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Rah, Jeong-Eun,Shin, Dongho,Oh, Do Hoon,Kim, Tae Hyun,Kim, Gwe-Ya Published for the American Association of Physicis 2014 Medical physics Vol.41 No.9
<P>To evaluate and improve the reliability of proton quality assurance (QA) processes and, to provide an optimal customized tolerance level using the statistical process control (SPC) methodology.</P>
Rah, Jeong-Eun,Kim, Gwe-Ya,Oh, Do Hoon,Kim, Tae Hyun,Kim, Jong Won,Kim, Dae Yong,Park, Sung Yong,Shin, Dongho BioMed Central 2016 Radiation oncology Vol.11 No.-
<P><B>Background</B></P><P>The purpose of this study is to evaluate the dosimetric benefits of a proton arc technique for treating tumors of the para-aortic lymph nodes (PALN).</P><P><B>Method</B></P><P>In nine patients, a proton arc therapy (PAT) technique was compared with intensity modulated radiation therapy (IMRT) and proton beam therapy (PBT) techniques with respect to the planning target volume (PTV) and organs at risk (OAR). PTV coverage, conformity index (CI), homogeneity index (HI) and OAR doses were compared. Organ-specific radiation induced cancer risks were estimated by applying organ equivalent dose (OED) and normal tissue complication probability (NTCP).</P><P><B>Results</B></P><P>The PAT techniques showed better PTV coverage than IMRT and PBT plans. The CI obtained with PAT was 1.19 ± 0.02, which was significantly better than that for the IMRT techniques. The HI was lowest for the PAT plan and highest for IMRT. The dose to the OARs was always below the acceptable limits and comparable for all three techniques. OED results calculated based on a plateau dose–response model showed that the risk of secondary cancers in organs was much higher when IMRT or PBT were employed than when PAT was used. NTCPs of PAT to the stomach (0.29 %), small bowel (0.69 %) and liver (0.38 %) were substantially lower than those of IMRT and PBT.</P><P><B>Conclusion</B></P><P>This study demonstrates that there is a potential role for PAT as a commercialized instrument in the future to proton therapy.</P>
라정은(Jeong Eun Rah),홍주영(Ju Young Hong),김귀야(Gwe Ya Kim),임천일(Chun il Lim),정희교(Hee Kyo Jeong),신동오(Dong Oh Shin),서태석(Tea Suk Suh) 대한방사선종양학회 2006 Radiation Oncology Journal Vol.24 No.2
목 적: 식품의약품안전청(Korea Food Drug Administration, KFDA)의 도움을 받아 1998년부터 2004년까지 장기 간에 걸친 교정정수의 분석을 통해 원통형이온함의 모델별 안정성을 확인하고자 한다. 대상 및 방법: 치료방사선기관에서 교정을 의뢰한 이온함 중 Farmer형의 원통형이온함만을 대상으로 하였으며 모델은 PTW사의 30001 (30006), 30013, 30002, 30004, 23333과 Capintec사의 PR06C, NE사의 2571, Exradin사의 A12 그리고 Wellhofer사의 FC65G (IC70) 등 총 9개 종류의 이온함에 대해 에어커마 교정정수 및 물흡수 선량 교정정수를 분석하였으며 에어커마 교정정수를 이용하여 계산한 물흡수선량 교정정수(cal. ND,W)와 실제측정에 의해 결정된 물흡수선량 교정정수(mea. ND,W)를 상호 비교하였다. 결 과: 교정정수 변화를 분석해 본 결과, PTW사의 30013 (30006), Wellhofer사의 FC65G (IC70) 그리고 NE사의 2571 이온함의 경우 측정 표준편차 0.2% 이내에서 잘 일치하여 다른 모델의 이온함에 비해 안정된 값을 가지는 것으로 나타났으며 계산에 의한 물흡수선량 교정정수와 실제 측정에 의해 결정된 물흡수선량 교정정수를 비교 분석한 결과는 모든 이온함에서 측정에 의한 물흡수선량 교정정수가 약 1.0% 큰 것으로 나타났다.결 론: 본 연구에서는 원통형이온함의 교정정수 값들에 대하여 장기간의 안정성 평가를 토대로 임상에서 요구되는 이온함의 선택 기준을 제시함으로써 표준체계에 따른 이온함의 선택 및 선량측정의 정확성을 향상시킬 것으로 기대한다. Purpose: To analyze the long-term stability of Farmer-type cylindrical ionization chambers by calibration factor provided from the KFDA (Korea Food Drug Administration) Materials and Methods: The cylindrical ionization chambers used in this study were the PTW 30001 (30006), 30013, 30002, 30004, 23333, the Capintec PR06C, the NE 2571, the Exradin A12 and the Wellhofer FC65G (IC70). We were analyzed that the Nk and ND,W calibration factor for the cylindrical chambers and compared between the measured ND,W and calculated ND,W calibration factor. Results: We have observed that the long-term stability of the PTW 30013 (30006), the Wellhofer FC65G (IC70) and the NE 2571 has varied within 0.2%. The measured ND,W calibration factor was about 1.0% higher than the calculated ND,W that determined by the Nk calibration factor. Conclusion: The study has evaluated that the long-term stability of the cylindrical chambers through analysis for the Nk and ND,W calibration factor. It has contributed to the improvement of clinical electron dosimetry in radiotherapy centers.
Tolerance design of patient‐specific range qa using the dmaic framework in proton therapy
Rah, Jeong‐,Eun,Shin, Dongho,Manger, Ryan P.,Kim, Tae Hyun,Oh, Do Hoon,Kim, Dae Yong,Kim, Gwe‐,Ya Published for the American Association of Physicis 2018 Medical physics Vol.45 No.2
<P>Conclusion: DMAIC framework can be used to provide an effective QA by setting customized tolerances. When tolerance design is customized, the quality is reasonably balanced with time and cost demands. (c) 2017 American Association of Physicists in Medicine</P>
노인장기요양 등급외자의 등급 내 진입속도와 진입 영향 요인에 대한 종단적 연구
한은정(Eun Jeong Han),박영우(Yeong Woo Park),송미경(Mi Kyung Song),황라일(Rah Il Hwang) 한국노인간호학회 2022 노인간호학회지 Vol.24 No.4
Purpose: The purpose of this study is to identify the progress of transition from the non-graded to the approved for Long-term Care Insurance (LTCI) and analyze the factors affecting becoming beneficiaries. Methods: This study was designed as a prospective cohort study. Study population was the non-graded for LTCI in 2018. We tracked and observed study population until December 2020 by using big data. Variables in the analysis consisted of the individual (socioeconomic characteristics, health status, medical service usage) and community-related (physical environment, local infrastructure, local older population, local social capacity, health policy) factors. Competing risks regression analysis was used to identify determinants of transition from the non-graded to beneficiaries for LTCI. Results: We analyzed 52,308 non-graded for LTC insurance. The average period of transition from the non-graded to beneficiaries was about 15.61 months, the cumulative transition rate for 6 months was 4.8%, and the cumulative transition rate for 36 months was 49.6%. The individual factors (higher age, female, low income, lower daily living ability, lower cognitive-behavioral score, dementia, low back pain, and lower medical expenses), as well as the community factors (rural areas) were determinants for the transition to beneficiaries. Conclusion: To prevent non-graded from being persons with LTC needs, we suggested that it is necessary to develop a policy that can establish an integrated community-based support system by selecting vulnerable groups such as rural residents and low-income groups. In addition, additional research is needed to evaluate the effect of preventive programs for the non-graded on maintaining and improving their health and functional status.
Measurement of proton beam range by using scintillating fiber optic dosimeter
Ui-Jung Hwang,Hojin Jeong,Jeong-Eun Rah,Seung Hoon Yoo,Byung Jun Min,Sang-Yeob Lee,Myonggeun Yoon,Dong Ho Shin,Se Byeong Lee,Sung Yong Park,Kyong Won Jang,DongHyun Cho,Bongsoo Lee 대한방사선방어학회 2010 대한방사선방어학회 학술발표회 논문요약집 Vol.2010 No.11
Yoo Denis,Kim Jeong-Yub,Min Byung Jun,Rah C. J.,Lee Eric,Jang Won-Il,Kim Eun Ho 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.6
This paper presents results from a parameter study on calculating the oxygen enhancement ratio (OER) for carbon ion beams by making use of three types of models. Comparison to photon or proton beam therapy, carbon beam therapy has been noticed to have a relatively low OER. This study investigates the calculation of the OER using the number of fractionation and the linear energy transfer (LET). The results are then evaluated via the universal survival curve (USC), the repairableconditionally repairable (RCR), and the linear quadratic (LQ) models. This model study also measured the cell survival ratios (experimental measurement). To make the calculation, we took the local oxygen change (LOC) case and the static case into consideration. According to the findings, in terms of a carbon beam, the OER is not so low to such an extent that OERs need to be a consideration for calculating the treatment planning system (TPS) for carbon beam therapy. Moreover, the study investigates the fraction dose-dependency of the OER effect. In regard to the LOC conditions, an increase of 17.6% is observed during a 3.5 Gy dose variation.