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전뇌(Whole Brain)치료 시 Field-in-Field Technique 적용에 관한 고찰
김보겸,이제희,정치훈,박흥득,Kim Bo Kyoum,Lee Je Hee,Jung Chi Hoon,Pack Heung Deuk 대한방사선치료학회 2005 대한방사선치료학회지 Vol.17 No.1
Purpose : Uniform dose distribution of the target volume is very important in the radiation treatment. We will evaluate the usefulness of Field-in-Field Technique use to get uniform dose distribution of the target volume and try to find Apply possibility out to a whole brain treatment patient of various thickness. Material and method : We compare the dose distribution when we applied Field-in-Field Technique and parallel opposed fields technique. establish the treatment plan to a phantom(acryl 16cm spheral phantom) and do the measurement, assessment use the TLD and Low sensitivity film. Also the assessment did Apply possibility of Field-in-Field Technique to 20 patient object of various thickness. Result : In the case to use the parallel opposed fields at the whole brain treatment $10-12\%$ high dose region appeared but reduce to $3-4\%$ lesses when we used the Field-in-Field technique. We could get similar numerical value the film and TLD measurement result also. The change of the dose distribution appeared to its ${\pm}1{\sim}2\%$ although it applied such Field-in-Field technique to various patient so that we were identical. Conclusion : We can get uniform dose distribution of in the treatment region if we apply the Field-in-Field technique at the whole brain treatment. Also alternate can play the role of the wedge filter and 3D compensator and We are thought by minimizing the obstacle to be happened due to the high dose region when radiation treatment.
이방성 에칭 첨가제 기술로 제작된 인쇄회로 열교환기의 성능 평가
김보겸(Bo Kyem Kim),류진우(Jin Woo Yoo),홍오원(O Won Hong),이동규(Dong Kyu Lee),윤석호(Seok Ho Yoon) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
A printed circuit heat exchanger (PCHE) which is a type of plate-fin heat exchanger, has been considered as an alternative heat exchanger for wide industries requirements of high efficiency and compactness. The PCHE consists of metal plates which flow channels are etched and these plates are stacked by diffusion bonding. There are many methods for etching process, and chemical etching is preferred for a precise micro channel production. But the chemical etching technology etches plates isotropically because vertical and lateral etching rate are same. To control etching rate of each direction, anisotropic etching inhibitor method is suggested. These technology decrease the lateral etching speed by coating the channel wall. In addition, the rib length can be reduced, and the number of flow channels in the same plate area may increase. In this study, we compared the heat transfer performance of lab-scale PCHE which produced by the anisotropic etching inhibitor method and original ones by using water as working fluid. As a result, the heat performance of PCHE with new etching method is higher than the original ones.