Dr. Khalid Rabaeh
The Hashemite University, Jordan
Title: 3D Optical properties of N-(Hydroxymethyl)acrylamide polymer gel dosimeters for radiotherapy treatment planning system
Biography
Biography: Dr. Khalid Rabaeh
Abstract
Advanced treatment techniques for cancerous tumors such as intensity modulated radiotherapy (IMRT), brachytherapy, and boron nuclear capture therapy require highly conformal 3D dose distributions. For this purpose, tissue equivalent polymer gels whose nuclear magnetic resonance (NMR) and optical properties change with radiation dose could offer unique advantages for measuring radiation dose distributions in 3D. Radiation-induced polymerization N-(Hydroxymethyl)acrylamide (NHMA) gel dosimeter is introduced in this study for radiotherapy treatment planning. The phantom gels were irradiated to 8 MV photon beam of the CyberKnife robotic system up to 6 Gy. The polymerization of NHMA gels occurs and increases significantly with increasing absorbed dose. Optical computed tomography system was used to measure the 3D optical density of irradiated NHMA polymer gel dosimeters. The 3D dose distributions of irradiated phantom gels were compared to 3D simulated dose distributions of CyberKnife robotic treatment planning system (TPS). 3 mm distance-to-agreement with 3% dose difference was used to evaluate gamma analysis. The results show a very good agreement in terms of gamma pass rate between TPS and gel dosimeter, indicating NHMA gel could be used for 3D dose validation.