EVALUATION STUDY FOR ELECTRONIC PORTAL IMAGER SYSTEM DEVICE (EPID) AS QUALITY ASSURANCE AND DOSIMETRY TOOL FOR MEDICAL LINEAR ACCELERATOR MACHINE

Abstract

Portal imager system now is widely attached as verification system in many models from linear accelerator due to may be used for treatment verification instead of film in as new ear for radiotherapy. The portal imager system has good properties for verification using imaging model and now with better treatment calculation algorithms for use as pretreatment verification for dose evaluation for some new radiotherapy techniques, and modern treatment delivery machines and modes of delivery, to improve possible for using the EPID the conventional Quality Assurance (QA) standards. The current study was done used linear accelerator Varian (model UNIQUETM), which has single photon energy 6 MeV with different dose rate steps start from 100 MU/min. to 600 MU/min equipped by portal imager system aS500, absolute dosimetry system for standard nbilarbilac (farmer Ion chamber TM30013, MP3 water phantom and UNIDOS E TM