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KMID : 1001220120140020015
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Journal of the Korean Society of Digital Medical Imaging Technology
2012 Volume.14 No. 2 p.15 ~ p.22
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Evaluation of effective dose in panorama, cone beam CT and the usefulness of x-ray protective
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Kim Jae-In
Choi Weon-Keun
Lee So-Ra
Lee Jeong-Hwa
Lee Kwan-Sup
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Abstract
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The purpose of this study was to measure the absorbed dose and calculate the effective dose for cone beam computed tomography (CBCT) and panorama units and to estimate usefulness of x-ray protective. Rando phantom and glass dosimeters were used for dosimetry. The absorbed doses were measured at 15 organs and 14 remainder from correspond to ICRP 2007 recommendations. The absorbed dose was highest in salivary glands as measured CBCT 2.420mGy, panorama 0.307mGy. Absorbed dose in another organs were high in order of thyroid, brain, skin, esophagus. The effective dose was CBCT 0.100mSv, panorama 0.011mSv and effective dose of panorama was higher than that of CBCT by 10 times. In case of wearing x-ray protective, reducing effective dose of CBCT by 0.066mSv (66%) and panorama by 0.008mSv (72%). Effective dose were reduced by radiological shielding but it needs further optimization studies, where dosimetric data are analyzed in combination with image quality with keep the patients’ exposure as low as possible.
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KEYWORD
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Panorama radiography, CBCT, Absorbed dose, Effective dose
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