en Medical Physics Medical Physics تحقيق بديع Original Research Background: Radiation Pneumonia (RP) is one of the most extensive side effects in Stereotactic Body Radiotherapy (SBRT) of lung cancer. SBRT are performed by means of Intensity Modulated Radiotherapy (IMRT), Intensity Modulated Arc Therapy (IMAT), CyberKnife (CK) or Helical Tomotherapy (HT) treatment methods. In this study, we performed a plan study to determine the plan parameter such as the Mean Lung Dose (MLD), V_20GyLung Volume and V_5Gy Lung Volume in the evaluation of RP risk in the treatment of lung with SBRT. Materials and Methods: Fifteen patients with Lung Cancer who had a tumor diameter of less than 5 cm and peripheral located were included to this study. Intensity Modulated Radiotherapy, Intensity Modulated Arc Therapy, CyberKnife and Helical Tomotherapy plans were separately created for each patients. For each plan, a total of 54 Gy dose were given to Planning Target Volume (PTV) in 3 fractions using a dose of 18 Gy per fraction. Results: In each technique for all parameters of PTV and critical organ doses (OAR) meet the required criteria. Total Lung MLD were found as 3.21 Gy and Total Lung V_20Gy Volume were found as 4.05 cc,  Total Lung V_5Gy Volume were found as 14.06 cc as the lowest value in IMRT-SBRT plan. Conclusion: When treatment plans are evaluated in terms of RP risk, Total Lung MLD,  Total Lung V_20Gy Volume and Contralateral Lung V_5Gy Volume are found the lower in IMRT- SBRT plan than other SBRT techniques. We suggest that IMRT-SBRT irradiation should be preferred in lung radiotherapy in case of high RP risk. Radiation pneumonia, stereotactic body radiotherapy, ıntensity modulated radiotherapy,  ıntensity modulated arc therapy, cyberknife,  helical tomotherapy. 633 640 http://ijrr.com/browse.php?a_code=A-10-2055-47&slc_lang=en&sid=1 M. Okutan mokutan@istanbul.edu.tr 7900319475328460016833 7900319475328460016833 Yes Universty of Istanbul, Oncology Instıtute, Department of Medical Physics, Istanbul Turkey A. Franko 7900319475328460016834 7900319475328460016834 No Universty of Istanbul, Oncology Instıtute, Department of Medical Physics, Istanbul Turkey C. Köksal 7900319475328460016835 7900319475328460016835 No Universty of Istanbul, Oncology Instıtute, Department of Medical Physics, Istanbul Turkey E.O. Göksel 7900319475328460016836 7900319475328460016836 No Universty of Acibadem Mehmet Ali Aydinlar, Vocational School of Health Services, Department of Radiotherapy, Istanbul Turkey Ş. Karaman 7900319475328460016837 7900319475328460016837 No Universty of Istanbul, Oncology Instıtute, Department of Radiation Oncology, Istanbul Turkey Y. Emre Akpınar 7900319475328460016838 7900319475328460016838 No Universty of Istanbul, Istanbul Medicine Faculty, Department of Radiology, Istanbul Turkey N. Dağoğlu 7900319475328460016839 7900319475328460016839 No Universty of Istanbul, Oncology Instıtute, Department of Radiation Oncology, Istanbul Turkey B. Demir 7900319475328460016840 7900319475328460016840 No Universty of Istanbul, Istanbul Science Faculty, Department of Physics, Istanbul Turkey