TY - JOUR ID - 12840 TI - Camera based EPID dosimetric verification of radiation treatments JO - Iranian Journal of Medical Physics JA - IJMP LA - en SN - AU - Nazari, Vahideh AU - Mahdavi, Seied Rabi AU - Mostaar, Ahmad AU - Nedaei, Hassan AU - Mosleh Shirazi, Mohammad Amin AU - esmailie, Golbarg AD - Medical Physics Department, Faculty of Medicine, Hamedan University of Medical Sciences, Hamedan, Iran. AD - Medical Physics Department, Iran University of Medical Sciences, Tehran, Iran AD - Medical Physics and Biomedical Engineering Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran AD - Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran AD - Medical Physics Department, Shiraz University of Medical Sciences, Shiraz, Iran Y1 - 2018 PY - 2018 VL - 15 IS - Special Issue-12th. Iranian Congress of Medical Physics SP - 217 EP - 217 KW - Camera based EPID KW - dosimetry verification DO - 10.22038/ijmp.2018.12840 N2 - Introduction: Tumor control and treatment quality depend on accuracy of delivered dose. Various methods have been studied for treatment dosimetry verification. Among these methods, the use of electronic portal imaging device (EPID) is highly considered. Many efforts are underway to improve the results of this context.   Materials and Methods: In this study, a new method for pretreatment dose verification is reported using the transmitted signal of a camera based EPID. Lateral scatter within imager has been considered as field size dependent additive operation. Lateral scatter description within the imager were obtained from measurements with a 2D array ionization chambers for a set of different field sizes. The water-equivalent thickness of phantom material was defined for dose reconstruction, by means of the treatment planning system, according to the patient's data in CT scans along the beam central axis.   Results: The method was tested for pretreatment verification of 3D conformal prostate cancer treatment plans. There are no significant differences between the EPID and ionization chamber responses (P value = 0.37).   Conclusion: This study proposes a practical method with easier and less calculations in comparison to the deconvolution approaches that can be applied for overall dosimetric assessments of treatments in every fraction. UR - https://ijmp.mums.ac.ir/article_12840.html L1 - ER -