The effects of hydrogenous medium on MRI image of MAGICA gel dosimeter

摘要

however the resolution of gel dosimeter is strongly dependant to gel composition, The proper parameters and selection of optimum method in dose response readout can reduce noise and improve some important features such as contrast and spatial resolution considerably. One method for dose response readout in gel dosimetry is variation of magnetic properties of proton using magnetic resonance imaging (MRI). A major problem in this method, is the serious reduction of contrast in edges when results in lost of dose in those region. In this study a new method contrast enhancement of gel dosimeter with MR image is presented, in doses lower than 17 Gy with imaging in water medium, a small reduction in spatial resolution is exchange to considerable increase of contrast in R2 map is important.