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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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류명송(Myung-Song Ryu),최남길(Nam-Gil Choi),한재복(Jae-Bok Han),양숙(Sook Yang),이종호(Jong-Ho Lee) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.4
본 연구는 체질량지수에 따른 관전압(㎸p)과 관전류량(㎃s)의 변화에서 선량과 화질의 연관성을 알아보고자 하였다. 실험대상군은 A군(100 ㎸p, 240 ㎃s, N=20), B군(120 ㎸p, 240 ㎃s, N=20), C군(100 ㎸p, 270 ㎃s, N=20), D군(120 ㎸p, 270 ㎃s, N=20)으로 나누어 관전류량의 변화에 관계된 화질을 평가하였다. 실험대상군에 대한 화질평가는 4점 척도를 사용하여 very good 4점, good 3점, fair 2점, poor 1점 등급으로 나누어 평가하였고, 피폭선량은 DLP(dose length product)를 이용하여 평가하였다. 결론적으로 100 ㎸p에서는 5.6 mGy·cm, 120 ㎸p에서는 11 mGy·㎝ 정도 낮은 선량을 보였고 통계적으로 유의한 차이를 보였다(p<0.05). 하지만 화질평가에서도 통계적으로 유의한 차이가 없었으며 진단적 가치가 동등한 영상을 획득하였다(p>0.05). 따라서 CT 관상동맥조영술 검사에서는 사전에 체질량지수(body mass index)을 고려하여 검사조건을 적절하게 선택하는 것이 환자의 피폭선량을 줄이면서 최적의 화질을 획득할 수 있을 것이라 사료된다. The aim of this study was to assess the effect of exposure factors such as ㎸p and mA applied by BMI on the image quality and patients absorbed dose of Coronary angiography in CT. Each data sets were into 4groups with different exposure values : Group A at 100㎸p, 240㎃s, Group B at 120㎸p, 240㎃s, Group C at 100kVp, 270㎃s and Group D at 120㎸p, 270㎃s, and the mean of the scores of 4 groups was calculated for image quality as 4grades that is, 1(poor), 2(fair), 3(good) and 4(very good). Patient absorbed dose was calculated as DLP on the monitor. In case of absorbed dose, deviation in 2groups at 100kVp was 5.6 mGy·cm, 11 mGy·cm was at 120㎸p(DLP) with p<0.05. There was rather difference between groups with 100kVp or 120㎸p respectively but the gaps were very little. No significant correlation was found between exposure factors and image quality in any images assessed(p>0.05), and the image quality was sufficient for diagnosis. As we applying coronary angiography, the selection of adequate exposure factors considering BMI identified might be effective for reduction of patient absorbed dose, improvement of image quality and diagnostic accuracy.
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양숙,김재덕 大韓口腔顎顔面 放射線學會 1993 Imaging Science in Dentistry Vol.23 No.2
The purpose of this study was to find out the prevalence of dental anomalies in 600 normal persons(male:363, female:237) at age 14 to years, through history taking, oral examination, and radiographic observations of subjects. The obtained results were as follows: 1. The prevalences of individual dental anomalies were as follows; Congenitally missing teeth 7%; supernumerary teeth 1.33%; ectopic eruption; 8.50%, transposition;0.33% rotation; 23.67%, microdontia; 11.16%(peg lateralis; 5.33%, third molar; 5.83%), prolonged retention of deciduous teeth; 1.33%, crowding 49.83%, and spacing; 15.17%. 2. Alterations in numbers of teeth : The most frequently missing teeth were mandibular lateral incisors, followed by mandibular second premolars and maxillary second premolars. In numbers of congenitally missing teeth per person, 52.38% had one missing tooth and 30.95% had two missing teeth. In supernumerary teeth, there was higher rate in male than in female. Most supernumerar teeth were mesiodens of median area in maxilla and the eruption pattern of that teeth generally was unerupted state. 3. In transposition, exchange of position of teeth involved the canine and first premolar. 4. Congenital missing rate of permanent successors in prolonged retention of deciduous teeth was 69.23%. 5. Crowing and spacing had respectively higher rate in mandible and in maxilla.
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