한국문화콘텐츠진흥원

신병석 한국정보과학회 2008 정보과학회지 Vol.26 No.12

하나은행 정보전략본부

신병석 한국정보과학회 2008 정보과학회지 Vol.26 No.9

피하매몰 중심정맥포트 설치술:천자위치와 시술방법에 따른 비교

신병석,안문상,Shin, Byung-Suck,Ahn, Moon-Sang 대한영상의학회 2003 대한영상의학회지 Vol.49 No.3

목적: 피하매몰 정맥포트 삽입시 설치경로와 방법에 따른 결과와 합병증을 알아보고자 한다. 대상과 방법:2001년 4월부터 2002년 10월까지 피하매몰 중심정맥포트를 삽입하였던 95명의 환자,103개의 피하매몰 정맥포트를 대상으로 하였다.모든 예에서 항암요법을 실시하기 위해서 일체형(n=39)과 분리형 (n=64)의 정맥포트를 삽입하였다. 천자는 좌측 쇄골하정맥(n=35), 우측 쇄골하정맥 (n=5),좌측 내경정맥 (n=9),우측 내경정맥 (n=54)에서 시행하였다. 설치경로와 방법에 따른 포트의 사용기간과 합병증을 분석하였다. 결과: 모든 예에서 피하매몰 정맥포트를 성공적으로 설치를 하였다.도관의 삽입 기간은 8-554일(평균 159일, 총 17,872일)이었다. 시술과 관련된 초기합병증으로 일시적인 폐동맥 공기색전 (n=1),소량혈종(n=1)과 일체형의 포트사용시 도관의 위치이상 (n=2)이 발생하였다. 후기합병증으로 도관의 이동 (n=5),포트기능부전 (n=3), 도관폐쇄(n=1)와 감염 (n=11)이 발생하였고 이중 15예(14.5%)에서 포트를 제거하였다. 도관의 이동이 있던 예는 모두 쇄골하정맥을 천자한 경우이며 내경정맥은 발생하지 않았다 (13%,p=.008).감염은 10.7%(0.61 per1000 catheter days)에서 발생하였다. 도관과 연관된 중심정맥 혈전증의 발생은 없었다. 결론: 피하매몰 포트의 삽입은 안전하게 시행할 수 있으며 쇄골하정맥보다는 우측 내경정맥을 천자위치로 선택하는 것이 합병증 발생이 적으며 포트는 분리형을 사용하는 것이 시술시 보다 편리한 것으로 보인다. 시술 후 장기적으로 사용하기 위해서는 포트에 대한 적절한 관리가 필요하다. Purpose: To evaluate the results and complications of placement of implantable port according to approach routes and methods. Materials and Methods: Between April 2001 and October 2002, a total of 103 implantable chemoport was placed in 95 patients for chemotherapy using preconnected type (n=39) and attachable type (n=64). Puncture sites were left subclavian vein (n=35), right subclavian vein (n=5), left internal jugular vein (n=9), right internal jugular vein (n=54). We evaluated duration of catheterization days, complications according to approach routes and methods. Results: Implantable chemoport was placed successfully in all cases. Duration of catheterization ranged from 8 to 554 days(mean 159, total 17,872 catheter days). Procedure related complications occurred transient pulmonary air embolism (n=1), small hematoma (n=1) and malposition in using preconnected type (n=2). Late complications occurred catheter migration (n=5), catheter malfunction (n=3), occlusion (n=1) and infection (n=11). Among them 15 chemoport was removed (14.5%). Catheter migration was occured via subclavian vein in all cases (13%, p=.008). Infection developed in 10.7% of patients(0.61 per 1000 catheter days). There were no catheter-related central vein thrombosis. Conclusion: Implantation of chemoport is a safe procedure. Choice of right internal jugular vein than subclavian vein for puncture site has less complications. And selection of attachable type of chemoport is convenient than preconnected type. Adequate care of chemoport is essential for long patency.

Anti-aliasing on Deformed Area Using Adaptive Super Sampling during Volume Ray-casting

신병석,Supyeong Chae,Koojoo Kwon 대한의용생체공학회 2011 Biomedical Engineering Letters (BMEL) Vol.1 No.3

Purpose In modern GPUs, deformation has been possible to perform direct space warping in texture-based rendering and GPU-based ray-casting. The problem of direct space warping is lead to provide aliasing artifacts on deformed area. The variation of sampling interval in original space and deformed space is cause of the aliasing. Methods To reduce this artifact, we apply the adaptive super sampling method to deformed area. We divide view plane into several areas and applied different super sampling kernel to each detected aliased region. Firstly, we decide the deformed area using deformation mask which includes transformed position. Secondly, we select a boundary region in the deformed area. Aliasing artifact mostly appears in a boundary of an object. Then we execute super sampling on the intersection of deformed and boundary regions. Results We reduce rendering time which is cause of additional super sampling operation by selecting the target area of view plane. Our method has been about 20% faster than the fully super sampled method since we reduced the super sampling region in the view plane. Conclusions Volume deformation is commonly used in visualization techniques especially in medical volume simulation field. In this paper, we propose an adaptive super sampling method on deformed area. It is possible to visualize enhanced result image only as spending a little additional rendering time.

Comparison of Radiofrequency Ablation with Saturated Saline Preinjection and Renal Artery Occlusion: In Vivo Study in Canine Kidneys

신병석,안문상,박미현,전경식,이병모,이기창,김호준,엄준영 대한영상의학회 2012 대한영상의학회지 Vol.66 No.4

Purpose: To compare the ablation zone after radiofrequency ablation (RFA) with saturated saline preinjection and renal artery occlusion in canine kidneys. Materials and Methods: RFA was induced in the kidneys of six mongrel dogs. A total of 24 ablation zones were induced using a 1-cm tip internally cooled needle electrode in three groups: RFA (Control group), RFA with 0.5 mL saturated saline preinjection (SS group), and RFA with renal artery occlusion by atraumatic vascular clamp (Occlusion group). Ablation zone diameters were measured along transverse and longitudinal sections of the needle axis, and volumes were calculated. Temperature, applied voltage, current, and impedance during RFA were recorded automatically. Results: The RFA zone volume was the largest in the SS group (1.33 ± 0.34 cm3), followed by the Occlusion group (1.07 ± 0.38 cm3) and then the Control group (0.62 ± 0.09 cm3). Volumes for the SS and Occlusion groups were significantly larger than those for the Control group (p = 0.001, p = 0.012). There was no significant difference in volumes between the SS and Occlusion groups (p = 0.178). Conclusion: Saturated saline preinjection is as effective as renal arterial occlusion for expanding the ablation zone. RFA with saturated saline preinjection could help to treat large renal tumors.

복부 악성 종양 수술 후 발생한 장관 폐색의 CT 유용성

신병석,하현권,윤수웅,김동은,김지훈,정융기,김표년,이문규,오용호 대한영상의학회 1998 대한영상의학회지 Vol.39 No.2

기능적 자기공명영상을 이용한 단일과 복합 수지 운동의 비교 연구

신병석,이호규,박성태,김동은,김재균,이명준,최충곤,서대철,임태환 대한영상의학회 1998 대한영상의학회지 Vol.38 No.6

Purpose : To assess, using functional MRI and by comparing activated motor sensory areas, the independence ofbrain activation during single and alternative multiple hand tasks. Materials and Methods : The subjects were sixhealthy volunteers. Using at 1.5T Siemens system and single shot FID-EPI sequencing(T2* weighted image;TR/TE0.96msec/61msec, flip angle 90。, matrix size 96X128, slice thickness/gap 5mm/0/8mm, FOV 200mm) and T1-weightedanatomic images, functional MRI was performed. The paradigm of motor tasks consisted of appositional fingermovements; the first involved the separate use of the right, left, and both hands, while an alternative taskinvolved the use of the right, left, and both hands in sequence. Using cross-correlation method(threshold:0.6) andfMRI analysis software (Stimulate 5.0), functional images were obtained. The activated area of brain cortex, thenumber of pixel, the aberage percentage change in signal intensity, and correlation of the time-signal intensitycurve in the activated motor area were analysed and compared between the two task groups. Statistical analysisinvolved the use of Wilcoxon signed-rank test. Results : It was seen on fMRI that durina both single andalternative motor tasks, the same areas were consistently activated; in four volunteers, most activation occurredin the contralateral primary motor area. Between the two task methods, the average change in the number ofactivated pixels was 12.3$\pm$5%, but the difference was not statistically significant(P>0.1). Increased signalintensity in the alternative task group(7.48$\pm$1.22%) was more statistically significant than in the single taskgroup(5.77$\pm$0.9%)(P<.001). With regard to the time-intensity curve, there was significant correlation between thetwo groups(0.87$\pm$0.07). Conclusion : Brain activation did not differ according to whether the motor task wassingle or alternative. We therefore suggest that during multiple stimuli, the relevant functional areas andneuronal column are activated independently.7???5???7???5???7???

기술표준원

신병석 한국정보과학회 2008 정보과학회지 Vol.26 No.6

한국정보보호 산업협회

신병석 한국정보과학회 2008 정보과학회지 Vol.26 No.5

[기술해설]특징 기반의 3차원 물체 정보 검색 시스템 모델

신병석,신영길 한국정보과학회 1995 정보과학회지 Vol.13 No.1