• Nuclear Engineering and Technology
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• 제55권7호
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• pp.2388-2394
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• 2023

The radioactivity concentration of environmental radionuclides was analyzed for soil and sand at eight locations within a radius of 255 m centered on the Dongnam Institute of Radiological & Medical Science (DIRAMS), Korea. The average activity concentrations of ⁴⁰K, ¹³⁷Cs, ²²⁶Ra, and ²³²Th were 661.1 Bq/kg-dry, 0.9 Bq/kg-dry, 21.9 Bq/kg-dry, and 11.1 Bq/kg-dry, respectively. The activity of ⁴⁰K and ¹³⁷Cs was lower than the 3-year (2017-2019) average reported by the Korea Institute of Nuclear Safety, respectively. Due to the nature of granite-rich soil, the radioactivity of ⁴⁰K was 0.6-fold higher than in other countries, while ¹³⁷Cs was in the normal fluctuation range (15-30 Bq/kg-dry) of the concentration of radioactive fallout from nuclear tests. The activity of ²²⁶Ra and ²³²Th was lower than in Korean soils reported by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). The average activity concentrations of ²³²Th and ⁴⁰K for the soil and sand samples from DIRAMS were within the range specified by UNSCEAR in 2000. The radium equivalent activity and internal and external hazard index values were below the recommended limits (1 mSv/y). These radionuclide concentration (²²⁶Ra, ²³²Th, ⁴⁰K, and ¹³⁷Cs) data can be used for regional environmental monitoring and ecological impact assessments of nuclear power plant accidents.

• 대한방사선기술학회지:방사선기술과학
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• 제16권2호
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• pp.73-79
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• 1993

• 대한방사선기술학회지:방사선기술과학
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• 제19권2호
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• pp.67-70
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• 1996

• 디지털융복합연구
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• 제12권3호
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• pp.339-344
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• 2014

현재 우리나라 유방촬영장치의 정도관리 항목에는 국제규격에서 원하는 직선성이 빠져있다. 직선성은 방사선량 및 방사선질의 조정을 위한 요구사항이다. 본 연구에서는 유방촬영장치 5대를 대상으로 IEC 60601-2-45 규격에 맞는 직선성을 시험한 결과 모두 적합한 결과를 보였으며 앞으로 좀 더 발전된 정도관리를 위해서는 지속적인 측정관리가 필요하다.

• 대한방사선기술학회지:방사선기술과학
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• 제29권2호
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• pp.93-98
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• 2006

방사선과의 의료 서비스에 대한 환자의 만족도 평가 및 방사선사와 환자간의 인식차를 평가하여 방사선과 의료 서비스의 개선방향에 대해 알아보았다. 그 결과 대부분의 설문결과에"보통이다"이상의 답변을 하였으며, 부족한 부분으로는"접수수속의 복잡함, 검사 대기시간이 긴 점 및 환자 보호자의 방사선차폐 미실시"를 들었다. 또한 이 항목들은 환자뿐 아니라 방사선사들도 인식을 하고 있는 부분으로 환자에 대한 적극적인 배려가 필요하다고 사료된다. 그리고 방사선사와 환자의 인식차를 줄이기 위해서는 서비스를 제공하는 방사선사의 노력이 가장 필요하며, 이를 위해서는 정기적으로 환자관점에서의 의료서비스 만족도 조사를 통해 환자가 느끼는 서비스의 품질수준을 평가하고 만족도가 낮은 사항에 대해서는 만족도를 높이기 위한 개선책 마련에 힘써야 할 것이다.

• 대한방사선기술학회지:방사선기술과학
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• 제28권1호
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• pp.45-53
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• 2005

전국 16개 시도의 44개 3차 의료기관에 근무하는 방사선사의 직무환경에서 발생되는 스트레스원과 개인적인 관련요인을 분석한 결과는 다음과 같다. 근무환경에서 스트레스원에 영향을 주는 개인적인 관련요인은 직위, 직무만족도, 신체화 증상이고, 역할관련에서는 직무만족도와, 신체적 증상이며, 직무안정성에 있어서는 직위와 직무만족도가 많은 영향을 주는 요인으로 나타났다. 직무자율성에서 영향을 주는 요인은 연령, 직위, 직무만족도이고, 직무부담에서는 직무만족도, 행동적 증상이며, 직무갈등에서는 직장동료, 직속상관, 직무만족도, 신체적 증상이 영향을 많이 주고 있는 것으로 나타났다.

• 대한방사선기술학회지:방사선기술과학
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• 제46권1호
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• pp.1-8
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• 2023

As the demand for bone mineral density testing increases in Korea, which is close to an aging society, it is necessary to evaluate the repeatability of equipment such as femur phantom other than l-spine for more accurate diagnosis. However, in clinical practice, it is often not possible to proceed such evaluation due to insufficient quality control conditions. Therefore, this study is to evaluate the usefulness of the femur phantom after fabricating the same using 3D printing technology. The femur phantom was output using GlowFill filament and FDM 3D printing type. Each phantom was repeatedly scaned 20 times to compare whether the existing l-spine phantom and the fabricated femur phantom were suitable as a phantom for quality control. Each time the seven researchers took three times, the location of the femur phantom was readjusted, and then scanned to confirm the error between the researchers. As a result of conducting repeatability evaluation using femur phantom, the coefficient of variation rate was 2%, which was within the minimum precision tolerance of 2.5%. The reproducibility between the researcher was also found to be suitable as the average coefficient of variation was 0.031 and the coefficient of variation rate was 3.1%, which was within the minimum precision error range of 5%. In conclusion, it is considered that the prospective attitude and usefulness of the femur phantom fabricated by 3D printing in clinical practice will be sufficient.

• 한국방사선학회논문지
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• 제17권7호
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• pp.1197-1205
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• 2023

본 연구에서는 영남지역 해수욕장의 모래 시료 중에 함유되어 있는 방사능 농도를 측정하였다. 해수욕장에서 채취한 모래 표본은 영남지역의 유명해수욕장 8곳을 대상으로 선정하였다. 모래 표본을 반도체검출기인 고순도게르마늄검출기(HPGe)에 넣어 다채널분석기(MCA)를 이용한 정밀 감마 방사성핵종 분석을 실시했다. 방사선핵종의 농도를 측정하기 위해 측정 시간을 8,000 초로 설정하여 스펙트럼 파일을 얻어서 감마 방사성핵종의 농도를 분석하였다. 연구결과 8곳 해변 모두 TI-208의 방사능이 가장 높았다. 결론적으로 영남지역 해수욕장 모래표본에서 검출된 방사성핵종은 자연 방사성핵종이지만 인체 내부에 영향을 미칠 수 있다. 따라서 지속적으로 조사할 필요가 있다.

• 한국인공지능학회지
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• 제9권2호
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• pp.1-5
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• 2021

Although CT has an advantage in describing the three-dimensional anatomical structure of the human body, it also has a disadvantage in that high doses are exposed to the patient. Recently, a deep learning-based image reconstruction method has been used to reduce patient dose. The purpose of this study is to analyze the dose reduction and image quality improvement of deep learning-based reconstruction (DLR) on the adult's chest CT examination. Adult lung phantom was used for image acquisition and analysis. Lung phantom was scanned at ultra-low-dose (ULD), low-dose (LD), and standard dose (SD) modes, and images were reconstructed using FBP (Filtered back projection), IR (Iterative reconstruction), DLR (Deep learning reconstruction) algorithms. Image quality variations with respect to varying imaging doses were evaluated using noise and SNR. At ULD mode, the noise of the DLR image was reduced by 62.42% compared to the FBP image, and at SD mode, the SNR of the DLR image was increased by 159.60% compared to the SNR of the FBP image. Based on this study, it is anticipated that the DLR will not only substantially reduce the chest CT dose but also drastic improvement of the image quality.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.322-323
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• 2002

Partial volume averaging effect of PET data influences on the accuracy of quantitative measurements of regional brain metabolism because spatial resolution of PET is limited. The purpose of this study was to evaluate the accuracy of partial volume correction carried out on $^{18}$ F-PET images using Hoffman brain phantom. $^{18}$ F-PET Hoffman phantom images were co-registered to MR slices of the same phantom. All the MR slices of the phantom were then segmented to be binary images. Each of these binary images was convolved in 2 dimensions with the spatial resolution of the PET. The original PET images were then divided by the smoothed binary images in slice-by-slice, voxel-by-voxel basis resulting in larger PET image volume in size. This enlarged partial volume corrected PET image volume was multiplied by original binary image volume to exclude extracortical region. The evaluation of partial volume corrected PET image volume was performed by region of interests (ROI) analysis applying ROIs, which were drawn on cortical regions of the original MR image slices, to corrected and original PET image volume. From the ROI analysis, range of regional mean values increases of partial volume corrected PET images was 4 to 14%, and average increase for all the ROIs was about 10% in this phantom study. Hoffman brain phantom study was useful for the objective evaluation of the partial volume correction method. This MR-based correction method would be applicable to patients in the. quantitative analysis of FDG-PET studies.