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KMID : 1038720160270020072
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Progress in Medical Physics
2016 Volume.27 No. 2 p.72 ~ p.78
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Characteristics of CCD Based Optical CT Scanner for Therapeutic Radiation Dosimetry
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Lee Jae-Choon
Kim Ae-Ran
Ji Young-Hoon
Kwon Soo-Il
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Abstract
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A CCD camera and an LED light source were combined to fabricate a compact optical CT scanner for the therapeutic radiation dose evaluation of a polymer gel dosimeter. After the collimated beam emitted by the LED passed through aquarium, gel phantom, and telecentric lens, an image was collected by the CCD camera and reconstructed using MATLAB. By using a stepping motor and LabVIEW, the gel dosimeter was rotated at every 0.72°, and the time for collecting 500 slice images per a revolution was within 20 min. At a spatial frequency of 4.5 lp/mm of the optical CT scanner, the modulation transfer function value was 72%. The linear correlation coefficient of the optical CT scanner for the polymer gel dosimeter was 0.987.
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KEYWORD
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Optical Computed Tomography Scanner, Polymer Gel, Dosimetry
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