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허재빈,남형우,곽민우,김민성,김광표 (사)한국방사선산업학회 2022 방사선산업학회지 Vol.16 No.1
As the incidence of breast cancer in Korea increases, mammography usage is alsoincreasing. Mean glandular dose (MGD) is used to manage radiation dose in mammography. The MGDis calculated using the MGD conversion factor and measurable radiation quantities. The previouslydeveloped MGD conversion factors require half value layer (HVL) that is difficult to measure in medicalinstitutions when used. Therefore, the object of this study is to derive the MGD conversion factor usingexamination parameter that is easy to obtain, such as tube voltage. In this study, the X-ray spectra of themammography device for each target /filter were calculated to derive the MGD conversion factors. Thebreast computational phantom and the exposure situation in mammography were simulated. The MGDconversion factors were derived using the MCNP6 code, and compared with the previously developedMGD conversion factors to verify the derived MGD conversion factors. In the X-ray spectra for eachtarget/filter derived in this study, the mean energy was high in the order of W/Rh, Mo/Rh, and Mo/Mo atthe same tube voltage. As a result of comparing under the same parameters, the MGD conversion factorswere the highest at W/Rh, followed by Mo/Rh and Mo/Mo. When Mo/Rh and Mo/Mo were compared,the MGD conversion factors of Mo/Rh were higher in the all tube voltage. For all targets /filters, theMGD conversion factors increased as the tube voltage increased at the same glandularity, and theMGD conversion factors decreased as the compressed breast thickness increased. Compared to theMGD conversion factors of Dance and Wu, the differences were 8.9% and 6.8%, respectively. The MGDconversion factors developed in this study will contribute to the reduction of radiation doses resultingfrom mammography through use in managing radiation doses resulting from mammography at medicalinstitutions that are difficult to measure HVL.
국내 유방촬영 방사선량 평가 및 국내·외 진단참고수준 조사 분석
남형우,허재빈,이민영,라현준,김광표 한국방사선산업학회 2021 방사선산업학회지 Vol.15 No.3
Mammography is an important medical tool used to diagnose breast cancer. The usageof mammography is continuously increasing due to the development of the medical industry inKorea. The glandular tissue which is sensitive to radiation is exposed during mammography, so itis necessary to manage the patient dose for mammography. Therefore, the objective of this studyis to evaluate the radiation dose for mammography and to investigate and analyze domestic andforeign diagnostic reference levels. In this study, radiation dose assessment methodology based onMonte-Carlo was established for the evaluation of patient radiation dose by mammography. Thestudies on the diagnostic reference level of countries and associations such as the United States,Australia, Spain, Ireland, Bulgaria, and Slovenia were investigated. In Korea, the studies on themammography diagnostic reference level conducted by the Ministry of Food and Drug Safety(MFDS) and the Korea Centers for Disease Control and Prevention (KCDC) were investigated. As a result of evaluating the mean glandular dose and effective dose by mammography usingthe MCNP program, the mean glandular dose and effective dose for the compression breastthickness range of 4~5 cm which is largest number of patients in Korea were 1.36 mGy, 0.163mSv and 1.34 mGy, 0.161 mSv for CC and MLO. In a study conducted by the KCDC in 2018,the mammography diagnostic reference level for phantom and patient was established. Thediagnostic reference level for phantom was 1.59 mGy, which was 14% and 18% higher thanKorea in 2007 and Australia, and 26%, 45%, 7% lower than US, Bulgaria, and Slovenia. Thediagnostic reference level for patient was 1.97 and 1.98 mGy in the CC and MLO, similar to Spainand higher than other countries and associations. The result of patient radiation dose evaluationfor mammography and domestic and foreign diagnostic reference level analysis conducted in thisstudy can be used as basic data for reducing patient dose by mammography in Korea.