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흉부(胸部) 경선질촬영(硬線質撮影)에 있어서 피폭선양(被曝線量)의 저감(低減)에 관(關)한 연구(硏究)
임태랑,석전유치,전전미향,앵정달야,김정웅,황종선,Hayashi, Taro,Ishida, Yuji,Maeda, Mika,Sakurai, Tatsuya,Kim, Chung-Woon,Hwang, Jong-Sun 대한방사선과학회 1991 방사선기술과학 Vol.14 No.2
Experiment was conducted on the image quality and exposure dose following replacement of $CaWO_4$ system screen BH-III and BX-III which have so far been used for high-voltage hard-radiation quality radiography, with rare earth system screen KO750, combined with high contrast film SRH, while additional filter was altered, Cu 0.8 mm+Al 1.4 mm(HVL : Al 8.8 mm), Cu 1.3 mm+Al 1.0 mm(HVL : Al 10.6 mm) and Cu 1.8 mm+Al 1.5 mm(HVL : Al 11.4 mm). AS a result, visual evaluation did not detect extreme changes in image quality under the respective condition(HVL : $Al\;8.8\;mm{\sim}Al\;11.4\;mm$). It was noted, however, that surface exposure dose declined with an increase in the thickness of the additional filter, as it was $18.9\;{\mu}Gy$ at HVL Al 8.8 mm, $17.5\;{\mu}Gy$ at Al 10.6 mm and $15.7\;{\mu}Gy$ at Al 11.4 mm. Considering the limited rating of X-ray equipment and wear of machinery, however, the range of $Cu\;1.3\;mm{\sim}1.8\;mm+Al\;1.0\;mm{\sim}1.5\;mm(1/16\;VL{\sim}1/32\;VL)$ seemed to be a limit.
흉부X선촬영시(胸部X線撮影時) 산란선(散亂線)이 화질(畵質)과 피폭선량(被曝線量)에 미치는 영향(影響)
반야유,임태랑,석전유치,전전미향,앵정달야,이만구,안봉선,김정민,Iino, Yu,Hayashi, Taro,Ishida, Yuji,Maeda, Mika,Sakurai, Tatsua,Lee, Man-Koo,An, Bong-Sun,Kim, Jung-Min 대한방사선과학회 1993 방사선기술과학 Vol.16 No.2
To investigate relationships between image guality and exposure dose, Chest X-ray films were evaluated for the following points:how much scattered radiation can affect reduction in image quality and can be permissible diagnostically? For this purpose using a test charts and Burger's phantoms. The visual evaluation of their X-ray films and the measurements of scattered radiation were carried out. The dose of scattered radiation ranging from 20 to 25% was found to be for nothing in any diagnostic obstacle. In this range, surface doses were low of 17, 21, and $25{\mu}Gy$ for The thickness of the chest of 15, 20 and 25 cm respectively. Comparison of these high voltage X-ray films with low voltage ones showed a surface dose rate of 1:11.7. Therefore, X-ray quality, photosensitive materials(film and screen) and grid should be selected very carefully for the purpose of reduction in exposure dose.
흉부단층촬영시(胸部斷層撮影時) 피폭선량(被曝線量)의 저감(低減)에 관(關)한 연구(硏究)
반야유,이만구,임태랑,석전유치,전전미향,앵정달야,박영희,김창남,신동식,Lino, Yu,Lee, Man-Koo,Hayashi, Taro,Ishida, Yuji,Maeda, Mika,Sakurai, Tatsuya,Park, Yong-Hee,Kim, Chang-Nam,Shin, Tong-Sik 대한방사선과학회 1994 방사선기술과학 Vol.17 No.2
Tomographic examination requires several times of exposure usually, therefore, reduction of radiation dose per exposure without loss of image quality proves of great benefit to patient. We compared the exposure doses under the following experimental conditions, A and B. A is the combination of SRO 380(rare earth screen) and SRH(high contrast film) with additional Cu filters or without. B is the widely used combination which is BH-III and Cronex-4 without additional filter. As a result, comparing with the condition B, the condition A with additional filter of Cu 0.15 mm + Al 0.7 mm, Cu 0.4 mm+ Al 0.4 mm and Cu 0.8 mm showed better Image quality and lower surface dose, 44 %, 31 % and 24 % of the condition B, respectively.