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Einzel 렌즈안의 전위분포와 이온 궤적에 관한 Computer Simulation
우정주,황정남,고년규,정원모,이철주 연세대학교 자연과학연구소 1982 學術論文集 Vol.9 No.-
Einzel lens 내부의 전위분포와 대전입자의 궤적에 대하여 computer simulation 시킨 결과, 3 tube Einzel lens의 초점거리 f/R는 중앙 전극의 길이가 일정할 때 S/R가 증가함에 따라 감소하였고, S/R가 일정할 경우에는 L/R이 증가함에 따라 f/R가 감소하였으며, spherical aberration 계수와 chromatic aberration 계수는 중앙전극의 길이가 증가함에 따라 감소하였다. Computer simulation for the charged particle trajectory and potential distribution in Einzel lens is described. An adequate matrix is employed to simulate the potential in rectangular or axisymmetric configuration, and trajectory computations are employed to simulate charged particles. The focal length f/R of 3-tube Einzel lens is decreased as increasing S/R at constant length of central electrode, and also f/R is decreased as increasing L/R at constant value of S/R. The spherical and chromatic aberration coefficients are decreased as increasing the length of central electrode.
척추 압박골절의 자기공명영상 : 양성 골절과 전이성 골절의 감별진단
우정주 대한영상의학회 1995 대한영상의학회지 Vol.33 No.5
Purpose : To evaluate the MR image in the differentiation of benign and malignant lesion in compressionfractures of the vertebral body. Materials and Methods : MR images of 47 benign(acute traumatic within onemonth:19, chronic traumatic longer than one month or nontraumatic:28) and 21 metastatic compression fractures wererespectively reviewed in terms of margin of lesions, signal intensity, paraspinal mass formation, soft tissuechange, and involvement of posterior element of vertebra. MR images of T1-(T1WI) and T2*-weighted gradient echo(GE T2WI) sequences were obtained on 0.5 T unit in sagittal and axial orientation with 5mm section thickness.Results : The margin of benign compression fracture was usually indistinct (acute fracture: 90% (17/19), chronicfracture: 68% (19/28)), whereas it was sharply delineated in metastatic compression fracture(92%, 12/13) (p<0.001). Paraspinal mass was seen in both acute traumatic and metastatic compression fractures(acute fracture:26% (5/19), metastatic fracture: 52% (11/21) ). Soft tissue change was seen only in acute compression fractures(58%,11/19). Involvement of posterior element of vertebra was noted in metastatic fracture (71%, 15/21), acutefracture (32%, 6/19) and chronic fracture (7%, 2/28) Conclusion : On MR imaging, involvement of entire portion ofa given vertebral body, sharp margin between normal and abnormal areas in partially involved cases, paraspinalmass formation, and posterior element involvement are more frequently seen in metastatic compression fractures,which are considered to be useful in differentiation between benign and malignant causes of compression fracture.
우정주,김희중,정중화,장경식,홍순표,고영엽 연세대학교의과대학 2008 Yonsei medical journal Vol.49 No.4
Purpose: Cardiac dysfunction and hyperdynamic systemic circulation may be present in patients with cirrhosis. The purpose of this study was to identify relations between plasma levels of N-terminal-proBNP (NT-proBNP), reflecting early ventricular dysfunction, and the severity of liver disease and cardiac dysfunction in cirrhotic patients. Materials and Methods: Sixty-three cirrhotic patients and 15 controls (group 1) were enrolled in this study. Plasma levels of NT-proBNP were determined in echocardiographically examined patients, which were allocated to 1 of 3 groups according to Child-Pugh classification or into 2 groups, i.e., a compensated group without ascites (group 2) and decompensated group with ascites (group 3). Results: Plasma NT-proBNP levels were significantly higher in cirrhotic patients (groups 2 and 3) than in age-matched controls (155.9 and 198.3 vs. 40.3pg/mL, respectively, p<0.05). NT-proBNP levels were significantly increased in Child class C patients than in classes B and A (250.0 vs. 168.6 and 119.6pg/mL, respectively, p<0.05). Left atrial dimension, wall thickness of left ventricle, and EF or E/E' were significantly increased, and EDT was prolonged in cirrhotic patients than in controls. Increased LVMI and decreased E/A ratio were noted in the group of patients with ascites as compared with the other groups. Conclusion: Plasma NT-proBNP levels were high in cirrhotic patients and are likely to be related to the severity of disease. Advanced cirrhosis is associated with advanced cardiac dysfunction, and NT-proBNP levels has predictive value for concomitant cardiac dysfunction and cirrhosis progression.
미숙아에서 발생한 중추신경계 칸디다증의 초음파와 자기공명영상 소견: 2예 보고
김교남,우정주,박용휘,김순용,김은령 대한영상의학회 2001 대한영상의학회지 Vol.45 No.1
중추신경계 칸디다증 (candidiasis)은 비교적 드문 질환으로 다른 진균 감염과 마찬가지로 주로 면역기능이 저하된 환자에서 발생한다. 최근 항생제의 빈번한 사용과 신생아 집중치료술의 발달로 면역기능의 발달이 미약한 극소체중아의 생존율이 증가되어 미숙아의 전신성 진균 감염과 이에 따른 중추신경계 칸디다증이 늘어나는 추세이다 저자는 미숙아에서 발생한 2예의 중추 신경계 칸디다증을 뇌 초음파와 자기공명영상과 함께 보고하고자 한다 Candidiasis of the central nervous system (CNS) is a rare condition and like other opportunistic fungal infecttions, most commonly occurs in immune-compromised patients. Because of the increasing use of antibiotics and the improving survival rate of premature infants requiring intensive care, the incidence of fungal infecttions in the brain has increased. We report the findings of ultrasonography and MR imaging in two cases of candidiasis of the CNS in premature infants.
장중첩증을 초래한 소아의 회장 고등급 MALT 림프종: 1예 보고
김교남,우정주,김순용,Kim, Gyo-Nam,U, Jeong-Ju,Kim, Sun-Yong 대한영상의학회 2002 대한영상의학회지 Vol.46 No.3
소아에서 림프종은 백혈병과 중추신경계 종양에 이어 세번째로 많은 종양이다. 소아연령에서 발생한 비호지킨 림프종은 성인의 림프종과는 달리 임파절 이외의 침범이 흔하며 호발 부위로는 위장관, 신장, 췌장을 포함하는 복부이고 그 다음이 두경부 순이다. 성인에서는 위장관에 생기는 림프종의 상당수가 림프절에 생기는 림프종과는 다른 MALT (mucosa associated lymphoid tissue) 림프종 소견을 보이는 것으로 알려져 있으며 소장의 MALT 림프종의 보고는 많으나 소아의 소장에서 문헌상 보고된 것은 드물다. 우리는 최근 9세 된 남아의 회장에 발생한 고등급 MALT림프종이 장중첩을 일으킨 1예를 경험하였기에 초음파 및 전산화단층소견을 보고 하고자 한다. Lymphoma is the third most common childhood malignancy after leukemia and brain tumor. In contrast to adult non-Hodgkin's lymphoma, that occurring in children is usually found extranodally. The most common site is the abdomen, including the gastrointestinal tract, kidney and pancreas, and the next most common is the extranodal head and neck. Gastrointestinal non-Hodgkin's lymphoma in adults is usually considered to be MALT lymphoma, a distinct B-cell type, but the occurrence of this variety in the small bowel of children is relatively rare. We report a case of high-grade MALT lymphoma occurring in a nine-year-old boy who presented with ileoileal intussusception.