Conventional dosimeters such as ionization chambers, thermoluminescent dosimeters and diodes are point dose measuring devices and therefore difficult to use for spatial evaluation of dose distributions. The film dosimeter is limited to 2D measurements, and the response is dependent of radiation direction [1]. However, using gel dosimetry, dose information can be obtained in 3D with high spatial resolution. Intensity modulated radiation therapy (IMRT) usually involves steep dose gradients in all directions. For verification of this type of treatments gel dosimetry has shown to be suitable [2–4]. The aim of this study was to investigate the feasibility of using a new type of normoxic polymer gel dosimeter and a water filled homogenous pelvis phantom with a gel insert for verification of IMRT prostate dose distributions.
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