제42차 춘계학술대회 : 포스터 연제 ; 운륜 모반을 보인 선천성 거대 색소성 모반 1예

성열훈,성범진,이증훈,박장규 대한피부과학회 1990 초록집 Vol.28 No.20

방사선 정보원과 전공 선택 만족도의 상관관계 분석: 한·미 방사선학과 대학생들 중심으로

성열훈 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.6

The purpose of this study was to analyze the correlation between radiation information sources and major selection satisfaction in radiologic science students of Korean and American. The subjects of this study were first-grade and second-grade at one university in Chungbuk, Korea and one university in Texas, USA. The survey study investigated from May 7, 2019 to May 28, 2019. As a result, first, these college students in both countries used the internet the most as them, but the percentage of information collected through textbooks was significantly higher among American college students. Second, Korean college students had a higher level of reliability in information sources than American college students in the order of internet, newspapers, and social network service (SNS), except government prints. Third, American college students had significantly higher satisfaction in major selection than Korean college students. Fourth, Korean college students were helped to select majors through various information sources, especially, the correlation coefficient between SNS was significantly higher. 본 연구에서는 한국과 미국 방사선학과 대학생들을 대상으로 방사선 정보원과 전공 선택 만족도의 상관관계를 분석하고자 하였다. 본 연구의 대상자는 한국의 충북 소재의 일개 4년제 대학교와 미국의 텍사스 주 소재의 일개 4년제 대학교의 방사선학과 1, 2 학년을 대상으로 하였다. 설문조사는 2019년 5월 7일부터 5월 28일까지 방사선 정보원과 정보원 신뢰도 그리고 방사선학과 선택 만족도에 대해 자기기입방식으로 조사하였다. 그 결과 첫째, 양국 대학생 모두 인터넷을 가장 많이 사용하는 정보원이지만 교과서를 통한 정보 수집 비중은 미국 대학생들이 유의하게 높았다. 둘째, 한국 대학생들은 미국 대학생들보다 정보원에 대한 신뢰도가 정부의 인쇄물을 제외한 인터넷, 신문, 소셜 네트워크 순으로 유의하게 높았다. 셋째, 미국의 대학생들은 한국 대학생들보다 방사선학과 선택 만족도가 유의하게 높았다. 넷째, 한국 대학생들은 다양한 정보원을 통해 전공 선택에 도움을 받고 있었으며 특히, 소셜 네트워크간의 상관계수가 유의하게 높은 상관관계를 나타냈다.

의료용 디지털방사선영상의 공간분해능 최적화에 의한 소듐냉각고속로 연료봉 내부의 소듐 충전상태 평가

성열훈 한국방사선학회 2016 한국방사선학회 논문지 Vol.10 No.2

본 연구에서는 디지털 의료용 X선을 이용하여 소듐냉각고속로 금속연료봉 내부의 소듐 충전상태를 평가 하고자 하였다. 의료용 X선은 디지털방사선(digital radiography, DR)시스템을 사용하였다. 최상의 공간분해 능을 도출하기 위해 X선관의 초점크기와 디지털영상후처리 방법을 변화시켰다. 이때 텅스텐을 이용한 에 지방법의 변조전달함수(modulation transfer function, MTF)를 사용하여 선예도(0.5 MTF)와 해상도(0.1 MTF) 를 평가하였다. 그 결과 소초점에서 영상후처리의 대조도를 강화시킨 조건에서 3.871 lp/mm (0.1 MTF)와 3. 290 lp/mm (0.5 MTF)의 공간분해능을 얻었다. 결론적으로 이러한 결과는 디지털 의료용 X선을 이용하여 소듐냉각고속로 금속연료봉 내부의 소듐 충전상태를 관찰할 수 있었다. The purpose of this study was tried to evaluate the filling sodium states inside the fuel rod of sodium-cooled fast reactor by digital medical X-ray. We used the diagnostic X-ray generators in digital radiography (DR). This study have found the optimal conditions by changing the effective focal spot size of X-ray tube and post-processing of the DR method with a tungsten edge plate in order to ensure excellent sharpness At this time, the sharpness and resolution were evaluated using the MTF (modulation transfer function). As a result, this study obtained a spatial resolution of 3.871 lp/mm (0.1 MTF), 3.290 lp/mm (0.5 MTF) when implemented the contrast strengthen post-processing in small focal spot. In this research, the result is able to evaluate the level of sodium inside the fuel rod by using the diagnostic X-ray generators in medical digital radiographic images.

진단용방사선발생장치 안전관리 기준에 의한 임상 진당용 X선장치의 정확성과 재현성 평가

성열훈 청주대학교 보건의료과학연구소 2018 보건의료과학연구 Vol.6 No.2

The purpose of this study was to investigate and analyze the accuracy and reproducibility of the diagnostic X ray system based on the safety management standard of the diagnostic radiation generators. The target medical institutions selected five secondary medical centers with 18 diagnostic X ray systems in Cheongju area from 2015 to 2017. The evaluation items of accuracy and reproducibility by the safety management standard of Korea ministry of food and drug safety (KMFD) were seven items in the following order: percent line voltage regulation, exposure dose reproducibility, kVp accuracy, light field radiation field congruence, central ray alignment, illumination, half value layer. As a result, the exposure dose reproducibility, kVp accuracy and illumination test showed relatively low acceptance rate, and it is would necessary to continuously manage it.

3 차원 자동 영상 정합을 이용한 뇌혈관 축출 오류에 대한 보정

성열훈 청주대학교 2011 産業科學硏究 Vol.29 No.1

The purpose of this study was to compensate of error in the cerebral vessels subtraction by using 3-dimension of automatic image fusion. The 20 patients who requested brain angiography were examined all the settings by 512 × 512 matrix size in order to get the same matrix size. The 3-dimension data sets of the pre scan data and the post data were obtained same as a field of view (FOV). We used the 16 multi-channel computed tomography (MDCT) that the scan parameters were the 0.5 seconds for the X-ray tube rotation time, the thickness of 2.0 mm, and increment of 1 mm. The obtained 3-dimension data sets extracted from the cerebral vessels by using automatic inter(=mono)-modality registration application. However the error was occurred by the patient's temporomandibular joint motion. So this study suggested the compensate method that the patient bit the bar. Finally the errors in the cerebral vessels subtraction by using 3-dimension of automatic image fusion were reduced.

64 다중 검출기 전산화단층촬영에서 관전류 자동노출조절 기법을 이용한 두개부 방사선량 감소 정도 평가

성열훈,김영옥,최보영,Seoung, Youl-Hun,Kim, Yong-Ok,Choe, Bo-Young 한국의학물리학회 2010 의학물리 Vol.21 No.2

64 multi-detector computed tomography (MDCT)에서 두개부의 과도한 선량이 문제가 되어 고정관류기법과 관전류 자동노출조절(automatic exposure control, AEC) 기법을 이용하여 선량 감소 정도를 비교 평가하고자 한다. 연구에 사용한 장비는 Siemens사의 SOMATOM Definition 64 multi-detector CT를 이용했으며, Whole body phantom (KUPBU-50, Kyoto Kagaku CO. Ltd)의 두개부를 사용했다. 실험 protocol은 helical scan 방식을 적용하여 120 kVp, rotation time은 1 sec, slice thickness와 increment는 각각 5 mm, FOV는 250 mm, matrix size는 $512{\times}512$, collimation은 $64{\times}0.625\;mm$, pitch는 1로 조사하였다. 선량감소효과의 측정방법은 관전류를 350 mAs로 고정한 방법과 AEC 기법을 적용한 방법으로 나누어 평가하였으며, 영상품질은 CT number의 표준편차를 이용하여 영상의 잡음을 측정하였다. 이 때 두개부(craniofacial bone)는 머리덮개뼈(calvaria) 끝부분에서 눈썹활(superciliary ridge)까지를 1구역, 논썹활 아래부터 코가시점(acanthion)까지를 2구역, 그리고 코가시점 아래부터 턱(mentum)끝까지를 3구역으로 정의하여 측정하였다. 고정관류기법에서 구역별로 CTDIvol은 57.7 mGy였으며, DLP는 $640.2\;mGy{\cdot}cm$로 동일하였다. AEC 기법을 적용한 1구역은 CTDIvol: 30.7 mGy, DLP: $340.7\;mGy{\cdot}cm$, 2구역은 CTDIvol: 46.5 mGy, DLP: $515.0\;mGy{\cdot}cm$, 그리고 3구역은 CTDIvol: 30.3 mGy, DLP: $337.0\;mGy{\cdot}cm$으로 나타났다. 영상품질을 나타내는 CT number의 표준편차는 1구역에서 고정 관류기법은 2.6, AEC 기법은 3.0, 2구역에서 고정 관류기법은 3.1, AEC 기법은 3.4, 3구역에서 고정 관류기법은 2.7, AEC 기법은 3.2으로 측정되었다. 64 MDCT에서의 AEC 기법은 기존의 고정관류법에 비해 안구, 이하선 그리고 갑상선 부위에 대해 큰 선량 감소효과가 나타났으며, 두개부의 방사선량을 감소시키는데 매우 유용한 기법으로 사료된다. The purpose of this study was to evaluate the usefulness of reducing of craniofacial radiation dose using automatic exposure control (AEC) technique in the 64 multi-detector computed tomography (MDCT). We used SOMATOM Definition 64 multi-detector CT, and head of whole body phantom (KUPBU-50, Kyoto Kagaku CO. Ltd). The protocol were helical scan method with 120 kVp, 1 sec of rotation time, 5 mm of slice thickness and increment, 250 mm of FOV, $512{\times}512$ of matrix size, $64{\times}0.625\;mm$ of collimation, and 1 of pitch. The evaluation of dose reducing effect was compared the fixed tube current of 350 with AEC technique. The image quality was measured the noise using standard deviation of CT number. The range of craniofacial bone was to mentum end from calvaria apex, which devided three regions: calvaria~superciliary ridge (1 segment), superciliary ridge~acanthion (2 segment), and acanthion~mentum (3 segment). In the fixed tube current technique, CTDIvol was 57.7 mGy, DLP was $640.2\;mGy{\cdot}cm$ in the all regions. The AEC technique was showed that 1 segment were 30.7 mGy of CTDIvol, 340.7 $mGy{\cdot}cm$ of DLP, 2 segment were 46.5 mGy of CTDIvol, $515.0\;mGy{\cdot}cm$ of DLP, and 3 segment were 30.3 mGy of CTDIvol, $337.0\;mGy{\cdot}cm$ of DLP. The standard deviation of CT number was 2.622 with the fixed tube current technique and 3.023 with the AEC technique in the 1 segment, was 3.118 with the fixed tube current technique and 3.379 with the AEC technique in the 2 segment, was 2.670 with the fixed tube current technique and 3.186 with the AEC technique in the 3 segment. The craniofacial radiation dose using AEC Technique in the 64 MDCT was evaluated the usefulness of reducing for the eye, the parotid and thyroid with high radiation sensitivity particularly.

군장교 후보생과 의료방사선 전공학생의 방사선 인식도 비교

성열훈 청주대학교 보건의료과학연구소 2014 보건의료과학연구 Vol.2 No.2

The purpose of this study was to present basic research data to utilize of having the correct perception, after investigating the awareness of radiation for military officer candidate versus medical radidtion majoring students. The methodological design was based on a quantitative survey and a ferquency analysis was done. The analysis objects were survey papers (N=300) answered by that targeted related majors at a Cheongju university. the questionnaires, and study tool, were directly distributed and collected from 1 April to 31 May in 2013. A total of 16questionnaires was 'self perception of radiation' radiation risk' benefit from radiation' 'radiation controllde'. As the result of the questionnaires, compared with the medical radiation majors' students. the radiation awareness of military officer candidate was found that generally negative preception of radiation with a low level of radiation knowledge. we suggested that curriculum based on objective and having the correct perception of radiation may need to military officer anddidate. Improving awareness of radiation might have significant contributions to reducing conflict due to the prejudice and misunderstanding of radiation

대학생들의 방사선 위험 인식이 관리와 편익에 미치는 구조적 관계

성열훈,김성수 한국디지털정책학회 2014 디지털융복합연구 Vol.12 No.2

Evaluation of Radiation Dose Reduction during CT Scans by Using Bismuth Oxide and Nano-Barium Sulfate Shields

성열훈 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.1

The purpose of the present study was to evaluate the radiation dose reduction and the image quality during CT scanning by using a new dose reduction fiber sheet (DRFS) with commercially available bismuth shields. These DRFS, were composed of nano-barium sulfate (BaSO4) filling the gaps left by the large bismuth oxide (Bi2O3) particles. The radiation dose was measured five times at a direction of 12 o’clock from the center of the polymethyl methacrylate (PMMA) head phantom by using a CT ionization chamber to calculate an average value. The image quality of measured CT transverse images of the PMMA head phantom depended on the X-ray tube voltage and the type of shielding. Two regions of interest in the CT transverse images were chosen, one from the right area and the other from the left area under the surface of the PMMA head phantom and at a distance of ion chamber holes located in a direction of 12 o’clock from the center of the PMMA head phantom. The results of this study showed that the new DRFS shields could reduce the dosages by 15.61%, 23.05%, and 22.71% at 90 kVp, 120 kVp, and 140 kVp, respectively, than with these of a conventional bismuth shield of the same thickness while maintaining image quality. In addition, the DRFSs produced were about 25% thinness than conventional bismuth. We conclude, therefore, that a DRFS can replace conventional bismuth as a new shield.

Analysis of Three-Dimensional Fiber Tractography of the Corpus Callosum with Changing Number of Diffusion Direction by Using Magnetic Resonance Diffusion Tensor Imaging at 3.0 Tesla

성열훈 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.3

The purpose of the present study was to evaluate the effects of the fractional anisotropy (FA) and of the number and the length of the fibers of three dimensional fiber tractography of the corpus callosum (CC) with changing number of diffusion directions in the normal adult brain by using 3.0 Tesla magnetic resonance diffusion tensor imaging (DTI). DTI of the CC was performed in 15 healthy adult volunteers (25.1 ± 5.6 years, 8 females, 7 males) with different diffusion sensitizing gradient directions (6, 15, and 32) while all of the other parameters were kept constant. A single shot spin-echo planner imaging technique was used at 3.0 Tesla with the following parameters: the repetition time (TR) = 10,990 ms, the time echo (TE) = 80 ms, flip angle = 90˚, the number of excitation (NEX) = 2, b value = 800 s/mm^2, the sensitivity encoding (SENSE) factor = 2, measured voxel size = 2 × 2 × 2 mm^3 with a SENSE head coil. The scanning times were 2 min 13 sec for 6 directions, 6 min 50 sec for 15 directions, and 12 min 27 sec for 32 directions. For the diffusion tensor imaging, the range of the axial images was from the skull base to the skull vertex. The region of interest in the midsagittal area of the CC was divided into five sections: genu, anterior midbody, posterior midbody, isthmus and splenium. The FA values and the numbers and length of tracked fibers were compared between 6, 15, and 32 directions by using a statistical analysis. The results of this study showed that the FA values and the length of tracked fibers for 15 directions versus 32 directions were not significantly different, and the numbers of tracked fiber differences among all directions were not statistically significant.