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KMID : 0384620120230030138
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Korean Journal of Medical Physics
2012 Volume.23 No. 3 p.138 ~ p.144
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Preliminary Investigations of the Dosimetric Properties of a Normoxic Polymethacrylic Acid Gel Dosimeter Using a Respiration-Motion Simulator
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Park Chae-Hee
Cho Yu-Ra
Cho Kwang-Hwan
Park Ji-Ae
Kim Kyeong-Min
Kim Kum-Bae
Jung Hai-Jo
Ji Young-Hoon
Gwon Soo-Il
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Abstract
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Dose distribution throughout the clinical organ range of motion was analyzed using a respiratory-motion simulator that was equipped with a polymer gel dosimeter and EBT2 film. The normoxic polymer gel dosimeter was synthesized from gelatin, MAA, HQ, THPC and HPLC. The gel dosimeter and EBT2 film were irradiated with Co-60gamma rays that were moved along the x-axis and y-axis in ±1.5 cm steps at five-second intervals. The field size was 5×5 cm2. The SSD was 80 cm and set to 10 Gy at a depth of 2 cm. The PDD at a depth of 50mm was 75.2% in the ion chamber, 82.3% in the static state and 86.1% in the dynamic state in the gel dosimeter. The penumbra for the dynamic state target, which was measured using the gel dosimeter, averaged 10.89 mm, this is a 40.5% increase over the penumbra of the static state target of 7.74 mm. In addition, when measuring with gel dosimetry, the value for the penumbra is 36.6% smaller in the static state and 29.4% smaller in the dynamic state compared to measuring with film. The aim of this study was to investigate the dosimetric properties of a normoxic polymethacrylic acid gel dosimeter in static and dynamic states and to evaluate the potentiality as a relative dosimeter for dynamic therapeutic radiation.
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KEYWORD
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Polymer gel dosimeter, Film, Moving target, Dose response
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