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- 저자 : 왕태욱(Tae Uk Wang) (검색결과 3 건)
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전산화단층촬영에서 신체조건에 따른 자동노출과 수동노출의 차이에 대한 연구
왕태욱(Tae Uk Wang),박재훈(Jae Hoon Park),방순욱(Soon Uk Bang),범희남(Hyi Nam Bum),임채평(Chae Pyeong Lim) 대한CT영상기술학회 2007 대한CT영상기술학회지 Vol.9 No.1
Purpose To minimize the radiation exposure during the computed tomography (CT) examination, the practical amount of radiation exposure was reviewed in terms of anthropometric characteristics of the examinees and the methods of exposure control - automatic and manual. Materials and Methods During 5 months from March to July 2006, radiation exposure data of 200 examinees who had either chest or abdominal CT examination were collected from 16 channel slice multidetector row CT (16 slice MDCT, equipment A) and 64 channel slice multidetector row CT (64 slice MDCT, equipment B) in Hwasun Chonnam national University Hospital. Data were analyzed in relation to examinee’s body mass index (BMI), age, sex and noise index. The difference of radiation exposure between automatic and manual exposure control were also analyzed respectively Results Of total 400 examinees (267 men and 133 women), the amount of radiation exposure was significantly correlated with BMI, body weight and the noise index. The noise index was positively related with body weight. In both equipments, the automatic exposure generally showed lower radiation exposure than manual exposure. The radiation exposure in abdominal examination in e quipment A, however, showed higher radiation exposure in the automatic exposure than in the manual exposure, although statistically insignificant. The exposure levels were higher in the automatic exposure in the 82 percent of abdominal examinees for the equipment A. Conclusion Generally speaking, the automatic exposure method are superior to the manual exposure method to minimize the amount of radiation exposure during the CT examination. But this is not always the case. This study suggest that all the exposure protocol for the CT examination be reviewed through practical evaluation at the actual settings.
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흉부 전산화단층촬영검사를 위한 최적의 저선량 프로토콜에 관한 팬텀연구
김영근(Young-Keun Kim),양숙(Sook Yang),왕태욱(Tae-uk Wang),김은혜(Eun-Hye Kim) 대한방사선과학회(구 대한방사선기술학회) 2021 방사선기술과학 Vol.44 No.2
The purpose of this study was to evaluate optimal CT scan parameters to minimize patient dose to the irradiation and maintain satisfactory image quality in low-dose chest computed tomography (CT) scans. In a chest anthropomorphic phantom, chest CT scans were performed at different kVp and mA within reference of 3.4mGy in volume CT Dose Index (CTDIvol). The following quantitative parameters had been statistically evaluated: image noise, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and figure of merit (FOM). Nine radiographers conducted the blind test to select the optimal kVp-mA combination. Results indicated that the kVp-mA combination of 80kVp-90mA, 100kVp-50mA, 120kVp-30mA and 140kVp-30mA were obtained high SNR and CNR. The 120kVp-30mA combination offered good compromise in the FOM, which showed the quality and dose performance. In the blind test, an image of 80kVp-90mA obtained a high score with 4.7 points, and 120kVp-10mA or 140kVp-10mA with a low tube current were observed severe noise and poor image quality, thus resulting in decreased diagnostic accuracy. On the other hand, in the combination of high kVp and high mA(140kVp-90mA), the image quality was improved, but the radiation dose was also increased. the FOM value of 140kVp-90mA was lower than 120kVp-30mA. The application of appropriate scan parameters in low-dose chest CT scans produced satisfactory results in dose and image quality for the accuracy of the clinical diagnosis.
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Standard와 MAR 알고리즘에서 CT 검사조건 변화에 따른 인공물과 노이즈 평가
김영근(Young-kuen Kim),양숙(Sook Yang),왕태욱(Tae-uk Wang) 대한방사선과학회(구 대한방사선기술학회) 2020 방사선기술과학 Vol.43 No.2
The influence of metal artifact in CT image depends on the type of metal materialsm, the reconstruction algorithm, and scan parameters. The presence of metal artifacts was quantitatively evaluated by applying the standard and MAR algorithms through the phantom study. In the change of tube voltage applied the standard algorithm, metal artifact decreased to 44.9% for 80 vs 120 kVp, 24% for 100 vs 120 kVp, while the image taken at 140 kVp increased the artifact by 19% compared to 120 kVp. When the tube current was increased from 100 to 300 mA, there was no significant difference in the CT value and noise. Black band and white strike artifacts occurred up to 65.9% in the adjacent ROI of the metal driver, whereas titanium screw produced lesser metal artifact than that of the metal driver. The combination of 120kVp or higher tube voltage-standard algorithm was effective in removing black band artifacts as well as white streak by high density materials. However, MAR reconstruction algorithm was useful in improving image quality under the environment of low kVp and high density materials, without increase of radiation exposure.
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