일반엑스선영상검사의 인자에 따른 산란방사선량 평가 및 분석

정동경(Dong-Kyung Jung),박명환(Myeong-Hwan Park),서정민(Jeong-Min Seo) 대한방사선과학회(구 대한방사선기술학회) 2024 방사선기술과학 Vol.47 No.1

Control of scattered radiation is one of very important factors in the use of medical radiation. In general X-ray exam, the causes, measurement methods, and the kind of detectors of scattered rays within the radiation area are diverse. In this study, the dose of scattered ray was measured by changing the thickness of the polycarbonate phantom and the tube voltage. As a result of measurement of scattered radiation, the results show that the scattered dose significantly(p<.05) increased with growing of thickness of phantom in the tube voltage 40, 50 and 60 kVp(F(p)<.05, R2>64%). As tube voltage increased at all phantom thicknesses, the scattered dose also significantly(p<.05) increased(F(p)<.05, R2>69%). In cases where a significant correlation was shown, the coefficient of determination of more than 60% was shown in regression analysis. The results of this study can be used as data on scattered radiation dose according to the tube voltage and the object thickness in general X-ray imaging exam.

핵의학과에서 ^99mTc를 이용한 방사성의약품의 투여율 측정 비교

손상준,박정규,정동경,박명환,Son, Sang-Joon,Park, Jeong-Kyu,Jung, Dong-Kyung,Park, Myeong-Hwan 대한방사선과학회 2020 방사선기술과학 Vol.43 No.2

This study was conducted by SPECT test at the Department of Nuclear Medicine at Daegu P Hospital from June 1 to October 31, 2019. A 3-way injection material was mounted among inpatients, and a syringe that was administered with radiopharmaceuticals using a ^99mTc labeled compound was secured. We tried to find a way to calculate the dose rate of each radiopharmaceutical and increase the dose rate. As a result of measuring the radioactivity of radio-pharmaceuticals using ^99mTc, the average dose rate of 60 syringes of all 6 radiopharmaceuticals was 93.26±7.34%, and the average dose rate of ^99mTc-DMSA was 77.72%, 15.54% lower than the total. As a way to increase the dosing rate, the average dose rate diluted twice with the remaining amount of syringe after administration using normal saline increased to 95.37±6.99%, and the average dose rate diluted three times increased to 96.32±6.86%. The corresponding sample t-test to compare the pre- and post-dose rates at 1 dilution and 2 and 3 dilutions. As a result of the dilution and 2 dilutions, the probability of significance was 0.013, which was significantly higher than the dilution(p<0.05). The probability of significance for dilution 1 and dilution 3 was 0.016, which was significantly higher than in one dilution(p<0.05). The sum of the average dose rate using the experimental 3-way line was the highest with 98.85±1.42% of ^99mTc, ^99mTc-ECD 98.82±1.26%, ^99mTc-Mebrofenin 98.82 ± 1.16%, ^99mTc-HDP 98.74 ± 1.91%, ^99mTc -MIBI was 98.69 ± 1.48%, and ^99mTc-DMSA was the lowest with 86.47 ± 4.74%. When the number of dilutions was 5 times using 0.5 cc of normal saline and when the number of dilutions was 5 times using 1 cc of normal saline, when the number of dilutions was 5 times using 0.5 cc of normal saline and 1 cc of nomal saline When the number of dilutions was 5 times and the syringe volume was 0.5 cc, there was a statistically significant difference (p<0.05). There was a statistically significant difference when the number of dilutions was 5 times using 1 cc of nomal saline and the number of dilutions was 5 times using 1 cc of normal saline, and the syringe volume was 0.5 cc (p<0.05).

Implementation of Radiation Damage in Vitro Model using Swine Skin

정홍문(Hongmoon Jung),원도연(Doyeon Won),정동경(Dong Kyung Jeong),정재은(Jaeeun Jung) 한국방사선학회 2016 한국방사선학회 논문지 Vol.10 No.2

사람 피부 조직에서의 방사선 장해를 연구하는 방법은 실험동물에게 직접적으로 방사선을 노출하여 연구를 수행하게 된다. 이러한 연구방법은 방사선을 실험동물에게 노출시킨 후에 방사선에 의해 손상된 장해조직의 세포를 획득하여 분 석을 하게한다. 이것은 시간적으로나 경제적으로도 많은 손실을 수반하게 된다. 이번 연구는 돼지의 피부를 사람의 피 부로 가정하여 실험하였다. 돼지피부의 두께를 정하여 돼지피부를 통과한 후 피하조직 밑에서 세포가 직접적으로 받을 수 있는 방사선량을 얻어내어 수식화 하였다. 이번연구의 결과에 따르면 피부조직의 방사선 노출 후 피하조직 밑에서 발생되는 방사선량을 유추해낼 수 있다. 더 나아가 동물실험이 아닌 세포만을 가지고도 방사선에 의한 생체장해분석을 할 수 있는 데 효과적으로 사용할 수 있을 것이다. The study of radiation-hazard in the human skin tissue is carried out by direct irradiating to experimental animals. The influences of a radiation to the animal’s skin tissue are analyzed from this experiment. However, this also accompanies losses in terms of both time and economy. In this study, we simulated human tissue by using a swine skin tissue. The depth of the swine skin tissue for the experiment is determined, and the amount of the direct radiation below this skin depth is analyzed numerically. The amount of the radiation occurred by exposure below the skin tissue can be inferred. Moreover, it is possible to use only cells effectively and animal experiments to analyze the body-hazard by radiation.

형광유리선량계의 계측 직선성 연구

정경환(Kyeong-Hwan Jeong),정동경(Dong-Kyung Jung),서정민(Jeong-Min Seo) 한국방사선학회 2021 한국방사선학회 논문지 Vol.15 No.6

방사선을 이용하는 관련 기관은 국내에 연구, 의료, 교육 등 다양하다. 최근에는 검진 및 의료기관의 방문 횟수가 증가하고 있다. 이로 인해 의료기관에서 방사선학적 검사 횟수가 증가하고 있다. 방사선작업종사자의 피폭뿐만 아니라 방사선 안전관리가 필요하다. 안전관리를 위해서 우선적으로 개인피폭선량계의 올바른 착용 및 착용 후 정확한 측정이 필요하다. 본 연구는 진단용 방사선발생장치의 방사선에 의한 PLD 소자의 계측 직선성을 평가하고 검증하려고 한다. 방사선 분할 조사 시간간격은 10, 30, 60 sec로 10회 조사와 거리에 따라 흡수선량 변화를 측정하기 위해서 조사거리를 30 ~ 100 cm까지 10 cm 간격으로 조사 후 측정하였다. 그 결과 시간 간격에 의한 흡수선량은 차이가 없었다. 이는 고흡수선량 연구에 진단용발생장치를 이용하여 다양한 연구에 도움이 될 것으로 여겨진다. Related institutions that use radiation are diverse in Korea, such as research, medical care, and education. Recently, the number of examinations and visits to medical institutions is increasing. As a result, the number of radiological examinations in medical institutions is increasing. Radiation safety management is necessary as well as exposure of radiation workers. For safety management, first of all, it is necessary to wear the personal exposure dosimeter correctly and measure it accurately after wearing it. This study tries to evaluate and verify the measurement straightness of PLD devices by radiation of a diagnostic generator. Radiation division irradiation time interval was measured after irradiating 10 times at 10, 30, and 60 sec and irradiating the irradiation distance from 30 to 100 cm at 10 cm intervals to measure the change in absorbed dose depending on the distance. As a result, there was no difference in absorbed dose by time interval. This is considered to be helpful in various studies by using a diagnostic generator for the study of high absorbed dose.

핵의학과 PET/CT실 방사선작업종사자의 수정체 부위의 등가선량과 흉부의 유효선량의 측정 비교

손상준(Son Sang-Joon),박정규(Park Jeong-Kyu),정동경(Jung Dong-Kyung),박명환(Park Myeong-Hwan) 대한방사선과학회(구 대한방사선기술학회) 2019 방사선기술과학 Vol.42 No.3

Comparison of the effective dose of the chest and the equivalent dose of the lens site in the radiation workers working at four medical institutions with the PET / CT room located in one metropolitan city and province from April 1 to June 30, 2018 Respectively. Radioactive medicine were measured at the time of dispensing and at the time of injection. In this experiment, the average dispensing time per patient was 5.7 minutes and the average injection time was 3.1 minutes. The equivalent dose at the lens site was 0.78 μSv/h for 1 mCi, and the effective dose for chest was 0.18 μ Sv/h per 1 mCi. The equivalent dose at the lens site during injection was 0.88 μSv/h per mCi and the effective dose of chest was 0.20 μSv/h per mCi. The daily effective dose of the chest was 0.9±0.6 μSv and the equivalent dose of the lens site was 3.6±1.4 μSv during daily dosing for 20 days. The effective dose of the chest during the day was 0.6±0.5 μSv and the equivalent dose of the lens was 2.2±1.0 μSv. At the time of dispensing, the equivalent dose of the lens was 0.187±0.035 mSv, the effective dose of the chest was 0.137±0.055 mSv, the equivalent dose of the lens was 0.247±0.057 mSv, and the effective dose of the monthly chest was 0.187±0.021 mSv. As a result of the corresponding sample test, the equivalent dose and the effective dose of the chest, the effective dose of the chest, the effective dose of the chest, the effective dose of the chest, The equivalent dose of the lens and the effective dose of the chest were statistically significant (p<0.05) with a significance of 0.000. However, there was no statistically significant difference (p>0.05) between the equivalent dose and the effective dose of the chest, the equivalent dose of the lens at the time of injection, and the effective dose of the chest at 0.138 and 0.230, respectively.

수술실에서 방사선 차폐기 사용 유무에 따른 공간산란선량분포의 측정

도상록(Do Sang-Lock),조평곤(Cho Pyong-Kon),김성진(Kim Seong-Jin),정동경(Jung Dong Kyung) 대한방사선과학회(구 대한방사선기술학회) 2017 방사선기술과학 Vol.40 No.4

본 연구는 C-arm의 공간산란선량분포를 파악해 보고자, 최근에 개발된 방사선 차폐기의 사용 유무에 따른 공간 산란선량분포를 비교하였다. 수평면 분포는 95 cm 높이에서 환자 머리를 기준으로 반경 50 cm 간격으로 30°씩 증가하였고, 각 수평면의 수직면 내에서 반경 50 cm 간격으로 30°씩 증가하며 측정하였다. 동일한 방법으로 방사선 차폐기를 설치 후 측정하 였다. 측정결과 50 cm 거리 수평면은 0°, 90°, 180° 그리고 270° 방향에서 1.77±0.12, 1.90±0.13, 2.12±0.14, 그리고 2.69±0.15 mSv/h, 방사선 차폐기 사용 후 1.59±0.12, 0.99±0.09, 1.47±0.11, 그리고 1.37±0.11 mSv/h로 나타났다. 또한, 50 cm 거리 수평 방향 90°의 수직 분포는 30°, 60°, 120° 그리고 150°에서 3.85±0.18, 9.15±0.28, 10.82±0.31, 그리고 5.40±0.22 mSv/h, 방사선 차폐기 사용 후 각 각 2.03±0.13, 4.32±0.19, 2.76±0.16, 그리고 1.92±0.13 mSv/h이었다. 방사선 차폐기 사용에 따라 각 방향 모두에서 감소하였다. 따라서 수술실에 근무하는 방사선관계종사자는 공간 산란선량 분포를 정확히 인지하고 적절한 방호 대책으로 피폭의 위해를 방지하는 노력이 필요하다고 사료된다. This study compared the spatial scattered dose distribution according to whether the recently developed radiation shielding is used or not in order to understand the spatial scattered dose distribution of C-arm. The horizontal side distribution increased by 30° in the interval of the radius 50 cm on the height of 95 cm based on the head of the patient, and it was measured by increasing 30° with the interval of 50 cm in the vertical side of each horizontal side. In the same method, the radiation shielding was installed and measured. The result of measurement shows that the horizontal side of 50 cm distance was 0°, 90° and 180°, was 1.77±0.12, 1.90±0.13, 2.12±0.14, and 2.69±0.15 mSv/h in the 270° direction, and was 1.59±0.12, 0.99±0.09, 1.47±0.11, and 1.37±0.11 mSv/h after the use of the radiation shielding. In addition, the verti-cal distribution in horizontal direction 90° with 50 cm distance was 30°, 60°, 120°, was 3.85±0.18, 9.15±0.28, 10.82±0.31, and 5.40±0.22 mSv/h in 150°, and was 2.03±0.13, 4.32±0.19, 2.76±0.16, and 1.92±0.13 mSv/h mR/h after the use of the radiation shielding. Both direction showed decrease according to the use of the radiation shielding. Therefore, radiation re-lated workers who work in operating rooms should recognize the spatial scattered dose distribution exactly and need to try to prevent the risk of radiation exposure with proper protective measures.

핵의학과에서 99mTc를 이용한 방사성의약품의 투여율 측정 비교

손상준(Son Sang-Joon),박정규(Park Jeong-Kyu),정동경(Jung Dong-Kyung),박명환(Park Myeong-Hwan) 대한방사선과학회(구 대한방사선기술학회) 2020 방사선기술과학 Vol.43 No.2

This study was conducted by SPECT test at the Department of Nuclear Medicine at Daegu P Hospital from June 1 to October 31, 2019. A 3-way injection material was mounted among inpatients, and a syringe that was administered with radiopharmaceuticals using a 99mTc labeled compound was secured. We tried to find a way to calculate the dose rate of each radiopharmaceutical and increase the dose rate. As a result of measuring the radioactivity of radiopharmaceuticals using 99mTc, the average dose rate of 60 syringes of all 6 radiopharmaceuticals was 93.26±7.34%, and the average dose rate of 99mTc-DMSA was 77.72%, 15.54% lower than the total. As a way to increase the dosing rate, the average dose rate diluted twice with the remaining amount of syringe after administration using normal saline increased to 95.37±6.99%, and the average dose rate diluted three times increased to 96.32±6.86%. The corresponding sample t-test to compare the pre- and post-dose rates at 1 dilution and 2 and 3 dilutions. As a result of the dilution and 2 dilutions, the probability of significance was 0.013, which was significantly higher than the dilution(p<0.05). The probability of significance for dilution 1 and dilution 3 was 0.016, which was significantly higher than in one dilution(p<0.05). The sum of the average dose rate using the experimental 3-way line was the highest with 98.85±1.42% of 99mTc, 99mTc-ECD 98.82±1.26%, 99mTc-Mebrofenin 98.82 ± 1.16%, 99mTc-HDP 98.74 ± 1.91%, 99mTc -MIBI was 98.69 ± 1.48%, and 99mTc-DMSA was the lowest with 86.47 ± 4.74%. When the number of dilutions was 5 times using 0.5 cc of normal saline and when the number of dilutions was 5 times using 1 cc of normal saline, when the number of dilutions was 5 times using 0.5 cc of normal saline and 1 cc of nomal saline When the number of dilutions was 5 times and the syringe volume was 0.5 cc, there was a statistically significant difference (p<0.05). There was a statistically significant difference when the number of dilutions was 5 times using 1 cc of nomal saline and the number of dilutions was 5 times using 1 cc of normal saline, and the syringe volume was 0.5 cc (p<0.05).