Contrast-Detail Phantom을 이용한 CR에서 Image Plate의 사용 횟수에 따른 Contrast-Detail Curve의 변화

이승철,박장흠,김재동,박창현,Lee, Seung-Cheol,Park, Jang-Heum,Kim, Jae-Dong,Park, Chang-Hyeon 대한디지털의료영상학회 2005 대한디지털의료영상학회논문지 Vol.7 No.1

Purpose : Image plate (IP) is substituted for film in computed radiography. This study is to investigate into a variation of contrast and detail by the number used of image plate in computed radiography. Materials and Methods : A Contrast-Detail(CD)-RAD 2.0 phantom(Nijmegen hospital, The Netherlands) was used for this study. The computed radiography(CR) CD-RAD phantom images were acquired at 40 kVp, 160 mA, 1.6 mAs, and small focus with the Shimadzu general radiography UD-150B-10 system and Fuji FCR 5000 image process system with speed of 200. The IP used including once, 5000 times, and 10000 times also was used. The numerical value of image quality figures (IQF) was produced by CD-RAD analyser(the program is installed in the directory), and then contrast-detail curve was drawn. Results : In this study, the value of IQF was 3.53 in IP used once, 3.40 in 5000 times, and 3.22 in 10000 times. Conclusions : There was a variation of contrast-detail curve by the number used of IP with contrast-detail phantom in computed radiography. Therefore, it is necessary that the IP with lower IQF and a shift of contrast-detail curve to the lower left part is used.

전 척추 전.후 방향 검사 시 AEC Mode와 Fix Mode에서 PC-Based Monte Carlo Program을 이용한 장기선량 및 유효선량 평가

김정진,장성원,박장흠,이관섭,하동윤,Kim, Jeong Jin,Jang, Seong Won,Park, Jang Heum,Lee, Kwan Seob,Ha, Dong Yoon 대한디지털의료영상학회 2012 대한디지털의료영상학회논문지 Vol.14 No.2

There are AEC mode and fix mode to exposure when the whole spine antero-posterior radiography is done by using DR equipment. This study compared the utility of fix mode to AEC mode, by evaluating organ dose and effective dose and by examining the quality of radiographic image. GE DEFINIUM 8000 and ART-200X Rando Phantom manufactured by Flukebiometical were used for this study. The Rando phantom was set in front of wall detector of X-rays equipment. AEC mode was set at 80kVp and Fix mode was set at 80kVp, 25mAs, 32mAs, 40mAs, and 50mAs. Whole spine AP image were aquired by combining C, T-L and L-S spine images obtained through 3 exposures. When obtaining C, T-L and L-S spine images, were checked for Air kerma (mGy) value calculated by UNFORS Xi meter attached at the phantom surface of center of radiation field. The effective and organ doses were compared by PCXMC program (PC-Based Monte Carlo Program). The quality of obtained radiographic image was evaluated visually by 3 radiologists using resolution chart. When the effective doses was calculated based on tissue weighting factor of ICRP-103, 1.278mSv was measured by AEC mode, and Fix mode measured 0.405mSv at 25mAs, 0.518mSv at 32mAs, 0.649mSv at 40mAs, and 0.810mSv at 50mAS. In addition, the organ dose measured with esposure at 25mAs by Fix mode was almost equivalent to the organ dose by AEC mode, at the esophagus, thyroid, oral mucosa, salivaly glands located at the cervical spine part, while the organ dose by Fix mode was in general lower than the organ dose by AEC mode at the other organs. When Fix mode at 32mAs, 40mAs, and 50mAs was compared to AEC mode for organ dose in 26 organs, AEC mode had higher measurement in 21 organs but not for than brain, trachea, thyroid, oral mucosa, and salivaly glands which are located at the cervical spine part. The image quality evaluated by resolution test chart was much higher with AEC mode than the quality with Fix mode at all exposure conditions. However, while the image quality of cervical spine exposured at 50mAs by Fix mode was lower than the quality of AEC mode, thoraco-lumbar spine and lumbo-sacral spine were calculated and the quality was similar to AEC mode. Scoliosis occurs mainly at thoraco-lumbar and lumbo-sacral spine, not at cervical spine. Compared to AEC mode, Using the appropriate protocol (80kVp, 50mAs) of fix mode for whole spine AP radiography was thought to be useful because the image quality of the thoraco-lumar and lumbo-sacral spine was similar on AEC mode, Also organ and effective doses can be decreased with Fix mode. Therefore, It is considered that fix mode can be used properly with AEC mode for whole spine AP radiography when considering patient's body posture.

방사선 피폭에 대한 의료진의 인식도 조사: Mobile X-선 접점부서 대상으로

이양섭(Yang-Sub Lee),김성진(Seong-Jin Kim),우봉철(Bong-Cheol Woo),박장흠(Jang-Heum Park),송인욱(In-Wook Song),장동수(Dong-Soo Chang),이관섭(Kwan-Sup Lee),이미화(Mi-Hwa Lee) 대한영상의학기술학회 2012 대한영상의학기술학회 논문지 Vol.2012 No.-

Purpose: The medical staff of the radiation exposure awareness about analyzes the factors that affect for excessive psychological anxiety and just a ploy to get proper recognition for radiation, and produced promotional material for the radiation exposure is also recognized for improvement and training, should we wish to using of as the basis for it. Materials and Methods: Mobile x-ray inspection of contacts at the intensive care unit(ICU), operating room(OR), emergency room(ER), Ward s medical team for 2 occasions questionnaire survey through. Promotional material in order to learn to read before and after the second round of the survey respondents of cognitive maps of the promotional material for only 106 read medical staff. From March until October 2011, Mobile X-ray dose related data collection, questionnaire creation, radiation dose capacity measurement, promotional materials and public relations, said a poll. The questionnaires consisted of six item on the general characteristics, recognition of radiation dose, radiation exposure state and dose management status, to the knowledge of radiation dose, protection and education of radiation dose, radiation safety management situation and status. Some questions were graded on a five point Likert scal. The average and standard deviation were calculated. Results: Primary survey for men and women respectively 27 and 241 persons and in the second survey, males and women respectively 3 and 103 persons. The business-specific distribution Wards(126), OR(115), ICU(103), ER(30). The common attribute is gender, occupations, in career, there was significant difference. Radiation dose awareness also worked to improve the PR later (p<0.05). Radiation exposure and strengthens the dose after promoting the management situation is found (p>0.05). Of protection and education and increased after seeing promotional material (p>0.05). Radiation safety management situation and increase your status after you promote the safety management are strengthened (p>0.05). Business in the operating room by radiation also recognize most, ER>Wards>ICU showed up in the order. Job experience in radiation dose awareness also showed high annual increases and unmarried women. Conclusion: Overall promotional materials because of the perception of radiation bomb and mind in the knowledge that help show the difference, promotional material through the passing of knowledge worked but did not improve the situation. Due to the lack of basic knowledge about radiation, habitual defensive actions, data deficient, the lack of interest, and promote. Therefore, hospital-wide content development and radiation for systemic education for and defense of and publicity needs to be strengthened. 목적: 의료진들의 방사선 피폭에 대한 인지도에 영향을 미치는 요인을 분석하여 방사선 피폭에 대한 과도한 심리적 불안을 해소시키고 방사선에 대한 올바른 인식을 갖도록 하기 위하여 피폭선량에 대한 홍보자료를 제작하여 방사선에 대한 인식도 개선과 교육을 위한 기초 자료로 활용하고자 하였다. 대상 및 방법: Mobile X-선 검사의 접점 부서인 중환자실, 수술실, 응급실, 병동의 의료진을 대상으로 2차에 걸쳐 설문 조사하였다. 홍보자료를 읽기 전과 후에 인식도 변화를 알아 보기 위해 2차 설문지 응답자 중 홍보자료를 읽어본 의료진 106명(42.6%)만을 대상자로 하였다. 2011년 3월부터 10월까지 X-선 피폭 관련 자료수집 및 설문지 제작, 피폭선량 측정, 홍보자료 제작 및 홍보를 하였다. 설문지는 응답자와 관련된 일반적인 특성, 방사선 피폭에 대한 인식도, 방사선의 노출 정도와 피폭관리 실태, 방사선 피폭에 대한 지식, 방사선 피폭의 예방과 교육, 방사선 안전관리 실태 및 현황 등 총 6개 항목으로 구성하였다. 결과: 1차 설문조사 대상자는 남성 27명, 여성 241명, 2차 설문조사에는 남성 3명(2.8%), 여성 103명(97.2%) 이었다. 근무지별 분포는 병동 126명(33.69%), 수술실 115명(30.75%), 중환자실 103명(27.54%), 응급실 30명(8.02%) 순이었다. 대상자의 일반적 특성은 성별, 직종, 연차에서 유의한 차이가 있었다. 방사선 피폭에 대한 인식도는 홍보 후에 개선효과가 있었다(p<0.05). 방사선의 노출 정도와 피폭관리 실태는 홍보 후에 강화하는 것으로 나타났 다(p>0.05). 방사선 피폭에 대한 지식은 홍보자료를 본 후에 증가하였다(p<0.05). 방사선 피폭의 예방과 교육은 홍보자료를 본 후에 증가하였다(p>0.05). 방사선 안전관리 실태 및현황은 홍보 후에 증가하여 안전관리를 강화하는 것으로 나타났다(p>0.05). 근무지에 따른 방사선 인식도는 수술실에서 가장 높았고, 응급실>병동>중환자실 순으로 낮게 나타났다. 업무경력에 따른 방사선 피폭에 대한 인식도는 연차가 증가할수록 높게 나타났다. 방사선 피폭에 대한 전반적인 인식도는 미혼일수록 예민하였다. 결론: 전반적으로 홍보자료로 인하여 방사선 피폭에 대한 인식도와 지식에서 유의한 차이가 있는 것으로 나타났고, 홍보자료를 통한 지식의 전달은 효과가 있었지만 실태는 개선되지 않았다. 원인은 의료진의 방사선에 대한 기본적인 지식과 자료의 부족, 습관적인 방어적 행동, 불충분한 홍보 기간, 관심의 부족으로 사료된다. 결론적으로 방사선 피폭에 대한 막연한 두려움과 공포를 줄이기 위해서는 병원차원에서 콘텐츠를 개발하여 방사선의 위해와 방어에 대한 체계적인 교육을 통한 지식과 정보 제공 및 홍보를 강화해야 한다고 생각한다.