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Silicon retinal tack for the epiretinal fixation of the polyimide electrode array
서종모,백승준,김의태,변상원,이아라,조동일,김성준,유형곤,유영석,정흠 한국물리학회 2006 Current Applied Physics Vol.6 No.4
Silicon-micromachined retinal tacks were developed for the xation of the epiretinal-type retina-stimulating microelectrodearray. Silicon retinal tacks were fabricated by using the silicon on insulator (SOI) process, a method of releasing silicon structuresin a SOI wafer. The dimensions of the retinal tack were substantially smaller than those of the conventional titanium tack, at 1.5 mmlong, 150l m wide, and 150l m thick. To enhance the durability and biocompatibility of the retinal tack, 3l m-thick parylene lmwas uniformly deposited on the entire surfaces. Short-term evaluation of the durability of the silicon retinal tack in vivo showedacceptable biocompatibility and rm xation of the microelectrode array onto the retina.
서종모(Jong-Mo Seo),김광기(Kwang Gi Kim),김종효(Jong-Hyo Kim),박광석(Kwang-Suk Park),정흠(Hum Chung) 대한검안학회 2007 Annals of optometry and contact lens Vol.6 No.1
목적: 디지털 안저사진을 이용하여 안구 회선을 객관적으로 측정하는 방법을 개발하고, 이를 전문의의 판독과 비교하였다. 대상과 방법: 디지털 카메라가 장착된 안저 촬영기를 이용하여 촬영각 60o로 얻은 1,520×1,080 화소의 컬러 안저사진 100예를 분석하였다. MATLAB을 이용하여 저자들이 개발한 프로그램으로 시신경유두와 황반의 중심을 분할, 판정하고, 이 두 점을 잇는 직선과 시신경유두중심을 지나는 수평선이 이루는 각도를 계산하여 전문의의 판독과 비교하였다. 결과: 기술한 방법으로 시신경유두와 황반 영역을 자동으로 분할하고 각각의 중심을 찾은 뒤 안구 회선을 측정할 수 있었고, 측정된 회선 각도는 3.02±1.24o였다. 전문의의 판독에 의한 회선 각도는 3.13±1.98o였으며, 컴퓨터 프로그램에 의한 측정값과의 차이는 없었다(p>0.05; paired t-test). 결론: 컴퓨터 프로그램을 이용한 안저 회선 측정법은 전문의의 판독과 잘 일치하였으며, 정확한 진단과 객관적 평가에 도움을 줄 수 있을 것이다. Purpose: Computer-based objective measurement of the ocular cyclotorsion using digital fundus photograph was developed and the result was compared with that of the ophthalmologist. Methods: One hundred cases of the color digital fundus photographs acquired with the field angle of 60o, 1,520×1,080 in resolution were analyzed. Optic disc and macula were segmented with the program developed by authors on MATLAB. The angle between the horizontal line running through the center of the optic disc and the line connecting the center of optic disc and macula was measured, and compared with the torsion determined by the ophthalmologist. Results: Optic disc and macula were segmented and the mean of the calculated angle was 3.02±1.24o. The mean of the torsion determined by the ophthalmologist was 3.13±1.98o and there was no difference between the two (p>0.05; paired t-test). Conclusions: The measurement of the cyclotorsion using computer program showed good coincidence with that of the ophthalmologist and it will help precise diagnosis and the objective evaluation of the disease for the physicians.