장애인을 위한 차세대 PC 인터페이스 기술

신병석 한국차세대컴퓨팅학회 2005 한국차세대컴퓨팅학회 논문지 Vol.1 No.1

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.

간이식술 후 발생한 간동맥 협착 또는 혈전증의 방사선학적 치료

신병석,성규보,임수미,윤현기,송호영 대한영상의학회 2001 대한영상의학회지 Vol.44 No.6

목적: 간이식술 후 간동맥의 협착이나 혈전이 발생한 환자에서 시행된 중재적 시술의 결과와 유용성 에 대해 알아보고자 한다. 대상과 방법: 지난 5년간 간이식을 시행한 187명의 환자들 중 8명 (1-59세 .평균 연령 : 39세)에서 수술 후 1-40일(평균 18일)에 간기능 수치의 증가(AST/ALT)와 도플러 초음파에서 간동 맥내 혈류감소가 있었다 혈관조영술 상 고유 간동맥의 협착이나 폐색이 있던 6명에서 간동맥 협착으로 풍선을 이용한 혈관성형술을 시행하였다 이중 1명은 혈전용해 술후 혈관성형술을 시행하였다. 나머지 2명에서는 유로키나아제로 혈전용해술 만을 시행하였다. 4명에서는 위십이지장 동맥. 비장동맥과 우위동맥을 미세코일을 이용하여 폐쇄시켜 간동맥 혈류증가를 유도하였다. 결과: 풍선확장술을 시행한 모든 예에서 간동맥 혈류증가가 있었으며 3명에서 재협착으로 인하여 추가적 인 혈관성형술이 필요하였고 이중 1명 에서는 스텐트 삽입을 추가로 시행하였다. 이들 모두 6-17개월의 추적 검사상 정상 간기능을 유지하였다. 그러나 나머지 3명은 이식간의 기능 부전 또는 간신성 증후군, 패혈증으로 시술 후 4일 이내에 사망하였다. 혈전총해술 만을 시행한 경우 1명은 간기능 부전으로 사망하였고 나머지 1명은 재이식술을 시행받았다 시술과 관련된 합병증은 없었다 결론: 간이식 후 발생한 간동맥 협착 또는 혈전증에서 중재적 시술은 성공적 인 간이식을 위해서 유용한 방법이다 Purpose: To assess the results and usefulness of interventional procedures for hepatic arterial stenosis or thrombosis following liver transplantation. Materials and Methods: During the past five years, eight patients aged 1-59 ) mean, 391 years among 187 liver transplant recipients showed elevated of liver enzyme levels (AST/ALT) and decreased arterial flow at Doppler ultrasound. Hepatic arteriography revealed luminal stenosis or occlusion at the proper hepatic artery, and six patients, one of whom required thrombolysis before the procedure, underwent percutaneous transluminal angioplasty (PTA) using a balloon. In two with thronbosis, thrombolysis without PTA was performed. In order to increase hepatic arterial flow, four patients underwent additional coil embolization of the gastroduodenal or splenic artery, Results: Hepatic arterial flow recovered in all six patients after PTA Three required repeat PTA for restenosis and one of these needed scent placement after repeated PTA. At follow-up, 6-17 months later, the three had good hepatic function. Within four days, the other three expired due to graft failure, hepatorenal syndrome and sepsis. One of the patients who underwent thrombolysis without PTA expired and the other required retransplantation. In this case there were no procedure - related complications. Conclusion: Radiologic interventions are useful for treatment of hepatic arterial stensis or thrombosis in patients with liver transplantations.

한국문화콘텐츠진흥원

신병석 한국정보과학회 2008 정보과학회지 Vol.26 No.12

하나은행 정보전략본부

신병석 한국정보과학회 2008 정보과학회지 Vol.26 No.9

Incidental Detection of Interstitial Pregnancy on CT Imaging

신병석,박미현 대한영상의학회 2010 Korean Journal of Radiology Vol.11 No.1

Ectopic pregnancy is a potentially life-threatening condition. Detection of ectopic pregnancy on CT images is rare. In this case, we describe the CT findings of interstitial pregnancy both before and after rupture. If CT images demonstrate the presence of a strong enhancing ring-like mass in the pelvis, ectopic pregnancy should be considered.

외곽선을 이용한 고속 3차원 인체모델 재구성

신병석,노성,정회상,정민석,이용숙,Shin Byeong-Seok,Roh Sung,Jung Hoe-Sang,Chung Min Suk,Lee Yong Sook 대한의용생체공학회 2004 의공학회지 Vol.25 No.6

In order to create three-dimensional model for human body, a method that reconstructs geometric models from contour lines on cross-section images is commonly used. We can get a set of contour lines by acquiring CT or MR images and segmenting anatomical structures. Previously proposed method divides entire contour line into simply matched regions and clefts. Since long processing time is required for reconstructing cleft regions, its performance might be degraded when manipulating complex data such as cross-sections for human body. In this paper, we propose a fast reconstruction method. It generates a triangle strip with single tiling operation for simple region that does not contain branch structures. If there exist branches in contour lines, it partitions the contour line into several sub-contours by considering the number of vertices and their spatial distribution. We implemented an automatic surface reconstruction system by using our method which reconstructs three-dimensional models for anatomical structures. 의학 영상 분야에서 인체에 대한 3차원 모델을 생성하는 데는 평행한 2차원 영상위에 있는 외곽선들로부터 원래 물체의 형상을 복원하는 방법이 일반적으로 사용된다. CT나 MR영상을 획득한 후 해부구조물에 대해서 구역화를 하면 외곽선 집합을 얻을 수 있다. 기존의 표면 재구성 알고리즘은 외곽선을 단순 정합이 가능한 부분과 클레프트(cleft)를 나누어 처리하는데, 클레프트를 처리하는 시간이 오래 걸리기 때문에 모델이 복잡할 경우 수행속도가 저하되는 단점이 있다. 본 논문에서는 분기(branch)가 없는 단순영역을 형태에 관계없이 한번에 타일화하고, 분기가 있는 경우에는 한 외곽선의 정점들을 대응하는 외곽선들의 정점개수와 분포를 고려하여 분할함으로써 간단하고 신속하게 타일화하는 방법을 제안한다. 이 기법을 이용하여 해부구조물의 3차원 모델을 생성하는 표면 재구성 시스템을 구현하였다.

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

[기술해설]특징 기반의 3차원 물체 정보 검색 시스템 모델

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

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.