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KMID : 1151820190130070925
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Journal of the Korean Society of Radiology
2019 Volume.13 No. 7 p.925 ~ p.932
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Evaluation of Dose Distribution of 6 MV X-ray using Optical Dosimetry
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Kim Sung-Hwan
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Abstract
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In this paper, we developed optical dosimetry system with a plastic scintillator, a commercial 50 mm, f1.8 lens, and a commercial high-sensitivity CMOS (complementary metal-oxide semiconductor) camera. And, the correction processors of vignetting, geometrical distortion and scaling were established. Using the developed system, we can measured a percent depth dose, a beam profile and a dose linearity for 6 MV medical LINAC (Linear Accelerator). As results, the optically measured percent depth dose was well matched with the measured percent depth dose by ion-chamber within 2% tolerance. And the determined flatness was 2.8%. We concluded that the optical dosimetry system was sufficient for application of absorbed dose monitoring during radiation therapy.
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KEYWORD
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Optical Dosimetry, Plastic Scintillator, CMOS Camera, Integral Dose, Percent Depth Dose
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