Implementation And Validation Of A Commercial Portal Dosimetry Software For Intensity-Modulated Radiation Therapy Pre-Treatment Verification

Electronic portal imaging devices (EPIDs) are extensively used for obtaining dosimetric information of pre-treatment field verification and in-vivo dosimetry for intensity-modulated radiotherapy (IMRT). In the present study, we have implemented the newly developed portal dosimetry software using independent dose prediction algorithm EPIDose (TM) and evaluated this new tool for the pre-treatment IMRT plan quality assurance of Whole Pelvis with Simultaneous Integrated Boost (WP-SIB-IMRT) of prostate cases by comparing with routine two-dimensional (2D) array detector system (MapCHECK (TM)). We have investigated 104 split fields using gamma-distributions in terms of predefined < frequency parameters. The mean gamma values are found to be 0.42 (SD: 0.06) and 0.44 (SD: 0.06) for the EPIDose and MapCHECK (TM), respectively. The average 2 are 97.4%, 99.3%, and 0.56%, respectively for EPIDose and 96.4%, 99.0% and 0.62% for MapCHECKTM. Based on our results obtained with EPIDose and strong agreement with MapCHECKTM, we may conclude that the EPIDose portal dosimetry system has been successfully implemented and validated with our routine 2D array detector