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정위적 방사선 수술에서 물팬텀을 이용한 목표점 및 전달 선량확인
강영남,이동준,권수일,권양,Kang, Young-Nam,Lee, Dong-Jun,Kwon, Soo-Il,Kwon, Yang 한국의학물리학회 1996 의학물리 Vol.7 No.2
정위적 방사선수술 (Stereotactic radiosurgery) 은 병소(region)의 위치를 정확히 결정하고 치료에 요구되는 방사선량이 정확히 전달되는 것이 중요하다. 본 연구는 이를 실험적으로 확인할 목적으로 특별히 고안된 물팬텀 (water phantom)을 개발하여 Leksell 정위기구 (Leksell Stereotactic Frame; LSF)에 부착하여 방사선수술을 시행하였다. 방사선 수술에는 Leksell 감마나이프 (Gamma Knife Unit; GKU) 와 LSF를 사용하였으며 실험을 위해 개발된 팬텀은 1mm 두께 플라스틱의 직경 160mm의 구형으로 물을 채울수 있는 구조로 되어있다. 측정장치로서는 목표점 설정(target localization)을 위한 필름과 전달 선량(dose delivery) 측정을 위해 이온 전리함(ionchamber) 을 사용하였으며 이를 팬텀의 목표점에 각각 위치시킬 수 있도록 설계하였다. 본 연구에서 목표점 확인은 허용 오차범위인 $\pm$0.5 mm 이내에서의 값을 보였으며 선량전달값은 $\pm$3% 정도의 오차로 허용값내에 있음을 보여주었다. 본 연구에서 개발된 팬텀으로 측정된 값이 모두 허용 오차범위 내에 있음을 보여주었고 이로인해 GKU 및 LSF의 주기적 QA(Quality Assurance)에 계속적으로 사용할수 있게 되었다. It is important that the precise decision of the region and the accurate delivery of radiation dose required for treatment in the stereotactic radiosurgery. In this research, radiosurgery was carried with Leksell streotactic frame(LSF) which is especially developed water phantom to verify in experiment. Leksell Gamma Knife and LSF are used in radiosurgery is the spherical water phantom has the thickness of 2 mm, the radius of 160mm. The film for target localization and ionchamber for dose delivery was used in measurement instruments We compare the coordinate of target which is initialized by biplannar film with simple X-ray to the coordinate of film measured directly. The calculated dose by computer simulation and the measured dose by ionization chamber are compared. In this research, the target localization has the range ${\pm}$0.3mm for the acceptable error range and the absolute dose is :${\pm}$0.3mm for the acceptable error range. This research shows that the values measured by using the especially manufactured phantom are included the acceptable error range. Thus, this water phantom will be used continuously in the periodic quality assurance of Gamma Knife Unit and Leksell Stereotactic Frame.
양중식,백영남 慶熙大學校 材料科學技術硏究所 1989 材料科學技術硏究論集 Vol.2 No.-
The crystallization and sintering behavior and the linear thermal expansion properties of glass-ceramic of low thermal expansion in the Li_(2) O-Al_(2)O_(3)-SiO_(2) system prepared by multicomponent dried gel of composition Li_(2)O·Al_(2)O_(3)·4 SiO_(2) have been investigated. The results were as follows: 1) β-eucryptite-quartz and spodumene-quartz solid solution and Li_(2)O·Al_(2)O_(3)·3 SiO_(2) crystals were detected in sintered monolithic specimen heated above 750℃. 2) Within the temperature range of 0-500℃, the thermal expasion coefficient of the sintered specimen at 700℃ was shown as 49.6×10^(-7)/℃, and the crystallized specimens were shown as 0 -6.0×10^(-7)/℃, respectively. 3) Dilatometric measurement on the gel has shown that a large and sharp thermal shrinkage was found to begin at 600℃ to about 900℃.
梁重植,白英男 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-
The purpose of this investigation was to prepare high efficiency infrared radiant by ceramics made from mixture of several kinds of transitional element oxide and the domestic basalt with a clay. The relative far-infrared radiation of the domestic basalt with several kinds of mixed transition metal oxides(Fe_(2)O_(3), MnO_(2), Co_(2)O_(3), CuO) as radiating additives was investigated in terms of the amount of additives and the basalt contents. These results revealed that the radiants of the mixed transition metal oxides can be emitted into four main types exhibiting ferric oxide-, mangane dioxide-, cobalt oxide- or cupric oxide- like behavior. And the radiant consists of the basalt and clay that decrease in the effect of the emissive intensity than the radiants of the mixed metal oxides.
용융 AI-10Si 합금의 산화피막강도 및 표면 미세조직에 미치는 Mg첨가의 효과에 관한 연구
김길수,양중식,김기주,백영남 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-
This study was carried out to determine the strength of oxide skins of Al-10Si alloy melts and the effect of Mg addition on the morphology of oxide skins as the practical alloy for automobile piston. This has been observed by Rotational Die Movement Equipment for the temperature range from 600℃ to 720℃, the oxidation time range from 2 min. to 60 min. and the Mg weight percent(wt %) range from 1% to 5%. As the surface temperature and the surface oxide time of alloy melts increased, the crystalization of oxide layer and the creation of oxides were verified.