• Title, Summary, Keyword: 방사선 노출

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The Evaluation of Radiation Dose by Exposure Method in Digital Magnification Mammography (디지털 유방확대촬영술에서 노출방식에 따른 피폭선량 평가)

  • Kim, Mi-Young;Kim, Hwa-Sun
    • Journal of radiological science and technology
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    • v.35 no.4
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    • pp.293-298
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    • 2012
  • In digital mammography, Exposure factor were automatically chosen using by measurement breast thickness and the density of mammary gland. It may cause a increase glandular dose. The purpose of this study was to investigate optimal image quality in digital magnification mammography to decrease radiation exposure of patient dose. Auto mode gives the best image quality however, AGD showed better image quality. Image quality of manual mode passed phantom test and SNR at 55% mAs of auto mode commonly used in the digital magnification mammography. Also it could reduce AGD. According to result, manual mode may reduce the unnecessary radiation exposure in digital magnification mammography.

Efficacy of Automatic Dispensing/Injection System to Reduce Radiation Exposure of Nuclear Medicine Workers During PET Procedures (PET 검사에서 작업종사자의 방사선 노출 선량을 줄이기 위한 자동 분주/주사 시스템의 유용성)

  • Cho, Young-Kwon
    • The Journal of the Korea Contents Association
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    • v.14 no.8
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    • pp.220-224
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    • 2014
  • In this study we assessed the efficacy of an automatic dispensing/injection system (ADIS) to reduce the radiation exposure of workers during PET procedures. NMW(Nuclear Medicine Workers) were classified into 2 groups, one of which used conventional method and the other used an ADIS. The radiation dose during injection were also measured in both groups, with another set of experiment. In dispensing step, ADIS imposed significantly less radiation dose than conventional method, both to finger and to whole body. In injection step, ADIS also imposed significantly less dose to finger, while the dose of whole body was somewhat larger in ADIS than in conventional method. Using ADIS, the radiation exposure of NMW during dispensing was markedly reduced. Also, the exposure of finger during injection was markedly reduced, although exposure of whole body was mildly increased.

A Cohort Study on Cancer Risk by Low-Dose Radiation Exposure among Radiation Workers of Nuclear Power Plants in Korea (저준위 방사선 노출의 암 유발에 관한 국내 원전종사자 코호트 연구)

  • Lim, Young-Khi;Yoo, Keun-Young
    • Journal of Radiation Protection and Research
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    • v.31 no.2
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    • pp.53-63
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    • 2006
  • The increased risk of cancer with exposure to low-dose radiation was estimated through longitudinal study for radiation workers at the nuclear power plants in Korea. The radiation dose data were collected from the Radiation Safety Management System(RSMS) of the Korea Hydro & Nuclear Power Co., Ltd(KHNP). The cancer risks with radiation exposure were evaluated in terms of relative mortality ratios(RMR) and relative incidence ratios(RIR) to the unexposed employees at the nuclear power plants, and of the standardized mortality ratios(SMR) and standardized incidence ratios(SIR). There were no significant increases of canters of all sites in the exposed group either in RIR[1.08, 95% confidence interval(CI) 0.74-1.58] or in RMR[1.21, CI 0.70-2.08]. Neither SIR[0.81, CI 0.28-0.96] nor SMR[0.86, CI 0.66-1.10] significantly deviated from 1.0 for cancers of all sites. The trend analysis did not identify evident dose-response relationship due to insufficient numbers of the cases. Consequently, it is concluded that increases in cancer risks in the radiation worker group exposed to low doses at the nuclear power plants in Korea are not identified at this time.

Paper Operration room nurses Experience in Using Radiation Suegery: Phenomenological Research (수술실 간호사의 방사선 노출 경험: 현상학적 연구)

  • Yun, Jae-Hyeon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.1
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    • pp.426-438
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    • 2020
  • This study aimed to identify the components of the nurses' exposure experiences and clarify the semantic structure of nurses by analyzing the participants' experiences of exposure to radiation. The participants in this study were nine nurses who worked for at least six months in the operating room of a City General Hospital. The data were collected using in-depth interviews and analyzed using the phenomenological method by Giorgi's (2004). As a result, six components were derived: "worrying about the disease by repeated radiation exposures", "exhausting physically and mentally," "trying to protect themselves against radiation exposure", "feeling of internal confusion and conflict", "demanding improvement of work environment", and "accepting and adapting to reality". In conclusion, nurses participating in radiation exposure surgery are concerned about the possibility of disease, experience physical and mental fatigue, and then consider changing their occupation. On the other hand, they try to accept and adapt to reality by considering the possibility of a job change or trying to protect themselves from the harsh environment. To develop a radiologically safe environment, systematic and effective resolutions must be secured at the organizational level.

System Software Design of Computed Tomography Radiation Dose Management (컴퓨터 단층촬영(CT) 방사선 노출 관리 시스템 소프트웨어 설계)

  • Yang, Yu-mi;Lee, Kil-hung;Cho, Sang-wook
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.489-492
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    • 2014
  • This thesis provides the design of system software for the management of radiation dose that is generated using computer tomography(CT). Because radiation exposure is different depending on the difference in sensitivity to each part for each of the patient's body, if we will be able to manage an appropriate amount of radiation, it is possible to estimate the radiation exposure of the patient as a result. Recently, radiation leakage incident of Japanese nuclear power plant was in the news internationally and there is a growing interest not only a nuclear power plant, to medical radiation exposure. In spite of the fact that currently safety management of radiation is under control only the workers of the radiation involved, exposure management of patients until now have been required. Surgery and inspection using the radiation in Korea will increase, due to this medical exposure has increased, but it is a reality that medical institution don't know the level of radiation exposure applied to the patient. Therefore a system for managing the radiation exposure of the patient from the medical institution is required. This paper proposes a design of a software program to manage the radiation exposure of CT is an typical imaging tool to use the radiation in the medical institution. By check the amount of radiation dose and set the limit of dose, we would help to optimize the medical exposure of the patient.

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PECTORALIS MAJOR MYOCUTANEOUS FLAP FOR THE COMPLICATIONS OF POSTIRRADIATION HEAD & NECK CANCER SURGERY (방사선 치료후 두경부암 수술의 합병증에 대한 Pectoralis Major Myocutaneous Flap의 이용)

  • 송달원;백재한;김중강
    • Proceedings of the KOR-BRONCHOESO Conference
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    • pp.19.2-19
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    • 1987
  • 방사선치료후 재발성 또는 잔존성 두경부암의 수술후에 피부판의 괴사 및 slough, 감염, 누공, 부종과 경동맥 노출 심지어는 경동맥 파열 등의 술후 합병증이 빈발함으로 수술에 큰 어려움을 겪게 된다. Pectoralis major myocutaneous flap은 진행된 두경부암의 광범위한 절제후에 그 결손부를 보충해 주는 데 좋은 방법으로 사용할 수 있을 뿐아니라 방사선치료후에 생긴 합병증에도 이 flap을 이용하여 좋은 치료결과를 얻을 수 있다. 저자들은 수술 전에 방사선치료를 받고 심한 부종으로 후두조직의 괴사 및 기능이 손실된 환자와 방사선 치료후 재발된 상인두암환자의 경우에서 수술 후 생긴 pharyngocutaneous fistula와 피부판감염 및 경동맥노출 등으로 치유가 곤란하여 여기에 pectoralis major myocutaneous flap을 사용하여 pharyngostoma를 재건하고 노출된 경동맥부위를 보호하여 좋은 치료효과를 얻었기에 문헌을 고찰하여 보고하는 바이다.

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Evaluation of the Usefulness for Air Gap Technique in Digital Magnification Mammography (디지털 유방확대촬영술에서 Air gap technique의 유용성 평가)

  • Kim, Mi-Young
    • Journal of radiological science and technology
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    • v.37 no.2
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    • pp.101-107
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    • 2014
  • The purpose of this study was investigated optimal exposure condition in digital magnification mammography to decrease radiation dose and increase image quality of the examinee. Auto mode, the average glandular dose is higher than the manual mode. Average glandular dose and image quality were many differences on between grid and air gap technique in auto mode. However, Average glandular dose and signal-to-noise ratio were not different on between grid and air gap technique in manual mode. The signal-to-noise ratio was increased when using the air-gap technique in both mode. According to result, air gap technique may reduce average glandular dose and increase signal-to-noise ratio in digital magnification mammography.

The Study for Radio Protection According to a Possible Danger of Exposure During low energy X-ray Examination (저 에너지 방사선 검사 시 노출 위험성에 따른 피폭선량 방어연구)

  • Lim, Cheong-Hwan;Jeong, Cheon-Soo
    • Proceedings of the Korea Contents Association Conference
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    • pp.187-188
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    • 2011
  • 저 에너지 방사선검사 시 부득이하게 방사선 노출을 받게 되는 방사선 작업종사자나 환자의 보호자가 위치와 거리에 따른 방사선 피폭 선량의 감소 방안을 알아보고자 한다. Ion chamber mode 2026c, Reader기 20X6-1800을 사용하여 구강내 검사와 구강외 검사의 각각 검사실과 조정실에서의 관전압의 변화, 관전류와 조사시간의 변화, 조사방향의 변화에 따라 선량을 측정하였다. 그 결과 검사실 안에서는 최고선량이 평균 $702.8{\mu}R$으로 측정 되었으며, 조정실 안에서 측정하였을 경우 $20{\mu}R$이하의 낮은 선량을 보였으며, 후방검사보다 측방검사가 낮은 선량으로 나타났다. 방사선검사 시 위치와 거리에 따른 조사선량을 비교 분석하여, 적절한 거리 확보와 조사되는 중심방사선을 기준으로 측방($90{\sim}135^{\circ}$)에 위치함으로써 방사선 방어에 도움을 줄 것이며, 차폐문을 이용하여 방사선 피폭으로부터 감소 효과를 볼 수 있을 것이다.

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