• Proceedings of the Korean Society of Medical Physics Conference
• /
• 2006.08a
• /
• pp.153-153
• /
• 2006

• Journal of the Korean Society of Radiology
• /
• v.7 no.6
• /
• pp.389-395
• /
• 2013

This study intended to investigate the optimum conditions for lumbar test that has the highest level of irradiation conditions among general test sites. To to this, the most widely used irradiation conditions in terms of statistics were set as standards; test groups applied with DMF were selected; tests groups suitable for clinical trials were selected by using suggested patient dose. Blind tests were conducted by 10 specialists and radiologists. The results suggested that under the optimum conditions, the radiation dose reduction of 2.09 mGy, 4.42 mGy and 3.65 mGy can be achieved in forward-backward test, lateral test and 4-direction test, respectively. There is a need of further studies on the optimization of irradiation conditions in accordance with the conditions of patients.

• Journal of radiological science and technology
• /
• v.27 no.4
• /
• pp.67-74
• /
• 2004

In order to assess policies for training of radiological technologists and public health, this study was conducted from the mid July to the end of August 2003 to the subjects of 890 radiological technologists who work at 44 general hospitals in 16 cities and provinces of the country. For this purpose, an analysis of variance was performed by regions divided in Capital city, metropolitan areas and small- and medium-sized cities as well as by length of service. The outcomes look as follows : 1. From the analysis of replies to questions about the government health policy for radiological technologists, high scores were given to the items: "the Law of Medical Engineers should be revised from the pattern of supervision to assignment" and "the medical institutions should be legally obliged to secure certain number of radiological technologists". 2. From the analysis of variance by regions and groups, there was difference by regions in the items: "demand and supply of radiological technologists should be controlled" and "the license number of radiological technologists should be indicated in the medical insurance bill"(p<0.000). 3. From the analysis of variance as to training of radiological technologists, a significant difference was found by length of service in the items: "it is necessary to open a 4-year department of radiology and to revise curriculum" and "the legal system to indicate license number of radiological technologists in the medical insurance bill should be introduced". 4. The analysis of variance by length of service revealed that those who have served for more than 20 years favored "it is necessary to open a 4-year department of radiology and to revise curriculum" higher than those who have served for less than 5 years, showing a tendency the longer they work, the stronger they feel necessity".

• Journal of radiological science and technology
• /
• v.41 no.6
• /
• pp.627-635
• /
• 2018

The purpose of this study was to compare the job stress, job satisfaction, turnover intention, and job performance feelings of radiological technologists, physical therapists, and medical laboratory technologists working at university hospitals and general hospitals. The subjects were 114 general practitioners and 217 university hospital workers who are engaged in occupations of radiological technologists, physical therapists, and medical laboratory technologists in the age groups 20-50 years living in Incheon Metropolitan City. Data collection was conducted from April 1, 2017 to April 30, and data analysis was performed using the SPSS/WIN 23 statistical program. There were statistically significant difference in the job stress of medical technician by age, marriage, occupation, hospital size, position, parenting form, employment type, and lunch break. Job stress by occupation was highest in medical laboratory technologists, followed by radiological technologists and physical therapists. Job satisfaction was the highest among physical therapists. followed by radiological technologists and medical laboratory technologists. There were significant differences in age, occupation, parenting form, type of employment, and lunch break according to demographic characteristics. In order to reduce the job stress and job satisfaction of the medical technician working at the hospital, the development of the job environment should be sought and the hospital should also be removed from the authoritarian management system.

• Proceedings of the Korean Society of Radiological Science
• /
• 2004.09a
• /
• pp.75.3-76
• /
• 2004

• Journal of radiological science and technology
• /
• v.16 no.2
• /
• pp.61-72
• /
• 1993

• 대한방사선방어학회:학술대회논문집
• /
• 2010.04a
• /
• pp.166-167
• /
• 2010

• BMB Reports
• /
• v.46 no.5
• /
• pp.258-263
• /
• 2013

In the current study, we explored the effect of LDR on the activation of Nrfs transcription factor involved in cellular redox events. Experiments were carried out utilizing 0.05 and 0.5 Gy X-ray irradiated normal human skin fibroblast HS27 cells. The results showed LDR induced Nrf1 and Nrf2 activation and expression of antioxidant genes HO-1, Mn-SOD, and NQO1. In particular, 0.05 Gy-irradiation increased only Nrf1 activation, but 0.5 Gy induced both Nrf1 and Nrf2 activation. LDR-mediated Nrf1/2 activation was accompanied by reactive species (RS) generation and $Ca^{2+}$ flux. This effect was abolished in the presence of N-acetyl-cysteine and BAPTA- AM. Furthermore, Nrf1/2 activation by LDR was suppressed by PD98059, an inhibitor of ERK1/2. In conclusion, LDR induces Nrf1 and Nrf2 activation and expression of Nrf-regulated antioxidant defense genes through RS and $Ca^{2+}$/ERK1/2 pathways, suggesting new insights into the molecular mechanism underlying the beneficial role of LDR in HS27 cells.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2016.07a
• /
• pp.295-296
• /
• 2016

본 연구에서는 LED 광 자극이 뇌의 어느 영역을 자극하여 신경신호를 전달하는지에 관해서 관찰하고자 연구를 진행하였다. 광 자극에 의한 뇌 영역의 활성변화를 관찰하기 위하여 실험용 소동물과 영상장비인 9.4T MRI를 이용하여 연구를 수행 하였다. 실험용 소동물은 Balb/c 마우스를 이용하였으며 기능적 자기공명영상 획득 방법 중 하나인 에코평면영상 기법을 이용하여 뇌 영상을 획득 하였다. 획득한 영상을 바탕으로 뇌 영역의 자극 정도를 확인해보기 위해 영상처리기법인 재편성(realignment), 일치(co-registration), 표준화(normalization), 평활화(smoothing) 방법으로 영상을 전처리 하고, statistical parametric map (SPM12)을 사용하여 분석하였다. 본 연구에서는 광자극이 소동물 뇌 영역 중 하나인 상구(Superior colliculus)영역과 대뇌의 시각피질 (visual cortex, V1) 영역에서 자극을 일으키는 것을 확인할 수 있었다.

• Journal of the Korean Society of Radiology
• /
• v.2 no.4
• /
• pp.33-40
• /
• 2008

Images acquired by a digital X-ray imaging system are inherently degraded due to system degradation process and additive noise sources. The system degradation in image quality is typically described as the system response function characterized by the modulation transfer function (MTF) and the noise term described as the noise power spectrum (NPS). In this case, we can restore the blur image as close as possible to the original image by using modified filtering designed for digital imaging system, as we know more precisely about the MTF and the NPS. In this paper, by performing simulation, we tried to restore blurred images taken from a digital X-ray imaging system based upon conventional filtering techniques such as a direct-inverse filtering, limited-inverse filtering, or a Wiener filtering, and evaluated the characteristics of the image restoration.