en Radiation Biology Radiation Biology یادداشت فنی Technical Note <div style="text-align: justify;">Background: The aim of this study was to compare the radiation dose to ipsilateral lung and heart for different radiotherapy (RT) techniques including; two tangential photon beams, electron therapy and combined photon-electron. Materials and Methods: Treatment planning of the mentioned techniques on the CT images of a chest phantom was done using treatment planning system (TiGRT, Lina Tech, China). According to the plans, the phantom was irradiated with 6 MV photon and 10 MeV electron beams of Siemens Primus linac. Radiation dose was also measured using LiF Thermo Luminescence Dosimeter (TLD) which was placed inside 3 mm depth holes of ipsilateral lung and heart on the phantom. Results: The mean (&plusmn; SD) radiation dose to the ipsilateral lung of the combined photon-electron was 66.12 &plusmn; 5.16% of prescribed dose. Whereas for the heart, it was 64.05 &plusmn; 2.62%. Mean (&plusmn; SD) dose of ipsilateral lung and heart for electron irradiation was 54.51 &plusmn; 3.88 % and 34.21 &plusmn; 3.41%, respectively. The mean (&plusmn; SD) radiation dose to ipsilateral lung and heart of the tangential was 50.73 &plusmn; 3.01 % and 31.36 &plusmn; 3.13%, respectively. The mean (&plusmn; SD) radiation dose to the chest wall-lung interface for electron therapy (72.44 &plusmn; 2.01 %) was significantly different in comparison with tangential (65.23&plusmn; 4.20%; p = 0.045) and combined photon-electron (68.14&plusmn; 3.53 %; p = 0.032). Conclusion: Tangential beams is more suitable for treating mastectomy patients compared to the other techniques such as electron therapy and combined photon-electron, due to lower radiation dose to patient&#39;s ipsilateral lung and heart.</div> Electron beam radiation therapy, combined photon-electron beams, radiation imposed lung and heart dose, mastectomy patients, breast cancer, tangential beams. 389 394 http://ijrr.com/browse.php?a_code=A-10-1-738&slc_lang=en&sid=1 M.B. Tavakoli 7900319475328460011910 7900319475328460011910 No Medical Physics Department, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran H. Taheri h.taheri@resident.mui.ac.ir 7900319475328460011911 7900319475328460011911 Yes Medical Physics Department, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran A. Akhavan 7900319475328460011912 7900319475328460011912 No Radiotherapy and Oncology Department, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran