웹 상에서 DICOM 변환기를 이용한 MINI-PACS 설계 및 구현

지연상,이강현,정일용,이성주,Ji, Youn-Sang,Rhee, Kang-Hyeon,Chung, Il-Yong,Lee, Sung-Joo 대한전자공학회 2001 電子工學會論文誌-CI (Computer and Information) Vol.38 No.4

병원 내의 정보시스템의 도입은 업무운영 효율의 혁신적인 향상을 가져 올 수 있으며 운영 경비의 절감과 환자에 대한 양질의 서비스를 제공한다. X-ray필름을 포함한 의료 영상 정보를 효율적으로 관리하는 PACS는 현대화된 병원 정보 시스템에 있어서 필수적인 구성요소로 등장하고 있다. PACS 시스템은 각종 장비에서 서로 다른 형태의 영상 정보를 표준 의료 영상 파일 형식으로 표준화시켜 네트워크로 연결시켜 주어야한다. 본 논문에서는 이를 해결하기 위해서 DICOM 컨버터를 설계하여 Non-DICOM 파일 형식을 표준화된 파일 형식으로 변환시켜 주는 Mini-PACS를 설계하였다. 이 시스템은 웹 기반에서 운영되고 있으며, 클라이언트 모듈과 서버모듈인 두개의 서버로 운영되고 있는 기존의 시스템과 달리 두개의 서버 기능을 하나로 통합하여 시스템 상호간의 강력한 결합을 이룰 수 있도록 설계 및 구현하였다. Application of information system to hospital would bring innovative improvement on efficiency of business management and provide high quality services toward patients as well as the retrenchment of operating funds. PACS(Picture Archiving and Communication System) including X-ray film that manages the medical image information effectively, has drawn considerable attention to essential structural elements to the sophisticated information system for hospital. PACS system should be connected to the network after making a form of standard medical image file from different style of image information obtained from various medical instruments. In this paper, to solve this problem, we construct Mini-PACS that converts the form of Non-DICOM file to the form of standard file by designing the DICOM converter. This system is designed to be managed under Web environment. Comparing with the existed Mini-PACSs, consisting of the client and server module, our system is designed and implemented with integration of these functions in order to be strongly combine strongly between system.

6 MV Linac을 이용한 Symmetric field와 Asymmetric field에서 Wedge factor의 비교 고찰

지연상,한재진,Ji, Youn-Sang,Han, Jae-Jin 대한방사선기술학회 1999 방사선기술과학 Vol.22 No.2

Therapy equipment have taken progress for Cancer make use of Radiation for the normal tissue system make much of important for shielding. In modern times independent jaw setting to used equipment as possible make use of asymmetric field. Therefore, the asymmetric field be leave out of consideration wedge factor because of with used wedge for the most of part. These experimentation find out have an effect on the dosimetry of out put compared with of the difference between the symmetric field and asymmetic field for the wedge factor.

방사선과 촬영 실습실에서의 피폭선량 저감대책에 관한 연구

지연상 ( Youn Sang Ji ),김창복 ( Chang Bok Kim ),박용순 ( Yong Soon Park ),동경래 ( Kyung Rae Dong ),정재은 ( Jae Eun Jung ) 조선대학교 공학기술연구원 2012 공학기술논문지 Vol.5 No.1

This study serves as the overall controlling aim of radiation safety for the students in the department of radiology. An X-ray radiation is a form of ionization radiation that is potentially very hazardous. Thus, it is very important to be careful when using an X- ray instrument. In comparison of the radiation dose in Digital radiography (DR), Computer radiography (CR) and General radiography (GR) rooms, the radiation dose was higher in the order of DR, CR and GR rooms. Also, the distance from a radiation generator, the size of a room, the opening or closing of a door and change of the exposure radiation dose are the important factors that could be dangerous. Therefore, for the protection shielding apron should be used. This practice is strongly recommended for the students.

발목 관절 방사선조사의 환자체중과 각도와 상관관계 연구

지연상 ( Youn Sang Ji ),김창복 ( Chang Bok Kim ),박용순 ( Yong Soon Park ),동경래 ( Kyung Rae Dong ),정재은 ( Jae Eun Jung ) 조선대학교 공학기술연구원 2012 공학기술논문지 Vol.5 No.1

In our body ankle joint is injured due to sports, trauma and sprain, so accurate images are necessary to examine the malleolar articular surface, the internal part of ankle and calcaneal joints. Ankle study is performed usually by using Mortis View taking at 10°, 15°, 20° and 25° during oblique projection. The ankle joint cavity of underweight and normal weight patients was observed to b opened well average at 20° and that of overweight was done at 25°. Because, a slight change of angle cavity from 10 to 25° could cause the angle injury. However, angle position could be maintained easily by using an immobilization de ice. Therefore, body weight is a critical factor in the change of angle and an immobilization device is considered useful for the assessment of angle joint images.

유방촬영시 관찰조건에 따른 임상영상평가

김미현,김창복,지연상,동경래,Kim, Mi-Hyun,Kim, Chang-Bok,Ji, Youn-Sang,Dong, Kyung-Rae 대한디지털의료영상학회 2010 대한디지털의료영상학회논문지 Vol.12 No.2

High contrast and high resolution are the most important factors for examining mammography images. Despite of the inconveniences of screen-film, most clinics still prefer them to computed radiography(CR) and direct radiography(DR). The reading of screen-film mammography images is influenced by the brightness from the X-ray illuminator, the exam room and incoming light from outside sources. Therefore, a comparative analysis on the results of mammo phantom images would be variated by the changes in the reading environment. There was no influence on reading results from the examiners close distance eyesight(p > 0.05); however, reading of micro lesions improved with greater darkness in the X-ray film reading room and the brightness of the X-ray illuminator(p < 0.05). Also, observation of fiber and mass images were maximized at a distance of 50 cm from the reader. Now, it is possible to observe these small classification groups using a magnifying glass without being physically close to the image. For the image of mammography, obtaining high quality images is important but in order to get an accurate clinical lesions of the reading also needs to be considered the optimal environmental factors.

흉부 촬영시 심음영 확대에 따른 유용성에 관한 연구

박은경,이건영,정용태,동경래,지연상,Park, Eun-Gyung,Lee, Kun-Young,Jung, Young-Tae,Dong, Kyung-Rae,Ji, Youn-Sang 대한디지털의료영상학회 2010 대한디지털의료영상학회논문지 Vol.12 No.2

In order to demonstrate the value of long-distance radiography, we have studied how distance affects images in chest frontal radiography and compared short-distance and long-distance images in chest lateral radiography. Cardiothoracic ratio(CTR %) of 50 patients with no disease in the chest(10 each at the age of 20~60) were evaluated in Supine AP(100 cm), Sitting AP(100 cm), Sitting AP(180 cm), and Erect PA(180 cm). In lateral radiography, we evaluated and compared left lateral radiography(100 cm and 180 cm) of the patients based on the horizontal maximum of the heart. The average value of CTR(%) were 0.48 in Erect PA(180 cm), 0.52 in Supine AP(100 cm), 0.50 in Sitting AP(100 cm), 0.49 in Sitting AP(180 cm), which were Supine AP(100 cm) > Sitting AP(100 cm) > Sitting AP(180 cm) > Erect PA(180 cm). The average value of Maximum transverse diameter of left of the cardiac(MLD), which showed how much axis of spine was slanted to the left, was 90.67 mm in Erect PA(180 cm), 103.92 mm in Supine AP(100 cm), 93.54 mm in Sitting(100 cm), 89.84 mm in Sitting AP(180 cm), 58.11 mm in the minimum value and 118.79 mm in the maximum value. The average value of Maximum transverse diameter of right side of the cardiac(MRD), which suggested how much axis of spine was slanted to the right, was 47.18 mm in Erect PA(180 cm), 48.12 mm in Supine AP(100 cm), 44.98 mm in Sitting AP(180 cm), and the minimum value 26.84 mm and the maximum value 65.30 mm. There was no standard method to calculate; therefore, the horizontal maximum of the heart was used for lateral radiography. The average value was 121.07 mm in 100 cm and 109.76 mm in 180 cm. Sitting AP(180 cm) among the types was closest to C-PA(180 cm). As a result, during C-AP radiography, long-distance radiography lessened shadow of the heart more than that of short distance, Sitting position more than Supine position.

The Study on the Attenuation of X-ray and Imaging Quality by Contents in Stomach

Kyung-Rae Dong(동경래) · Youn-Sang Ji(지연상) · Chang-Bok Kim(김창복) · Seong-Kwan Choi(최성관) · Sang-In Moon(문상인) · Kevin Dieter(디터 케빈) 대한방사선과학회(구 대한방사선기술학회) 2009 방사선기술과학 Vol.32 No.1

인체의 40~50%인 연부조직에 X선을 조사하면 연부조직의 두께에 따라 투과선량이 감소하며 영상에도 질적 저하를 가져온다. 본 연구는 복부 촬영시 위장내 내용물에 따라 X선 감약 및 화질에 차이가 나타날 수 있다는 가정 하에 실제 위의 조직과 비슷한 조직등가물질 phantom을 제작하여 실제 위장내 내용물에 따른 X선의 감약 변화와 DR (Digital Ridiography)의 ROI수치를 비교해보았다. 단백질 두께가 증가할수록 X-선 감약에 의한 투과선량이 감소되었으며(p < 0.001), Film과 DR 영상에서의 ROI Mean값의 변화도 감소하였다(p < 0.001). Film과 DR 영상에서의 ROI Mean값에 대한 비교는 Film이 DR 영상에 비해 단백질 두께에 따른 농도의 변화 값이 크게 나타났다(p < 0.001). 이와 같은 결과를 종합해 볼 때 DR system 촬영 보다는 필름을 사용하는 단순촬영에서 금식(NPO ; nothing by mouth)의 필요성이 더 중요함을 알 수 있다. This study examined the change in the attenuation of X-rays with the ROI (Region of Interest) in DR (Digital Radiography) according to the stomach contents by manufacturing a tissue equivalent material phantom to simulate real stomach tissue based on the assumption that there is some attenuation of X-rays and a difference in imaging quality according to the stomach contents. The transit dosage by the attenuation of X-rays decreased with increasing protein thickness, which altered the average ROI values in the film and DR images. A comparison of the change in average ROI values of the film and DR image showed that the image in film caused larger density changes with varying thickness of protein than the image by DR. The results indicate that NPO (nothing by mouth) is more important in film system than in DR system.

Radiation-Induced IL(interleukin)-6 in Mice with Algin-Oligosaccharide Treatment

Seong-Kwan Choi(최성관),Youn-Sang Ji(지연상) 대한방사선과학회(구 대한방사선기술학회) 2010 방사선기술과학 Vol.33 No.4

본 연구에서는 미역이나 다시마에 많이 분포하면서 항산화작용이 탁월한 알긴산올리고당의 방사선 방어효과를 알아보기 위해 3 Gy 방사선이 전신 1회 조사된 마우스를 가지고 IL-6을 측정하였다. 측정 결과 방사선조사대조군과 비교하여 볼 때 소장과 간 조직 모두 방사선조사 전 7일간 알긴산올리고당의 처치를 시행한 그룹에서 IL-6 생성이 억제됨을 관찰하였다(p < 0.001). 이는 알긴산올리고당이 항산화작용을 통해 방사선이 피폭된 생체조직을 방어함으로써 IL-6의 생성을 억제한 것으로 사료된다. 결론적으로, 본 연구를 통해 알긴산올리고당의 일부 방사선 방어효과를 규명했고 아울러 화학적 독성이 없는 자연산생물이 방사선 방어제로 활용될 수 있을 가능성을 확인하였다. To examine the radioprotective effect of algin-oligosaccharide(AOS), radiation-induced IL(interleukin)-6 in mice treated with 3 Gy whole body irradiation once were examined. In the measurement of irradiation-induced IL-6, in comparison with the irradiation control group, in both small intestine and liver tissues of the group treated with algin-oligosaccharide for 7 days prior to irradiation, was suppressed IL-6 synthesis(p < 0.001). It is considered that the protection against radiation hazard by antioxydative reaction of algin oligosaccharide results in down control of IL-6 value in experimental groups treated with algin-oligosaccharide. In conclusion, through our study, the fact that algin-oligosaccharide has irradiation protection effects was elucidated, and simultaneously, the possibility of the use of a natural product without chemical toxicity as an irradiation protection agent was confirmed.

폐 조직 등가물질을 이용한 감약정도 측정에 관한 고찰

동경래 ( Kyung Rae Dong ),김창복 ( Chang Bok Kim ),지연상 ( Youn Sang Ji ),김기연 ( Ki Youn Kim ),정운관 ( Woon Kwan Chung ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.2

It is important to measure the radiation dose of the heterogenous tissue in the radiogenic diagnosis and treatment. There are different absorption coefficient in oft and fatty tissue, bone, and tissue including water. They have the difference of the radiation in X-ray. We check the attenuation by changing the thickness and using the equivalent quality in the tissue. we used the acrylic, millet, and cork that have similar density to soft tissue, fatty, lung tissue for the attenuation of the each tissue. The results showed that acrylic measured 16 cm, 18 cm, and cork 47 cm. That is to say, the volume of the penetrating radiation was larger in following order, Cork, Millet, and then Acrylic. when we apply the real thickness of the soft, fatty, and lung tissue to the equivalent quality, the attenuation were 37% per 1 cm in the Acrylic, 34% in the Millet, and 63% in the Cork. We compared the atteunation between phantom made from equivalent quality and human chest. The attenuation in the chest PA was 9.33 mAs, and in the phantom was 9.43 mAs. Therefore, We can confirm the utility of the phantom to measure the dose of the penetrating radiation for the small difference about 0.1 mAs between phantom and human tissue.