Treatment field specific IMRT QA using flat panel

Electronic portal imaging devices are commonly used for geometric verification of patient positioning during the treatment. However their use has been increasingly extended in extracting dosimetric information of the radiation treatment. To extend the use of flat panel for dosimetric purposes few characteristics of the flat panel like reproducibility, temporal stability, ghosting effect, dose-response relationship have to be studied. This work presents the use of flat panel for the relative verification of individual treatment field fluence for IMRT