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박철수(Cheol-Su Park),민재용(Jae-Yong Min),정명숙(Myung-Sook Jung),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.3
This paper presents the design, fabrication and measurement of a lightweight W-band Cassegrain reflector antenna applicable to sub-munition sensors in precision artillery. A reflector antenna is optimally designed which consists of a dual-mode feedhorn, a subreflector and a main reflector. The main reflector and the subreflector-radome bodies are formed using injection molding technique and the reflecting surfaces are metalized using a PVD process. The dual-mode feedhorn is precisely machined out of an aluminum block. Measurements of the fabricated unit show that the proposed antenna has reflection coefficient of less than -16㏈ over 1.2% bandwidth, 38.6㏈i gain and 1.8° beamwidth at the center frequency.
핵의학(Nuclear Medicine) 소개 PET/MRI
박철수(Cheol-su Park),주명식(Myung-sik Ju) 한국자기학회 2019 韓國磁氣學會誌 Vol.29 No.5
Nuclear medicine is a field of medicine that uses radioactive materials for diagnosis and therapy of human diseases. Radionuclide is combined with medicines to form chemicals. It also forms radiopharmaceuticals in combination with pharmaceutical compounds. Radiopharmaceuticals refer to unsealed radioactive isotopes, compounds and preparations used for diagnosis or therapy. A great advantage of nuclear medicine is the imaging of morphological changes in human diseases. Unlike conventional diagnostic exam, the extent of disease processes in the human body can be imaged based on the cellular function and physiology of the tissue. Nuclear medicine is used for prognostic determination and therapy planning after diagnosis and therapy of disease. The nuclear medicine exam differs from the radiological imaging exam. The main difference is that the radiation sources used for imaging are gamma-rays and beta-rays. According to the generated physical principle, it is divided into single photon emission image and positron emission image. The purpose of this article is to discuss the introduction of nuclear medical imaging systems and PET/MRI (positron emission tomography/magnetic resonance imaging) and future development directions.
폐암 환자의 정위적 방사선 수술 시 Respiratory Gating System의 유용성에 대한 연구
송흥권,권경태,박철수,양오남,김민수,김정만,Song Heung-Kwon,Kwon Kyung-Tae,Park Cheol-Su,Yang Oh-Nam,Kim Min-Su,Kim Jeong-Man 대한방사선치료학회 2005 대한방사선치료학회지 Vol.17 No.2
Purpose : For stereotactic radiosurgery (SRS) of a tumor in the region whose movement due to respiration is significant, like Lung lower lobe, the gated therapy, which delivers radiation dose to the selected respiratory phases when tumor motion is small, was performed using the Respiratory gating system and its clinical effectiveness was evaluated. Materials and Methods : For two SRS patients with a tumor in Lung lower lobe, a marker block (infrared reflector) was attached on the abdomen. While patient' respiratory cycle was monitored with Real-time Position Management (RPM, Varian, USA), 4D CT was performed (10 phases per a cycle). Phases in which tumor motion did not change rapidly were decided as treatment phases. The treatment volume was contoured on the CT images for selected treatment phases using maximum intensity projection (MIP) method. In order to verify setup reproducibility and positional variation, 4D CT was repeated. Results : Gross tumor volume (GTV) showed maximum movement in superior-inferior direction. For patient #1, motion of GTV was reduced to 2.6 mm in treatment phases ($30{\sim}60%$), while that was 9.4 mm in full phases ($0{\sim}90%$) and for patient #2, it was reduced to 2.3 mm in treatment phases ($30{\sim}70%$), while it was 11.7 mm in full phases ($0{\sim}90%$). When comparing two sets of CT images, setup errors in all the directions were within 3 mm. Conclusion : Since tumor motion was reduced less than 5 mm, the Respiratory gating system for SRS of Lung lower lobe is useful.