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진단용 엑스선 장치에 있어서 방사선 방어에 대한 일반 요구사항 -IEC 60601-1-3:2008에 근거한 KFDA DRS 1-1-3:2008-
강희두,동경래,권대철,최준구,정재호,정재은,류영환,Kang, Hee-Doo,Dong, Kyung-Rae,Kweon, Dae-Cheol,Choi, Jun-Gu,Jeong, Jae-Ho,Jung, Jae-Eun,Ryu, Young-Hwan 대한디지털의료영상학회 2009 대한디지털의료영상학회논문지 Vol.11 No.2
This study gives an account of the collateral standards in IEC 60601-1-3: 2008 specifying the general requirements for basic safety and essential performance of diagnostic X-ray equipment regarding radiation protection as it pertains to the production of X-rays. The collateral standards establish general requirements for safety regarding ionization radiation in diagnostic radiation systems and describe a verifiable evaluation method of suitable requirements regarding control over the lowest possible dose equivalent for patients, radiologic technologists, and others. The particular standards for each equipment can be determined by the general requirements in the collateral standard and the particular standard is followed in the risk management file. The guidelines for radiation safety of diagnostic radiation systems is written up in ISO 13485, ISO 14971, IEC 60601-1-3(2002)1st edition, medical electric equipment part 1-3, and the general requirements for safety-collateral standards: programmable electrical medical systems. Therefore the diagnostic radiation system protects citizens' health rights with the establishment and revisions of laws and standards for diagnostic radiation systems as a background for the general requirements of radiation safe guards applies, as an international trend, standards regarding the medical radiation safety management. The diagnostic radiation system will also assure competitive power through a conforming evaluation unifying the differing standards, technical specifications, and recognized processes.
경희의료원 PACS 운영관리를 위한 외주관리와 제안요청 연구
강희두,정재호,손기경,성동욱,Kang, H.D.,Jung, J.H.,Son, G.G.,Seong, D.U. 대한디지털의료영상학회 2007 대한디지털의료영상학회논문지 Vol.9 No.1
PACS 유지보수 서비스의 중요성을 살펴보고 PACS 분분별 제안요청 요소를 분석하여 향후 시스템 유지보수 계약의 지표를 제공하는데 목적이 있으며 경희의료원의 PACS 유지보수 제안서요청의 사례를 중심으로 유지보수 RFP 작성의 필요성, 중요사항 및 분야별 요구사항 등에 대하여 기술한다. 제안 부문은 9 개로 구분하였으며 총 139 항목의 제안 요청 사항을 정리하였다. 제안 요소 연구의 결과는 다음과 같다. 1. PACS 유지보수 분야는 PACS Software 부문, 데이터베이스 부문, 서버 및 스토리지 부문, 네트워크 부문, CR 및 DR System 등과 같은 영상획득장치에 관한 부문, 판독용 및 임상용 모니터 부문 등으로 구분하며, 각 부문별 제안 요구사항을 기술한 제안요청서를 작성하여 각 부문별 제안서를 요청하여야 한다. 2. 병원에서는 PACS 부문의 외주관리를 체계적으로 구분 관리하여 시스템 유지보수의 수준을 높이고 이를 질 높은 의료서비스로 연계되도록 하여야 한다. 3. PACS 관련 회사는 병원에서 요청된 제안 요청사항을 수용하며 질 높은 관련부문 서비스를 제공하기위한 기술적 배경을 체계화하여야하며 향후 주요 매출원으로 자리 잡게 될 유지보수 서비스를 상품으로 인식하고 이에 대한 적극적인 상품화전략과 홍보 노력이 필요하다.
정재호,정재은,강희두,나극환,Jung, Jae-Ho,Jung, Jae-Eun,Kang, Hee-Doo,Ra, Keuk-Hwan 대한디지털의료영상학회 2009 대한디지털의료영상학회논문지 Vol.11 No.2
Carried out an experiment for quantitative evaluation about intraoral sensor among oral dental imaging equipments in PACS environment. For evaluation, testing environment & evaluation criteria are established that refer to the 'IEC 62220-1-2' and experimented with set up the standard radiation penetration that correspond with RQA-3(IEC 61267). Results of experiments using the image J, derived the ESF(edge spread function), LSF (line spread function) and calculated the MTF(modulation transfer function) finally. As a result, the MTF that 0.1, 0.2sec are 10% about 10 lp/mm and 0.32 sec is the 10% about 9 lp/mm in level represents the value of the MTF. Change of scan condition in dental environmental, according to the MTF value taken note that no changes can be seen enough. However, the dimensions of each other size $1(1200{\times}1600)$, size $2(1440{\times}1920)$ intraoral sensors for 3 lp/mm, respectively 40%, 90% of the note might have been the difference between the value of MTF, in accordance with standard sensors might note differences could be observed.
김정민,김유현,강희두 高麗大學校 倂設 保健大學 保健科學硏究所 2000 保健科學論集 Vol.26 No.1
This study explored three sectors that one should know when he or she wants to use the PACS system. First, image acquisition, image saving and the quality of image output; Secondly, server and network; Thirdly, how to manage image saving and data base. The results were as follows; 1. Image Quality of PACS System 1) Image quality in the stage of image acquisition is affected by bit depth and matrix size. 2) Image quality in the stage of image saving is influenced by a compressed rate. Medical images are based n a principle of 2:1 non loss compress. 3) Image quality in the stage of image output is affected by monitor quality(brightness and the number of scanning line) 2. Server and Network 1) The use of server is different according to hospitals' scale. Clustering technique is used for main computer's DB because of system's stability. Doubling technique of power supply is also used. Ga-chun hospital and Baik hospital located in ll-san use Windows NT for the operating system of the server and other hospitals use UNIX. 2) ATM and Fast Ethenet is used for the Network that can transmit large data faster. In the case of hospitals that have PACS used the Network over 100 Mbps. There were two types of network construction-single network and double network. 3. Data saving and DB. 1) When choosing a saving media of PACS, speed and reliability and price are considered important categories. For short-term, RAID process is formed using HDD and long term Optical Juke Box is mainly used. 2) Oracle that is useful for large data management is used. 3) In the near future, HDD is going to be mainly used regardless of the short term or long term saving media and practical application of RAM Disk will increase.
정재은,정재호,강희두,이종웅,나극환,Jung, Jae-Eun,Jung, Jae-Ho,Kang, Hee-Doo,Lee, Jong-Woong,Ra, Keuk-Hwan 대한디지털의료영상학회 2009 대한디지털의료영상학회논문지 Vol.11 No.2
I think this will be valuable reference for assuring consistency and homogeneity of clarity and managing dental radiation equipment by experimentation of dental radiation equipment permanent which based on KS C IEC 61223-3-4 standard and KS C IEC 61223-2-7. Put a dental radiation generator and experiment equipment as source and film(sensor) length within 30 em, place the step-wedge above the film(sensor). Tie up tube voltage 60 kVp, tube current 7 mA and then get an each image through CCD sensor and film by changing the exposure time as 0.12sec, 0.25sec, 0.4sec. Repeat the test 5times as a same method. Measure the concentration of each stage of film image, which gained by experiment, using photometer. And the image that gained by CCD sensor, analyze the pixel value's change by using image J, which is analyzing image program provided by NIH(National Institutes of Health). In case of film, while 0.12sec and 0.25sec show regular rising pattern of density gap as exposure time's increase, 0.4sec shows low rather than 0.12sec and 0.25sec. In case of CCD sensor density test, the result shows opposite pattern of film. This makes me think that pixels of CCD's sensor can have 0~255 value but it becomes saturation if the value is over 255. The way that getting clear reception during decreasing human's exposed radiation is one of maintaining an equipment as a best condition. So we should keeping a dental radiation equipment's condition steadily through cyclic permanent test after factor examination. Even digital equipment doesn't maintain a permanent, it can maintain a clarity by post processing of image so that hard to set it as standard of permanent test. Therefore it would be more increase the accuracy that compare a film as standard image. Thus I consider it will be an important measurement to care for dental radiation equipment and warrant homogeneity, consistency of dental image's clarity through comparing pattern which is the result from factor test against cyclic permanent test.