Dosimetric Verification for Implementation of Intensity Modulated Radiation Therapy (IMRT) Validates Using Polymer Gel

Abstract

Polymer gel dosimeter is a technique that has the ability to map absorbed radiation dose distributions in three dimensions (3D) with high spatial resolution, it offers a number of advantages over traditional dosimeters such as ionization chambers, thermo luminescent dosimeters (TLD) and radiographic film. These gels are reproducible in response and stable 0n post-irradiation. It is used as the monomer N-iso propyl acryl amide (NIPAM) and N, N–methylene bis acryl amide (Bis) as the cross linker. A historical overview of gel dosimeter was discussed in detail, inside the theses this case; nearly all data met the expected measurement error of 5 % of the maximum dose (50cGy). Relative errors were determined to decrease from 25 % at a 2Gy irradiation to 9.2% for a 10Gy irradiation The NIPAM polymer gel dosimeter system proved to be an invaluable method for the quantification of the 3-D dose distribution provided by IMRT. A measurement error of less than 5% was achieved. Toxicity and uncertain response to particular environmental characteristics (i.e., temperature and aging) upon the gel are of important concern about the use of the gel at this time. A PAG gel dosimeter is a method verifying dose delivered for prostate cancer

radiotherapy treatment, which has been evaluated in this work.