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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

View larger version (101K): [in a new window]   Figure 1. Water phantom and holder used to position the polymer gel dosimeters in the CT scanner. The polymer gel dosimeters are in place within the Perspex holder.

View larger version (49K): [in a new window]   Figure 2. (a) The resulting image following image averaging of the polymer gel dosimeters. (b) The resulting image following image averaging of water. (c) The resulting image following image subtraction of the averaged water image from the averaged polymer gel dosimeter image.

View larger version (33K): [in a new window]   Figure 3. The signal to noise ratios (SNR) as a function of averaged images up to 100 with: (a) different slice widths; (b) different tube current; (c) different relative pixel sizes; (d) different tube voltage; and (e) for different slice width and varying relative pixel size.

View larger version (20K): [in a new window]   Figure 4. The HU and associated uncertainty as a function of absorbed dose up to 150 Gy for a single slice in the same position averaged from 50 acquired images of the polymer gel dosimeters for different tube potentials.

View larger version (12K): [in a new window]   Figure 5. Dose resolution for an absorbed dose range for normoxic polymer gel dosimeter for 135 kV.