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The dose response of normoxic polymer gel dosimeters measured using X-ray CT

¹ Medical Physics Section, Biomedical Engineering Services, The Canberra Hospital, POB 11 Woden, ACT 2606, ² School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane and ³ Institute of Medical Physics, School of Physics, University of Sydney, Sydney, Australia

X-ray CT was used to determine the dose response of normoxic polymer gel dosimeters. Normoxic polymer gel dosimeters were manufactured and irradiated up to 150 Gy. Up to 50 CT images were acquired on a Toshiba Aquilion Multislice CT scanner using protocols for 80 kV and 135 kV to determine dose response. HU-dose sensitivity, the linear regression of data for the HU versus dose for the linear part of the curve up to 60 Gy was 0.38±0.07 HU Gy^–1 for 135 kV and 0.37±0.01 HU Gy^–1 for 80 kV. Dose resolution was found to be < 1.3 Gy for an absorbed dose range up to 70 Gy for 135 kV, similar to that measured previously for polyacrylamide gel (PAG). Although the HU-dose sensitivity was lower than that previously measured for PAG gel dosimeters it had a greater range of absorbed dose indicating that normoxic polymer gel dosimeters have potential in CT gel dosimetry.