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이중 표적 척추 전이암의 체부정위방사선치료 시 Halcyon LINAC의 치료 유용성 평가
정희주,안예찬,박병석,박명환,박용철,Jeong Hee Ju,An Ye Chan,Park Byung Suk,Park Myung Hwan,Park Yong Chul 대한방사선치료학회 2022 대한방사선치료학회지 Vol.34 No.-
Objectives: The purpose is to evaluate dosimetric performance and delivery efficiency of VMAT with Halcyon LINAC for double target spine SBRT Materials and Methods: 12 patients with spine oligometastases were retrospectively studied. Single-isocenter spine SBRT plans was established using Halcyon® with Dual Layer MLC and Truebeam® with High Definition MLC. All patients' plans were created in Eclipse TPS through the identical conditions and optimization. C.I, H.I, G.I (Gradient Index), maximal and volumetric doses to spinal cord and low dose area were evaluated for comparison of both plans. Also, total MU and BOT(Beam On Time) were evaluated. Results: Halcyon plans was no Statistical differences in C.I and H.I. However, the average of G.I was 4.64 for Halcyon, which decreased to 5.5% compared to Truebeam (P<0.001). Halcyon plans demonstrated statistically significant reduced G.I. The average of 50% and 25% isodose volume was 487.56 cc (-3.82%, P<0.001), 1859.45 cc (-4.75%, P<0.001) in Halcyon, respectively. Significantly reduced low dose spill were observed in Halcyon plans. In the evaluation of the spinal cord, the average of Dmean and V10 of Halcyon plans in the sample group with an overlap volume of less than 1 cc was 6.802 Gy (-3.504%, P=0.067), 5.766±1.683 cc (-8.199%, P=0.002), respectively. Halcyon plans demonstrated statistically significant reduced D<sub>mean</sub> and V10. For delivery efficiency, MU and BOT(maximum dose rate for each machine), on average, increased in Halcyon plans. However, the average of BOT(800MU/min for each machine) was 648.33 sec for Halcyon (-1.74%, P<0.001). Conclusion: Halcyon plan for double-target spine SBRT demonstrated advantages in the low dose area with a steep dose gradient, while having dosimetrically equivalent target dose distribution and spinal cord protective effect. As a result, Halcyon LINAC produced a dosimetrically improved plan for double-target spine SBRT.
VOC 농축을 위한 제올라이트가 담지된 코러게이트형 흡착제용 슬러리 제조 조건 최적화
고은희(Eun Hee Ko),부진호(Jinho Boo),정희주(Hee Ju Jeong),권병찬(Byung Chan Kwon),강도형(Dohyung Kang),박노국(No-Kuk Park),윤대식(Daesik Yun) 한국에너지기후변화학회 2021 에너지기후변화학회지 Vol.16 No.2
In this study, the dip coating procedure of zeolite on the corrugated glass fiber was optimized according to the amounts of solid content, the dispersant, and the inorganic binder. Slurries was prepared by mixing hydrophobic zeolite with water and then, the corrugated fiber was dip-coated into the prepared zeolite slurries. By varying slurry preparation conditions, the amount of zeolite loaded on the corrugated support was measured. As the zeolite and dispersant contents in the slurry increased, its viscosity increased, resulting the higher zeolite loading on the corrugated fiber. However, for achieving a uniform coating, the slurry prepared with 30 wt% of zeolite was used for the dip-coating method. The final zeolite-loaded glass fiber can be potently used as a VOC adsorbent.