Performance evaluation of MRI-based PAGAT polymer gel dosimeter in an inhomogeneous phantom using EGSnrc code on a Co-60 machine

Relative isodose curves were obtained using PAGAT gel dosimeter on homogeneous and inhomogeneous phantoms. Distance-to-agreement (DTA) was calculated between simulated and measured values for both the homogeneous and inhomogeneous phantoms. All DTAs except one passed the acceptance criterion (±5 dose variation for selected isodose levels). Results of this study also showed the ability of the Monte Carlo modeling to provide accurate dosimetry, and revealed that the dose response of PAGAT polymer gel is dependent on the method of fabrication.