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- 저자 : 고유림(Yu-Rim Go) (검색결과 3 건)
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Cobey 검사법과 Modified Cobey 검사법에 대한 방사선학적 연구
고유림(Yu-Rim Go),주영철(Young-Cheol Joo),이승근(Seung-Keun Lee) 대한방사선과학회(구 대한방사선기술학회) 2019 방사선기술과학 Vol.42 No.3
The Cobey method and the modified Cobey method are most commonly used in clinical practice. Therefore, the purpose of this study was to investigate the radiological differences between Cobey and modified Cobey and provide radiographic information about changes of hindfoot image with X-ray entrance center and tube angle change in modified Cobey. This study was performed on foot and ankle phantom. First, for image comparison of Cobey and modified Cobey, the images obtained by applying the same X-ray entrance center to the ankle joint were compared and analyzed. Second, in the modified Cobey, the X-ray entrance center is set as ankle joint and lateral malleolus. The X-ray tube angle was varied from 10° to 40° at 5° intervals for each X-ray entrance center. The images obtained by varying the X-ray tube angle from 10° to 40° at intervals of 5° for each X-ray entrance center were compared and analyzed. The irradiation conditions were the same with 110 kVp, 200 mA, 10 ㎳, and 110 ㎝ of source - image receptor distance (SID). Image evaluation was performed by two radiologists. Measurements were made on the lateral point, middle point, and calcaneus width based on a hypothetical line parallel to the calcaneal tuberosity. Data were analyzed by using descriptive statistics as the mean of the distance to each measurement location. The modified Cobey was longer than the Cobey by an average of 3 to 4 mm lateral and medial points, and the calcaneus width was similar (ICC = 0.939). In modified Cobey method, when the X-ray entrance center is ankle joint, the lateral point is about 3 ㎜ and the medial point is about 4.3㎜ longer than lateral malleolus. Also, when the X-ray tube angle is more than 20°, the degree of distortion is large. The ICCs for the lateral, medial point, and calcaneus width were 0.998, 0.961, and 0.997, respectively, as the X-ray entrance center and tube angle were changed. There was no significant difference between Modified Cobey and Cobey. Modified Cobey showed no need to compensate the 20° detector angle of the Cobey. In addition, we suggest that tube angle should be limited within 20° when modified Cobey is performed.
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진단용 엑스선 발생장치에서 부가 여과판에 따른 선량과 화질 비교
이현경(Hyun-Kyung Lee),고유림(Yu-Rim Go),박영경(Young-Kyeong Park),한동균(Dong-Kyoon Han) 한국방사선학회 2017 한국방사선학회 논문지 Vol.11 No.6
본 연구는 부가 여과판의 재질로 구리와 니켈을 선정하여 각 물질에 따라 선량과 화질의 차이를 비교 평가하였다. 먼저, 선량에 대한 실험은 흡수선량 측정으로 란도 팬텀을 이용하여 구리 및 니켈의 부가 여과판을 None, 0.1 mm, 0.2 mm, 0.3 mm로 변화시켜 설치하고 120 kVp, 6.3 mAs의 조건으로 조사하였다. 두 번째 로, 관전압 변화와 노출지수 변화에 따라 부가 여과판 두께별로 얻은 영상을 Image J 프로그램을 이용하여 SNR과 CNR값을 구하여 영상을 평가 하였다. 흡수선량 측정은 니켈이 구리보다 높게 나왔으며, 두께가 증가할수록 흡수선량은 감소하였다(p〈0.05). 관전압이 증가와 노출지수 변화에 대해서도 두 영상에서 유의한 차이를 보이지 않았다(p〉0.05). 결론적으로 본 연구는 부가 여과판에서 니켈은 기존의 구리에 비해 피폭선 량을 감소하면서도 현재의 영상의 질을 유지할 수 있는 물질임을 알 수 있다. The purpose of this study was to evaluate the difference of dose and image quality according to the material of the additional filter plate by selecting copper and nickel. First, the absorbed dose was measured using a Rando phantom setting the additional filter plates of copper and nickel None, 0.1 mm, 0.2 mm, and 0.3 mm under 120 kVp, and 6.3 mAs. Second, We acquired image according to filter thickness of copper and nickel. by changing the tube voltage of 90 kVp, 100 kVp, 110 kVp, 120 kVp and exposure indexes of 400, 800 and 1600. Third, we obtained the SNR and CNR values using the Image J program and evaluated quantitatively and then evaluated image quality. As a result, Absorbed dose measurements showed that nickel was higher than copper, and the absorbed dose decreased as the thickness increased(p〈0.05). Furthermore, Quantitative analysis of images showed no significant difference between the two images according to change the voltage and the exposure index(p〉0.05). In conclusion, this study confirms that the nickel addition plate can maintain the current image quality while reducing the exposure dose compared to copper.
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Merchant 검사 시 슬개대퇴관절 겹침 최소화를 위한 중심 X선 입사각에 대한 평가
고예원(Ko Ye-Weon),주영철(Joo Young-Cheol),김민석(Kim Min-suk),고유림(Go Yu-Rim) 대한방사선과학회(구 대한방사선기술학회) 2020 방사선기술과학 Vol.43 No.3
This study aimed to found out the effect of patellofemoral overlap distance by changing femur thickness and center X-ray angles in Merchant method images. Based on the femur thickness, it suggested tube angle minimizes overlap. It was conducted by Merchant method, a knee tangential view, and the image was obtained by changing the thigh thickness from 14 to 20 ㎝ and the center ray angle from 60°, 57°, 55°. The images were measured by five researchers using a method of measuring the overlap, which was designed by them. The results showed at 60°, 57°, 55° angle, the patellofemoral overlap distance resulted in 0.47±0.66 to 20.89±0.65 ㎝, 2.26±0.28 to 15.73±0.62 ㎝, 1.39 ± 0.83 to 12.49 ± 0.37 ㎝. However, for 57° and 55°, no overlap in thickness under 14.5 and 14 to 15.5 didn t appear. it showed high correlation between femur thickness and overlap. The difference in the mean value of overlap in each group showed a statistically significant difference (p<0.01), all were classified as independent groups in the post-hoc test. In all images, the patellofemoral overlap distance increased as the thickness increased, and at the average thickness of Korean men and women, overlap decreased when reducing center ray. When conducting Merchant tests on Koreans, it was suggested it would be useful to use 57° angle because it minimize the effects of overlap and intrusions of tibia.
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