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소프트웨어 기반 정도관리 시스템을 이용한 부피세기조절회전치료 환자 별 정도관리의 유용성 평가
강동진(Dong-Jin Kang),정재용(Jae-Yong Jung),신영주(Young-Joo Shin),민정환(Jung-Whan Min),김연래(Yon-Lae Kim),권경태(Kyung-Tae Kwon) 대한방사선과학회(구 대한방사선기술학회) 2018 방사선기술과학 Vol.41 No.1
The purpose of this study is to evaluate the usefulness of a software-based quality assurance system based on Volumetric Modulated Arc Therapy treatment plan. Evaluate treatment plan through the D VH analysis, PTV mean dose ( ) and PTV 95% dose( ) compare the MFX based on original treatment plan, Average error rate was 0.9±0.6%, 1.0±0.8%, respectively. Measuring point dose using phantom and ion chamber, the average error rate between the ionization chamber and MFX was 0.9±0.7%, 1.1±0.7% (high dose region), 1.1±0.9%, 1.2±0.7% (low dose region). The average gamma though of MFX and Delta 4PT is 98.7±1.2%, 98.4±1.3%, respectively. Through this study, A software based QA system that simplifies hardware based QA procedures that involve a lot of time and effort. It can be used as a simple and useful tool in clinical practice.
척추 방사선수술 시 다엽콜리메이터 위치 오차의 임상적 위험성 평가
강동진(Dong‑Jin Kang),오건(Geon Oh),신영주(Young‑Joo Shin),강진규(Jin-Kyu Kang),정재용(Jae-Yong Jung),이보람(Boram Lee) 대한방사선과학회(구 대한방사선기술학회) 2023 방사선기술과학 Vol.46 No.6
The purpose of this study is to evaluate the clinical risk of spinal radiosurgery by calculating the dose difference due to dose calculation algorithm and multi-leaf collimator positioning error. The images acquired by the CT simulator were recalculated by correcting the multi-leaf collimator position in the dose verification program created using MATLAB and applying stoichiometric calibration and Monte Carlo algorithm. With multi-leaf collimator positioning error, the clinical target volume (CTV) showed a dose difference of up to 13% in the dose delivered to the 95% volume, while the gross tumor volume (GTV) showed a dose difference of 9%. The average dose delivered to the total volume showed dose variation from -8.9% to 9% and -10.1% to 10.2% for GTV and CTV, respectively. The maximum dose delivered to the total volume of the spinal cord showed a dose difference from -14.2% to 19.6%, and the dose delivered to the 0.35 ㎤ volume showed a dose difference from -15.5% to 19.4%. In future research, automating the linkage between treatment planning systems and dose verification programs would be useful for spinal radiosurgery.
체적조절호형방사선치료 시 갠트리 회전과 다엽콜리메이터의 이동 속도에 따른 선량분포 평가
김연래(Kim Yon-Lae),정진범(Chung Jin-Beom),이정우(Lee Jeong-woo),신영주(Shin Young-Joo),강동진(Kang Dong-Jin),정재용(Jung Jae-Yong) 대한방사선과학회(구 대한방사선기술학회) 2019 방사선기술과학 Vol.42 No.3
The purpose of this study is to evaluate the dose distribution by gantry rotation and MLC moving speed on treatment planning system(TPS) and linear accelerator. The dose analyzer phantom(Delta 4) was scanned by CT simulator for treatment planning. The planning target volumes(PTVs) of prostate and pancreas was prescribed 6,500 cGy, 5,000 cGy on VMAT(Volumetric Modulated Arc Therapy) by TPS while MLC speed changed. The analyzer phantom was irradiated linear accelerator using by planned parameters. Dose distribution of PTVs were evaluated by the homogeneity index, conformity index, dose volume histogram of organ at risk(rectum, bladder, spinal cord, kidney). And irradiated dose analysis were evaluated dose distribution and conformity by gamma index. The PTV dose of pancreas was 4,993 cGy during 0.1㎝/deg leaf and gantry that was the most closest prescribed dose(5,000 cGy). The dose of spinal cord, left kidney, and right kidney were accessed the lowest during 0.1 ㎝/deg, 1.5 ㎝/deg, 0.3 ㎝/deg. The PTV dose of prostate was 6,466 cGy during 0.1 ㎝/deg leaf and gantry that was the most closest prescribed dose(6,500 cGy). The dose of bladder and rectum were accessed the lowest during 0.3 ㎝/deg, 2.0 ㎝/deg. For gamma index, pancreas and prostate were analyzed the lowest error 100% at 0.8, 1.0 ㎝/deg and 99.6% at 0.3, 0.5 ㎝/deg. We should used the optimal leaf speed according to the gantry rotation if the treatment cases are performed VMAT.
VitalBeam 선형가속기의 심부선량백분율과 측방선량분포 측정을 위한 새로운 기준 전리함으로서 스텔스 전리함의 성능 평가
김연래(Yon-Lae Kim),정진범(Jin-Beom Chung),강성희(Seong-Hee Kang),강상원(Sang-Won Kang),김경현(Kyeong-Hyeon Kim),정재용(Jae-Yong Jung)신영주(Young-Joo Shin),서태석(Tae-Suk Suh),이정우(Jeong-Woo Lee) 대한방사선과학회(구 대한방사선기술학회) 2018 방사선기술과학 Vol.41 No.3
Abstract The purpose of this study is to evaluate the performance of a “stealth chamber” as a novel reference chamber for measuring percentage depth dose (PDD) and profile of 6, 8 and 10 MV photon energies. The PDD curves and dose profiles with fields ranging from 3 × 3 to 25 × 25 cm 2 were acquired from measurements by using the stealth chamber and CC 13 chamber as reference chamber. All measurements were performed with Varian VitalBeam linear accelerator. In order to assess the performance of stealth chamber, PDD curves and profiles measured with stealth chamber were compared with measurement data using CC13 chamber. For PPDs measured with both chambers, the dosimetric parameters such as d max (depth of maximum dose), D 50 (PDD at 50 ㎜ depth), and D 100 (PDD at 100 ㎜ depth) were analyzed. Moreover, root mean square error (RMSE) values for profiles at d max and 100 ㎜ depth were evaluated. The measured PDDs and profiles between the stealth chamber and CC13 chamber as reference detector had almost comparable. For PDDs, the evaluated dosimetric parameters were observed small difference (<1%) for all energies and field sizes, except for d max less than 2 ㎜. In addition, the difference of RMSEs for profiles at d max and 100 ㎜ depth was similar for both chambers. This study confirmed that the use of stealth chamber for measuring commission beam data is a feasible as reference chamber for fields ranging from 3 × 3 to 20 × 20 cm 2 . Furthermore, it has an advantage with respect to measurement of the small fields (less than 3 × 3 cm 2 field) although not performed in this study.