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권덕문,박종삼,박명환,이준일 대구보건대학 1995 대구보건대학 論文集 Vol.15 No.-
This experiment was done in order to give some help for stone doigonosis. After calculating theoretical value and interposition stone at the phantom which set at the same position with human and radiography, we compared both magnification degree and the conclusion is like this. 1. The average distance from dorsal to kidney pelvis is 7.7㎝, to middle ureter is 11. 1㎝ and to ureter bladder jucntion is 9.5㎝. 2. In the case of the same abdomen thickness, the distance error at each part and in personal was ± 5%. 3. Magnification degree at each part of abdomen was shown that it was 1.17 times at kidney plvis, 1.12 times at middle urter and 1.2 times ureter bladder junction.
진단용 X-선 장치에서 조사야조절기구의 성능개선에 대한 연구
권덕문,김성환,유동수,남효덕 대구보건대학 2002 대구보건대학 論文集 Vol.22 No.-
The performance of the X-ray equipment's collimator system was improved by using ultrasound distance indicator and laser unit. The laser beams were coincided with radiation field. The distance between X-ray focus and film could be measured by using the ultrasound distance indicator attached collimator. According to the actual investigation in collimator, 30% of equipments were not satisfied recommendations on standard of illumination intensity, and 25% of them were not satisfied recommendations on limits of light/radiation field coincidence. Therefore by using laser beam coincided with light field the difference between light field and radiation filed could be decreased. By using the ultrasound distance indicator, the distance between focus and film could be measured easily, rapidly and correctly.
X선 촬영인자의 변화에 따른 영상의 주관적인 화질 평가
권덕문,박명환,김성환,박종삼,이준일,남효덕 대구보건대학 2001 대구보건대학 論文集 Vol.21 No.-
In this study, visual recognition of X-ray images were estimated using hawlet charts. The resolution has achieved excellent result when densities of film were 1.0~1.5. The more thickness of object was increase, the more the resolution was decrease, because scattered X-ray were increased. The more distance of object to film was increase, the more the resolution was decrease, because groedel effect. The more focal spot size was increase, the more resolution was decrease, because unsharpness was increase. The more field size was increase and grid ratio was decrease, the more resolution was decrease, because scattered X-ray were increase. As a result, we could to improve image quality by determination of resolution according to Radiography parameters. And, we proved that hawlet charts were useful for estimate of image quality and set up x-ray radiography.
Star Test Pattern을 이용한 X-선관 등가초점의 측정
권덕문,박종삼,이준일,남효덕 대구보건대학 1999 대구보건대학 論文集 Vol.19 No.-
In this study, equivalent focal spot sizes of X-ray tube were measured by star test pattern. As a result, the focal size was proportional to tube current and inversely proportional to tube voltage. Although tube current was increased the focal size was almost constant, when tube voltage is large than 80kVp. And, focal size was more increased at high tube current or low tube voltage. Resolution was more excellent if focal size was small. We confirmed what the radiation energy was distributed as edge band distribution in focus, because the intensity of energy at side was larger than in center.
Slit 이동장치 제작 및 거리변화법에 의한 감도측정과의 비교 검토
박종삼,박명환,권덕문,이준일 대구보건대학 1995 대구보건대학 論文集 Vol.15 No.-
The slit moving apparatus which determine the advantage of opt-sentive material in sensitometry was produced and was compared to the distance scale method which has low variation in accuracy and in reproduction, and the results showed that the unique value agree. The slit moving apparatus is expect to reduce space which needs widely for sensitometry in distance scale method and improve convince to user.
김재문,권덕문,최세곤 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.2
The output characteristics on various rectification methods of X-ray equipments for the purpose of medical use are investigated by means of X-ray multimeter. in comparison the measured values with setting values, the accuracy of X-ray tube voltage and illumination time was varied in the range of +70% in case of three phase type including inverter type. The inverter type also showed a good reproducibility. As the experimental results, it is desirable that the inverter type X-ray equipment will be widely used in the near future.