Evaluation of uncertainties in magnetic resonance images (MRI) associated with radiotherapy treatment planning using head phantom with dosimeter gel

Dosimeters gels, in particular polymeric gels, are used to evaluate three-dimensional dose distribution in radiotherapy treatments. Thus, polymer gel dosimeters allow a volumetric and not point visualization, as occurs with an ionization chamber. Therefore, this work consisted in evaluating the planning of cancer treatment for the head region using a phantom of the anatomical area filled with gels. Next, tomographic images (computed tomography scan) were generated, which were used for virtual planning and mathematically evaluated. After irradiating the phantom set in a medical linear accelerator, the next step was to submit the simulator to magnetic resonance (MRI) where images were mathematically post-processed. Thus, uncertainties associated at this stage of the process were evaluated. (author)