M. and Naseri, S. H. and Momennezhad, M. and Bayani, S. H. and Bahreyni Tossi, M. T. (2019) Evaluation of breast cancer radiation therapy techniques in outfield organs of rando phantom with thermoluminescence dosimeter. Journal of Biomedical Physics and Engineering, 9 (2). pp. 179-188.

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Abstract

Background: Given the importance of scattered and low doses in secondary cancer caused by radiation treatment, the point dose of critical organs, which were not subjected to radiation treatment in breast cancer radiotherapy, was measured. Objective: The purpose of this study is to evaluate the peripheral dose in two techniques of breast cancer radiotherapy with two energies. Material and Methods: Eight different plans in two techniques (conventional and conformal) and two photon energies (6 and 15 MeV) were applied to Rando Alderson Phantom’s DICOM images. Nine organs were contoured in the treatment planning system and specified on the phantom. To measure the photon dose, fortyeight thermoluminescence dosimeters (MTS700) were positioned in special places on the above nine organs and plans were applied to Rando phantom with Elekta presice linac. To obtain approximately the same dose distribution in the clinical organ volume, a wedge was used on planes with an energy of 6 MeV photon. Results: Point doses in critical organs with 8 different plans demonstrated that scattering in low-energy photon is greater than high-energy photon. In contrast, neutron contamination in high-energy photon is not negligible. Using the wedge and shield impose greater scattering and neutron contamination on patients with low-and high-energy photon, respectively. Conclusion: Deciding on techniques and energies required for preparing an acceptable treatment plan in terms of scattering and neutron contamination is a key issue that may affect the probability of secondary cancer in a patient. © 2019, Shiraz University of Medical Sciences. All right reserved.

Item Type: Article
Additional Information: Cited By :1 Export Date: 16 February 2020 Correspondence Address: Bahreyni Tossi, M.T.; Mashhad University of Medical Sciences, Medical Physics Research CenterIran
Uncontrolled Keywords: Breast Cancer Photon Dose Measurement Radiation Therapy Rando Phantom Thermoluminescence Dosimeter Article calibration cancer radiotherapy computer assisted tomography digital imaging and communications in medicine dosimetry intensity modulated radiation therapy light scattering neutron nonhuman radiation dose radiation dose distribution treatment planning
Subjects: QZ pathology-neoplasms-Genetics
Divisions: Mashhad University of Medical Sciences
Depositing User: mr lib1 lib1
Date Deposited: 21 Jun 2020 05:01
Last Modified: 21 Jun 2020 05:01
URI: http://eprints.mums.ac.ir/id/eprint/18286

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