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.

복부 X선촬영에서의 결석의 확대율 검토

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.

X선 및 감마선에 대한 apron의 차폐율 측정

박명환(Myeong-Hwan Park),권덕문(Deok-Moon Kwon) 대한방사선과학회(구 대한방사선기술학회) 2007 방사선기술과학 Vol.30 No.3

  진단용 방사선발생장치에서의 X선 에너지와 <SUP>99m</SUP>Tc-MDP, <SUP>18</SUP>F-FDG의 감마선 에너지 대한 apron 0.25, 0.5mmPb에 대한 차폐율을 측정하였다. X선 에너지는 관전압 40~120kVp 범위 내에서 부가여과판 0, 2mmAl을 사용한 경우에 실효에너지가 26.2~45.6keV로 측정되었으며, 이때 apron 0.5mmPb은 0.25mmPb보다 최대 선질에서 5.5% 정도 차폐율이 증가하였다. 또한 두 종류의 apron은 직접선과 공간선량률에 대하여 90% 이상의 높은 차폐율을 나타내었다. 그리고 <SUP>99m</SUP>Tc-MDP의 140keV에서 0.25, 0.5mmPb apron을 사용할 경우 30~53% 정도의 차폐효과가 있었으며, <SUP>18</SUP>F-FDG의 511keV의 높은 에너지에서는 1.3~3.6%로 apron의 차폐효과가 매우 적었다.   This research measured the shielding rates of apron 0.25 and 0.5mmPb for X-ray energy in diagnosis radiation system and gamma-ray energy of <SUP>99m</SUP>Tc-MDP and <SUP>18</SUP>F-FDG. X-ray energies were measured on effective energy of 26.2~45.6keV when additional filtering plate of 0, 2mmAl is used within the range of tube voltage 40~120kVp, and at this time, apron 0.5mmPb has shown about 5.5% of increase in its shielding rate over 0.25mmPb at the highest quality. Besides, the aprons of the two types have shown high shielding rate of over 90% for direct X-ray and spatial dose rate. And, in case 0.25 and 0.5mmPb aprons were used at 140keV of <SUP>99m</SUP>Tc-MDP, the shielding effects were between 30 and 53%, and at high energy of 511keV, <SUP>18</SUP>F-FDG, the shielding effects of apron, 1.3~3.6%, were very small.

전신 PET/CT 검사에서 공간선량률 측정

박명환(Myeong-Hwan Park) 대한방사선과학회(구 대한방사선기술학회) 2006 방사선기술과학 Vol.29 No.4

  전신 PET/CT 검사에서 ¹?F-FDG의 방사성의약품을 투여한 환자가 방사선원이 되기에 환자로부터 종사자의 피폭선량 예측을 위한 PET 검사실에서 환자 주변의 공간선량률을 측정ㆍ분석하였다. 연간 개인피폭선량은 대학병원의 핵의학 분야에 근무하는 종사자가 방사선종양학과와 소규모병원의 진단방사선 분야에 비해 검사 중에 환자로부터 방출되는 공간선량률에 의하여 개인피폭선량이 높게 나타났다. 그리고 PET/CT 검사에서 ¹?F-FDG를 이용하는 경우에 <SUP>99m</SUP>Tc 보다 공간선량률이 4~6배 정도로 훨씬 높고, 촬영실 전체에 공간선량률이 분포함을 알 수 있었다. 따라서 방사성의약품 투여 후 안정실이나 PET 검사 중에 촬영실 내에서는 항상 방사선 방어의 기본인 시간은 짧게, 거리는 멀리, 차폐를 고려하여 PET 검사를 수행하는 것이 매우 중요하고, 환자로부터의 공간선량률에 따른 종사자의 개인피폭선량을 줄이기 위한 최선의 노력이 필요하다.   In order to evaluate the exposure to the radiologic technologists from patients who had been administrated with radiopharmaceuticals, we measured the spatial dose rates at 5~300㎝ from skin surface of patients using an proportional digital surveymeter, 1.5(PET scan) and 4hr(bone scan) after injection. In results, the exposure to the technologists in each procedure was small, compared with the dose limits of the medical workers. However, the dose-response relationships in cancer and hereditary effects, referred to as the stochastic effects, have been assumed linear and no threshold models; therefore, the exposure should be minimized. For this purpose, the measurements of spatial dose rate distributions were thought to be useful.

방사선과 졸업생의 학업성취도와 면허 취득의 관계

박명환(Myeong-Hwan Park),권덕문(Deok-Moon Kwon),서수교(Soo-Kyo Seo) 대한방사선과학회(구 대한방사선기술학회) 2006 방사선기술과학 Vol.29 No.1

  This study analyzed the correlations between variables like characteristics related to admission, academic achievement, obtainment of a radiological technology license.   A majority of participants were from Daegu and academic high schools. Many participants were accepted by general admission selection, and their reason to apply to Daegu Health College was high graduate employment. Their selection for the academic program was made by their parents and themselves. Those who took the same course twice held 35.1%, and those who got an academic warning took 8.5%. The degree of participants" academic achievement showed somewhat low, and they had difficulty in taking their major courses. The average grade for admission was lower in a following selection order: college graduates, general, special, and rural areas. The admission selections and taking science courses in high school showed little significant correlations with obtainment of a radiological technology license. However, the obtainment of the license had significant correlations with retaking the same course, getting an academic warning, and the degree of academic achievement. The results also revealed that the obtainment of the license had little significant correlations with a part-time job experience, having a boy/girlfriend, and student club participation, but it had significant correlations with accommodations and study club participation.   In conclusion, it is important to point out that radiological technology graduates" obtainment of a license is closely related with the degree of their academic achievement and their college life.   방사선과 졸업생을 대상으로 입학 관련 특성, 재학 중의 학업성취도 및 학교생활에 따른 방사선사 면허 취득의 상관관계를 분석하였다.   출신고교의 지역 및 계열은 대구지역의 인문계 출신자가 대부분이었으며, 일반전형 입학이 가장 많았고, 입학 동기는 높은 취업률 때문이었으며, 학과 선택은 본인과 가족이 함께 결정하는 것으로 나타났다. 또한 재수강은 35.1%가 하였으며, 학사경고는 8.5%가 받았고, 학업성취도는 대체적으로 본인 스스로가 낮다고 생각하였으며, 전공과목 이수에 어려움이 있는 것으로 대답하였다. 입학전형별 취득한 평균평점은 대학졸업자전형, 일반전형, 특별전형, 농어촌전형 순으로 낮았으며, 입학전형 종류와 이과 과목 이수 여부에 따른 방사선사 국가고시 합격률은 통계적으로 유의한 차이가 없었으며, 재수강, 학사경고, 학업성취도에 대해서는 통계적으로 매우 유의한 차이가 있음을 알 수 있었다. 또한 학교생활에 있어서 아르바이트 경험, 이성교제 및 동아리 활동 유무는 통계적으로 유의한 차이가 없었으나, 거주형태가 본가인 경우와 스터디 활동을 한 경우에는 통계적으로 유의한 차이를 나타내어 방사선과 졸업생의 면허 취득은 재학 중의 학업성취도와 학교생활과 밀접한 관계가 있으므로 중요성을 인식할 필요가 있다고 생각한다.

Li₂B₄O_7 계열 단결정 TLD 소자의 제작과 특성

박명환(Myeong Hwan Park),박강수(Kang Soo Park) 대한방사선과학회(구 대한방사선기술학회) 2005 방사선기술과학 Vol.28 No.1

본 연구에서는 Czochralski법으로 양질의 Li₂B₄O_7 단결정과 Cu, Mn, Mg를 활성제로 첨가한 Li₂B₄O_7 계열 단결정을 육성하였다. 또한 이들을 TLD 소자로 제작하고, 감쇠율 및 에너지의존성의 열형광 특성을 조사하였다. 실온에 보관하면서 각 TLD들의 주 peak에 대한 감쇠율을 측정한 결과, 30일 동안 10% 내외의 감쇠율로 비교적 안정하였다. 소자 형태의 단결정 TLD가 분말 형태보다 감쇠율이 다소 낮게 나타났으며, 그 이유는 소자 형태의 단결정 TLD가 흡습성에 의한 영향을 적게 받기 때문인 것으로 생각된다. 그리고 각 TLD 소자의 광자에 대한 에너지의존성은 32keV의 열형광 감도가 1.25MeV의 (60)^Co γ선에 비해 약 85% 정도이며, 이론적 계산값과 측정값이 대체로 잘 일치하는 결과이다. 이상에서와 같이, 본 연구에서 제작한 Li₂B₄O_7 : Cu와 Li₂B₄O_7 : Mn 단결정 TLD는 X선에 대한 감쇠율 및 에너지의존성의 특성이 우수하다. 따라서 의료기관 및 산업체 분야에서 개인피폭선량 측정, 환경방사선 측정, 방사선 치료시의 선량 평가에 활용이 가능할 것으로 생각한다. High-quality single crystals of pure Li₂B₄O_7 as well as Li₂B₄O_7 doped with Cu, Mn and Mg impurities (1.0 ㏖ %, respectively) have been grown from the melt of Li₂CO₃ +2B₂O₃ by Czochralski method in platinum crucibles. To study the thermoluminescent properties, Li₂B₄O_7 series single crystal TLDs were made by cutting in the size of 4×5×1㎣. The glow curves show two or three peaks which can be easily deconvoluted. It is observed that room temperature(20~30℃) fadings of the dosimetric peaks of Li₂B₄O_7 series single crystal TLDs were about 10 % for 30 days. The relative photon energy response for Li₂B₄O_7 series single crystal TLDs were about 85 % when the responses were normalized to that measured with (60)^Co(1.25 MeV) γ-rays. The measured data are in a good agreement with theoretical ones. The Li₂B₄O_7 series single crystal TLDs fabricated in this work can be used for monitoring personal and environmental radioactivity.

물리센서 - CaSO4 : Tm - PTFE TLD 를 이용한 고에너지 전자선의 흡수선량 측정

박명환(Myeong Hwan Park),김도성(Do Sung Kim),도시홍(Sih Hong Doh),김완(Wan Kim),강희동(Hee Dong Kang) 한국센서학회 2001 센서학회지 Vol.10 No.5

N/A In this study, the highly sensitive CaSO₄:Tm-PTFE TLDs has been fabricated for the purpose of measurement of high energy electron. CaSO₄:Tm phosphor powder was mixed with polytetrafluoroethylene(PTFE) powder and moulded in a disk type(diameter 8.5mm, thiclmess 90mg/㎠) by cold pressing. The batch uniformities were average deviation 3.1 %. The TLDs were applied to measurement of absorbed dose distribution for high energy electron, the ranges were determined to be R_(100)=14.5mm, R_(50)=24.1mm and R_p=31.8mm, respectively. The beam flatness were 4.5 as the variation of dose relative to the central axis over the central 80% of the field size at a maximum dose depth in a plane perpendicular to the central axis.

복부 단순촬영에서 EPD를 이용한 공간선량의 측정

박명환 (Myeong-Hwan Park) 대구보건대학 2008 대구보건대학 論文集 Vol.28 No.-

Performance test of diagnosis X-ray satisfied the test standard when the study measured tube voltage, exposure time and output reappearance. Spatial doses by scattered ray in tube voltage 70~78kVp, tube current 200mA and exposure time 0.3sec which were conditions of simple abdomen were measured to be each average 0.054, 0.018, 0.008, 0.004, 0.002mSv in 50, 100, 150, 200, 250cm. When test conditions were the same, spatial dose was somewhat increased rather in vertical distribution than in horizontal distribution in the same distance from the center of field. Tube voltage was set up higher in photographing conditions of male than in photographing conditions of female and spatial dose was set up higher. Also, the study could measure spatial dose simply with high-speed EPD and could see that spatial dose was distributing in all of radiographic room. Therefore, it is required that you reduce time staying within a room during radiography if possible. And it is thought that you must wear an apron when you should be exposured in radiation inevitably.

ERP(Enterprise Resource Planning) 도입에 따른 의료 환경 변화에 대한 연구

김선칠,박명환,Kim, Sun-Chil,Park, Myeong-Hwan 대한디지털의료영상학회 2003 대한디지털영상기술학회지 Vol.6 No.1

In recent years, many computer systems that are used for patient diagnostic and treatment purpose s are being introduced within hospitals. Therefore, being in a position to manage the hospital entirely, efforts to integrate their own unique system into one have started. A system values humans and creates the surrounding atmosphere into one which maximizes the abilities of individuals. For this, a scientific integration management operation system is required. The type of system that is demanded due to this requirement is an ERP(Enterprise Resource Planning) system. Lately, even the hospital industry is beginning to show interest in efficient administrative methods. To deliver more predominant medical services, hospitals are trying to introduce scientific administrative methods, whose superiority were proven in enterprises, to the operation system of the hospital organization. ERP values humans over systems, and within a superior system, emphasizes the efficiency of the organization. This sort of process does not just evaluate and manage the working abilities of individuals, but provides an advanced working environment that increases the abilities of members within the organization by fold. Therefore, this research estimates through questionnaires and introductive cases how the introduction of ERP may change the work of customers within hospitals such as the radiologic technology department, and how it may also change the environment of medical services, thus striving to create a radiologic technology department that will not fall behind the times.

임베디드 웹 브라우저 기반의 3-Screen 영상서비스 개발

송한춘,박명환,Song, Han-Chun,Park, Myeong-Hwan 한국인터넷방송통신학회 2011 한국인터넷방송통신학회 논문지 Vol.11 No.1

본 논문에서는 하나의 애플리케이션을 개발/제작하여 모바일 스마트폰, 인터넷TV, 인터넷PC에서 동일하게 서비스를 제공할 수 있는 3-Screen 영상서비스 시스템을 개발하였다. 개발시스템은 동일한 임베디드 웹 브라우저를 각 3-Screen 영상서비스 단말에 탑재하여 영상서비스를 제공하게 된다. 개발시스템의 성능을 평가하기 위하여 농업생활 정보 애플리케이션을 본 논문에서 개발한 임베디드 웹 브라우저를 각 모바일 스마트폰, IPTV에 탑재하여 LG유플러스 통신망을 통하여 성능시험을 실시하였다. 성능시험결과 3-Screen서비스가 각 단말에서 원활하게 제공됨을 확인하였다. 논문의 구현결과는 향후 3-Screen 기반의 다양한 애플리케이션 개발에 활용이 가능할 것이다. 3-Screen service means that one video contents is operated on 3 different terminals(smart-phone, IP-TV, internet PC) with same service browser. In this paper, we developed 3-Screen video service system based on imbedded web browser. We evaluated and analysed of developed 3-Screen service system through Agribusiness video service offering test environment on the LG U+ network. As a result of tests, it showed that 3-Screen video service was well performed in each 3-Screen service terminals. The result of this paper will be utilized in various application developments for the 3-Screen video service in the future.