• 대한방사선기술학회지:방사선기술과학
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• 제30권3호
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• pp.213-219
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• 2007

중재적 시술의 시술자를 대상으로 방사선 방호용구의 안과 밖의 실제 방사선량을 측정하여 이를 바탕으로 방사선 방호용구의 방사선 차폐율을 비교 분석하는 것이다. 2005년 5월부터 9월까지 중재적 시술 중에서 시행 빈도가 높은 TACE, PTBD를 시행하는 중재적 시술자 4인에게 방사선 방호용구의 착용 시 피폭선량 감쇄효과를 측정하기 위해 각 신체부위별 방호용구 안과 밖에 TLD를 부착하여 피폭선량을 측정하였다. TLD 부착부위는 Goggle inside, Goggle outside, Thyroid protector inside, Thyroid protector outside, Apron inside(waist level), Apron outside(upper chest level), Hand 4th finger(ring type TLD)와 환경방사선을 측정하기 위해 TLD 10개를 Control room 여러 곳에 위치시켰다. TACE 검사시 0.07 mmPb Goggle의 사용으로 연속투시방식에서는 평균 53.8%의 선량율감쇄를 보였으며 펄스투시방식에서는 77.6%의 감쇄효과를 보였고, 0.5 mmPb Thyroid protector의 사용에서는 연속투시방식에서는 평균 88.9%의 선량율감쇄를 보였으며 펄스투시방식에서는 92.8%로 선량율감쇄에서는 유의한 차이가 없었다. PTBD 검사시 0.07 mmPb Goggle의 사용으로 평균 62.7%의 선량율감쇄를 보였으며, 0.5 mmPb Thyroid protector의 사용에서는 평균 89.1% 선량율이 감쇄 되었고 0.5 mmPb Apron의 사용에서도 평균 87.9%의 감쇄효과가 있었다. PTBD 시술은 TACE 시술에 비해 평균 투시시간은 6.14 min이나 적었으나 피폭선량은 체부에서 약 3배, 손에서는 40배 이상 피폭되었다. 납당량이 두꺼운 방호용구를 착용하거나 최소한 권고되어지는 0.5 mmPb 이상의 것을 착용하여야 하며, 시술시 눈을 보호하는 Goggle의 착용을 생활화해야 한다. 테이블 아래쪽에 납커튼을 장착하면 복부의 피폭선량율은 평균 38.4% 감쇄하므로 납커튼을 장착하여 산란선을 차폐하여야 한다. 펄스투시방식을 이용하면 연속투시에 비해 피폭선량율이 평균 59.0% 감쇄되므로 연속투시보다 펄스투시방식을 선택하여 피폭선량을 감소시켜야 한다.

• Journal of Radiation Protection and Research
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• 제39권4호
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• pp.182-186
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• 2014

Recently, the use of panoramic radiography has shown a constant increase, and significant research is underway. However, radiation exposure attracts less attention in dental radiography than in other types of radiography. We used an OSLD for measurement of the entrance skin dose in eyeballs and the thyroid region, both of which are not covered by examinations but are included in radiographical regions and are sensitive to radiation, as well as orally in Incheon and reported the results. The entrance skin dose was 0.0282 mSv on average for the oral region, and 0.0259 mSv on average for the eyeball, and 0.0261mSv on average, for thyroid gland. While there is no proper shielding method for the eyeball, a thyroid protector is not used by most hospitals and most hospitals are equipped with an apron and a thyroid protector separately; thus, it is necessary to use an integration of an apron and a thyroid protector and medical device manufacturers need to develop a method for controlling the length of the slit in the slit-type area of radiation occurrence in order to reduce unnecessary exposure.

• The Korean Journal of Pain
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• 제33권1호
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• pp.73-80
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• 2020

Background: The aim of this study was to evaluate radiation exposure to the eye and thyroid in pain physicians during the fluoroscopy-guided cervical epidural block (CEB). Methods: Two pain physicians (a fellow and a professor) who regularly performed C-arm fluoroscopy-guided CEBs were included. Seven dosimeters were used to measure radiation exposure, five of which were placed on the physician (forehead, inside and outside of the thyroid protector, and inside and outside of the lead apron) and two were used as controls. Patient age, sex, height, and weight were noted, as were radiation exposure time, absorbed radiation dose, and distance from the X-ray field center to the physician. Results: One hundred CEB procedures using C-arm fluoroscopy were performed on comparable patients. Only the distance from the X-ray field center to the physician was significantly different between the two physicians (fellow: 37.5 ± 2.1 cm, professor: 41.2 ± 3.6 cm, P = 0.03). The use of lead-based protection effectively decreased the absorbed radiation dose by up to 35%. Conclusions: Although there was no difference in radiation exposure between the professor and the fellow, there was a difference in the distance from the X-ray field during the CEBs. Further, radiation exposure can be minimized if proper protection (thyroid protector, leaded apron, and eyewear) is used, even if the distance between the X-ray beam and the pain physician is small. Damage from frequent, low-dose radiation exposure is not yet fully understood. Therefore, safety measures, including lead-based protection, should always be enforced.

• 한국방사선학회논문지
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• 제13권3호
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• pp.459-464
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• 2019

치과 콘빔 전산화단층 검사 시 갑상선 부위의 방사선 피폭선량을 최소화하기 위하여 보루스 (Bolus)를 이용한 차폐체를 제작하고, 방사선 차폐 효과와 영상의 적정성을 평가하였다. 치과용 콘빔 전산화단층검사장비를 사용하여 치과방사선 두부 팬텀을 대상으로 갑상선의 좌, 우측 부위에 유리선량계를 부착시켜 방사선량을 측정하였다. 차폐체의 두께를 각각 10 mm, 20 mm, 30 mm로 다르게 하여 각 차폐체별로 흡수선량을 측정하여 차폐체를 사용하지 않았을 경우와 비교하였다. 8명의 평가자가 진료영상의 적정성을 여부를 평가하였다. 왼쪽 갑상선 부위에 30 mm Bolus 차폐체를 사용한 경우에는 결과값이 평균 $342.67{\mu}Gy$로 Bolus 차폐체를 사용하지 않고 측정한 결과값의 평균 $431.22{\mu}Gy$보다 20.7% 감소하였고, 오른쪽 갑상선 부위에 30 mm Bolus 차폐체를 사용한 경우에는 평균 $424.56{\mu}Gy$로 21.9%의 선량감소효과를 보였다. 진료 영상의 적정성은 평가자 모두 사용 가능하다 판단하였다. 결론적으로, 치과 콘빔 전산화단층검사 시 갑상선 부위의 방사선 피폭선량을 최소화하기 위해 제작된 Bolus 차폐체는 장해음영 없이 적정한 진단 영상 처리가 가능하고, 방사선차폐 효과가 있어 유용한 차폐체로 적용 가능할 것으로 사료된다.

• 대한방사선기술학회지:방사선기술과학
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• 제41권2호
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• pp.97-102
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• 2018

The purpose of this study is to provide the basic data for reducing unnecessary radiation dose to the abdomen and fetus of pregnant women by presenting proper height of shielding protector for efficient abdominal shielding in chest PA examination of Korean pregnant women. The subjects of this study were 288 persons who were eligible for this study among 798 pregnant women who had chest PA examination from January 1, 2015 to December 31, 2016 Retrospective study was performed. Measurements was performed from the apex of the right and left lungs to costophrenic angle of the right and left lungs and to the lowest costophrenic angle among the right and left lungs at the top of the image(this line called Joo's line in this study). The mean of the right and left lung height of pregnant women were 259.09 mm and 263.57 mm, respectively. Also, the average height of the Joo's line designed by the researcher for proper abdominal radiation protection was 322.15 mm. For proper and efficient abdominal radiation protection for pregnant women, it is necessary to adjust the shielding according to the height of the pregnant woman. It is appropriate that the height of the shielding protector should be adjusted so that the upper part of the shield is located at 342.30 mm below from upper part of the detector.

• 대한디지털의료영상학회논문지
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• 제11권2호
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• pp.85-92
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• 2009

This study, "The study about performance evaluations of mobile cover for X-ray's diffusion and distribution in mobile radiation" is based on the rules of mobile defense apparatus for radiation producer in 2006. To use the mobile cover for X-ray for diagnosis has been compulsory in common wards except operation rooms, emergency rooms and intensive care units. we have confirmed the effect in arbitrary shielding material after Qualitiy Control was carried out for accuracy in an experiment of mobile photographing equipment. The performance evaluation was conducted with the fabrics of selenium, 0.2 mmPb, 0.1 mmPb and aluminiums. Considering the result, we choosed 0.1 mmPb and attached cover to mobile photographing equipment. We have finished making the cover after drew up the draft to attach cover to mobile photographing equipment through the modeling and the structural analysis. the process of the study is that we assembled the manufactured structures and carried out the practical experiment to take the photograph after attaching the fabric of 0.1 mmPb to mobile photographing equipment. It is need of additional thesises hereafter that we compare the result between the part to improve for safety besides convenience in photographic experiment about clinical radiation and the effect of covering the diffusion in condition attached the cover.

• 대한방사선기술학회지:방사선기술과학
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• 제41권3호
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• pp.255-260
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• 2018

Most patients and parents and guardians display frequent anxiety due to radiation exposure during outpatient, ward, and pediatric general radiographic examinations. This is a behavior that perceives only the harmfulness of radiation. For the recognition of medical radiation, we conduct surveys on outpatients, inpatients, and pediatric parents and guardians to identify their awareness, and then use the radiation dose promotional materials After providing accurate information on the use of radiation, the outpatient, inpatient, and pediatric parents and guardians were asked to explain the change in awareness. The questionnaire items were classified into five categories: repetitive radiation awareness for diagnosis, awareness of exposure dose, availability of exposure information, awareness of radiation risk, and awareness of health problems caused by radiation. There was a statistically significant difference in the items of recognition result of medical radiation, although there was a slight difference in the individual items in the pre and post-recognition results of providing information about the radiologists of the protector and the outpatient(p<0.05). Therefore, through the installation of these promotional materials, we will improve our awareness of medical radiation safety during general radiography surveillance in the Department of Radiology to provide better quality medical information and medical services, thereby contributing to strengthening the competitiveness of the hospital.

• 대한방사선기술학회지:방사선기술과학
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• 제35권3호
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• pp.219-226
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• 2012

방사선 중재적 시술자들이 중재적 시술 중 잠재적인 위험을 인식하지 못하고 있다. 본 연구의 목적은 방사선 중재적 시술 중 시술자들의 피폭선량을 평가하여 이를 바탕으로 중재적 시술 중 피폭선량을 줄일 수 있는 방법의 기준안을 제안하는 것이다. 본 연구는 3개월 동안 전신선량계를 사용하여 20명의 중재적 시술자로부터 시행하는 모든 중재적 시술에서 방사선 피폭선량을 측정하였다. 방사선 중재적 시술을 시행하는 동안 납당량이 0.5 mmPb 방사선장해방어용 기구를 착용하는 것으로 평균 89.5 %의 피폭선량이 감쇄되었고, 납당량이 두꺼울수록 선량감쇄율은 증가하였다. TACE 시술을 시행하는 동안 연속투시보다 펄스투시를 선택하여 사용하는 것은 피폭선량이 평균 47.7 % 감쇄되었다. 중재적 시술자는 중재적 시술이 진행되는 동안 방사선장해방어용 기구를 착용하고, 적극적인 방사선방호 활동을 실시하여야 하며, 자신의 피폭선량에 대해 알고 있어야 한다. 그리고 피폭선량을 최소화하기 위한 자신의 위치나 장비 사용에 대해서도 알아야 한다.

• Journal of Radiation Protection and Research
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• 제21권2호
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• pp.99-105
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• 1996

림프구와 림프종에 고준위 방사선(8Gy)을 조사했을 때. 저준위 방사선을 먼저 조사한 경우 세포 생존률이 3.7배 증가하는 것이 관찰되었다 세포 생존률은 고준위 방사선 조사로 발생되는 산소 라디칼의 제거. 변성된 유전자와 단백질의 제거, 변화된 세포의 제거 등으로 증가할 수 있다. 본 연구에서는 저준위 방사선 조사로 유도되는 방사선 저항기전을 알아보기 위하여, 고준위 방사선 조사시 발생되는 산소 라디칼을 제거하는 효소들의 활성과 방사선 보호제로 알려진 glutathione의 양을 측정하였다 림프종의 경우 저준위 방사선 조사시 peroxidase의 활성이 133.3%로 증가하였다. 림프구의 경우는 superoxide dismutase, glucose-6-phoshpate dehydrogenase와 glutathione의 활성이 각각 138.5%. 122.4%. 120.8%로 증가하였으며. 이들 효소들의 활성은 저 준위방사선 조사 간격이 7 시간일 때 가장 증가되었다.

• 한국전기전자재료학회논문지
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• 제23권10호
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• pp.826-830
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• 2010

This study examined the effect of the scattering dose on the thyroid during a mammography examination. One hundred subjects for a mammography examination were enrolled in this study. The average glandular dose (AGD) and thyroid scattering dose (TSD) were measured. Statistical analysis was carried out using the percentage, t-test and co-variance. The mean radiation exposure to the breast and thyroid was $1.08{\pm}0.16$ and $0.14{\pm}0.04$ mGy, respectively. The percentage TSD to the AGD was 31.19%. There was no difference between the Rt. and Lt., and CC to MLO, and radiation dose to the TSD was 13.78% of the breast. Therefore, the volume of radiation exposure to the thyroid was 54.12% in a single routine mammography examination. These results suggest that the TSD was increased by increasing radiation dose to the breast. A thyroid protector is considered necessary to decrease the level of radiation exposure.