• Tuberculosis and Respiratory Diseases
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• 제56권1호
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• pp.85-90
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• 2004

Rasmussen 동맥류는 공동성 폐결핵에 동반되어 종종 대량객혈을 일으킬 수 있어 임상적으로 중요하다. 그동안 이의 존재나 치료에 대한 보고는 간헐적으로 있어왔으나 본 증례와 같이 기관지내시경으로 직접 병변을 관찰하고 나선식 CT로 Rasmussen 동맥류의 존재를 확인한 경우는 없어 이에 보고하는 바이다. 또한 기관지 내시경 검사시 발견되는 종양 형태의 병변에는 이와 같은 혈관성병변도 있을 수 있으므로 생검 등의 침습적 검사시에 보다 신중해질 필요가 있으며, 기존 질환이 진행된 공동성 폐결핵일 경우에는 더욱 주의를 필요로 한다.

• Annals of Clinical Neurophysiology
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• 제2권1호
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• pp.13-20
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• 2000

Background and Objective : Visual evoked potentials(VEPs) is considered to be a reliable diagnostic procedure for examining patients with anterior visual pathways. Some abnormalities in the recordings on monocular stimulation have been said to indicate retrochiasmal lesion, but less consistent results have been reported. This study is to evaluate the positive predictability of VEP for the detection of retrochiasmal lesion. Methods : We reviewed VEPs that could be interpreted as indicative of a retrochiasmal lesions, based on amplitude or latency asymmetry recorded on the left(O1) and right(O2) occipital regions. Bilateral absent VEPs on both recording(O1 and O2) without evidence of prechiasmal lesion were included. During 5 years, we identified 31 patients who met the above criteria and who had undergone magnetic resonance imaging(MRI) of brain(one patient underwent computerized tomography). Twenty three patients underwent pattern reversal VEPs and others underwent flash goggle VEPs. Results : Brain imagings were abnormal in 29 and were normal in 2. Of the 29 abnormal scans, lesions in posterior visual pathway were detected in 21 scans(predictive value=68%). The predictive value was not significantly different between flash goggle VEP(75%) and pattern reversal VEP(68%). The predictive value was higher in patient with visual field defect(100%) than those without visual field defect(25%). The pathologic nature of lesion also showed close relations to the predictive value. VEPs is usually paradoxically lateralized(78%), but not in all patients. Conclusion : VEPs abnormalities suggesting retrochiasmal lesion were usually corresponded with brain MRI findings. Diagnostic reliability could be increased when considering the visual field defect and nature of lesion. Therefore, the authors suggest that VEPs studies could be useful in evaluating the patients with the retrochismal lesion.

• 대한의용생체공학회:의공학회지
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• 제29권3호
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• pp.212-221
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• 2008

The total hip replacement (THR) has been used as the most effective way to restore the function of damaged hip joint. However, various factors have caused some side effects after the THR. Unfortunately, the success of the THR have been decided only by the proficiency of surgeons so far. Hence, It is necessary to find the way to minimize the side effect caused by those factors. The purpose of this study was to suggest the definite data, which can be used to design and choose the optimal hip implant. Using finite element analysis (FEA), the biomechanical condition of bone cement was evaluated. Stress patterns were analyzed in three conditions: cement mantle, procimal femur and stem-cement contact surface. Additionally, micro-motion was analyzed in the stem-cement contact surface. The 3-D femur model was reconstructed from 2-D computerized tomography (CT) images. Raw CT images were preprocessed by image processing technique (i.e. edge detection). In this study, automated edge detection system was created by MATLAB coding for effective and rapid image processing. The 3-D femur model was reconstructed based on anatomical parameters. The stem shape was designed using that parameters. The analysis of the finite element models was performed with the variation of parameters. The biomechanical influence of each parameter was analyzed and derived optimal parameters. Moreover, the results of FE A using commercial stem model (Zimmer's V erSys) were similar to the results of stem model that was used in this study. Through the study, the improved designs and optimal factors for clinical application were suggested. We expect that the results can suggest solutions to minimize various side effects.

• 한국정보과학회논문지:소프트웨어및응용
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• 제30권12호
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• pp.1247-1254
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• 2003

현재 경동맥 내막절제술 시행을 위한 경동맥 협착증의 정도 측정에는 디지털감산조영술(DSA), 회전조영술(rotational angiography), 컴퓨터단층조영술(CTA) 및 자기공명조영술(MRA)로부터 얻어진 경동맥의 투영 영상을 이용하여 북미, 유럽 표준 및 총경동맥 방법이 사용되고 있다. 본 논문에서는 기존의 기계적인 측경기를 이용하는 전형적인 경동맥 협착 측정 방법의 단점을 극복하고, 측정자간의 변화율을 최소화하기 위해 자기공명조영술의 단면 영상을 사용하고 컴퓨터화한 새로운 협착증 정도 측정 방법을 개발하였다. 영상 분할에 사용되는 방법중 가장 널리 사용되고 효율적인 명암값 임계치 방법을 사용하여 경동맥 및 동맥의 내강을 분할하였다. 또한, 각 증례의 측정된 총경동맥의 혈관두께를 사용하여 분할된 경동맥으로부터 혈관을 제거 하였고, 혈관이 제거된 경동맥을 혈류 영역과 플라그 영역으로 분할하였다. 각 단면 영상에서의 경동맥 협착증 정도 측정은 (분할된 플라그 영역/혈류영역 및 플라그를 합한 면적) * 100% 식으로 계산된다.

• Journal of Chest Surgery
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• 제42권6호
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• pp.792-795
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• 2009

폐 분리증은 비교적 드문 기형적 폐 질환이다. 이 질환에서 일반적인 화농성균의 폐 감염은 흔한 합병증일 수 있다. 저자들은 내엽성 폐분리증의 폐에 국한된 결핵 균의 감염 1예를 치험하고 보고한다. 내원 3년 전에 기관지 확장증으로 진단받은 40세의 남자 환자가 반복되는 소량의 객혈을 주소로 내원하였다. 흉부 CT 촬영상 좌하엽의 염증을 동반한 기관지 확장증 소견과 흉부 대동맥에서 기시되는 커다란 영양동맥이 발견되었다. 환자는 개흉술을 통한 좌하엽 절제술을 받았고 최종 병리학적 검사상 폐분리증의 폐에 국한된 결핵감염이 확인되었다. 수술 후 7일째부터 환자에게 항 결핵요법을 시작하였고 퇴원 후 외래에서 추적 관찰 중이다.

• 대한한방내과학회지
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• 제24권2호
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• pp.213-219
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• 2003

Objectives : This study was to investigated using National Institutes of Health Strokes Scale score in 36 patients with middle cerebral artery infarction and to enaluate prognosis. Method : The subjects oh this study were 36 patients who were admitted to the Wonkwang oriental medicine. Improving rate were measured by using the National Institutes of Health Strokes Scale score. Each patient was diagnosed with Brain Computerized Tomography, Magnetic Resonance Imaging and clinical observation. Results : There were significant results statistically between National Institutes of Health Strokes Scale score and middle cerebral artery territories. While sex, age, hypertension, diabetes mellitus and heart disease were not siginificant meaning statistically. Conclusions: Sex, age, hypertension, diabetes mellitus and heart disease were relevant factors in predicting the functional outcome in the patients with middle cerebral artery infarction. In this study, middle cerebral artery territory affects the functional outcome.

• 대한후두음성언어의학회지
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• 제24권1호
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• pp.51-54
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• 2013

False vocal fold hypertrophy caused by diverse pathologic lesion, such as laryngeal amyloidosis, laryngeal lipidosis, laryngocele, saccular cyst and sulcus vocalis. False vocal fold hypertrophy, however, is also caused laryngeal structure deformity, irrespective of pathologic lesions. In this article, we report some cases of false vocal fold hypertrophy caused by inward bowing of thyroid cartilage. At the clinic of the department of otorhinolaryngology in Gangnam Severance Hospital, with 3 male complained of hoarseness as subjects, and comfirmed of false vocal fold hypertrophy using the stroboscopy and larynx CT we checked vocal fold and laryngeal structure. Three patients with apparent hypertrophy of false vocal fold were investigated with computerized tomography (CT). In all patients, marked concavity of thyroid cartilage was revealed in CT scan at the level of the false vocal fold, and this deformity of the thyroid cartilage seemed to cause a protrusion of false vocal fold which taken as hypertrophy in stroboscopy. Careful palpation of the larynx and a CT scan taken at the level of the false vocal fold should be useful in determining whether hypertrophy of the false vocal fold is pathologic. For the next articles, It is necessary to discuss for the cause, diagnosis, treatment and prevention of inward bowing of thyroid cartilage.

• Geomechanics and Engineering
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• 제14권2호
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• pp.195-202
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• 2018

Many laboratory experiments on crack propagation under uniaxial loading and biaxial loading have been conducted in the past using transparent materials such as resin, polymethyl methacrylate (PMMA), etc. However, propagation behaviors of three-dimensional (3D) cracks in rock or rock-like materials under tri-axial loading are often considerably different. In this study, a series of true tri-axial loading tests on the rock-like material with two semi-ellipse pre-existing cracks were performed in laboratory to investigate the acoustic emission (AE) characteristics and propagation characteristics of 3D crack groups influenced by intermediate principal stress. Compared with previous experiments under uniaxial loading and biaxial loading, the tests under true tri-axial loading showed that shear cracks, anti-wing cracks and secondary cracks were the main failure mechanisms, and the initiation and propagation of tensile cracks were limited. Shear cracks propagated in the direction parallel to pre-existing crack plane. With the increase of intermediate principal stress, the critical stress of crack initiation increased gradually, and secondary shear cracks may no longer coalesce in the rock bridge. Crack aperture decreased with the increase of intermediate principal stress, and the failure is dominated by shear fracturing. There are two stages of fracture development: stable propagation stage and unstable failure stage. The AE events occurred in a zone parallel to pre-existing crack plane, and the AE zone increased gradually with the increase of intermediate principal stress, eventually forming obvious shear rupture planes. This shows that shear cracks initiated and propagated in the pre-existing crack direction, forming a shear rupture plane inside the specimens. The paths of fracturing inside the specimens were observed using the Computerized Tomography (CT) scanning and reconstruction.

• Journal of Yeungnam Medical Science
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• 제12권2호
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• pp.400-404
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• 1995

국소 결절성 과형성은 섬유성 격막에 의해 나누어지는 간세포와 Kupffer 세포의 결절로 이루어진 양성 종괴이다. 방사선학적으로 다른 종괴와 유사한 소견을 보이나 그 예후와 치료는 달라 감별이 요구된다. 저자들이 경험한 증례는 조영 후 영상을 조영전기영상과 조영후기영상으로 분리함으로써 종괴의 혈류형태를 관찰할 수 있는 급속조영 CT를 설시하여 감별진단에 도움을 받을 수 있었고 병리조직학적으로 국소 결절성 과형성으로 확인된, 급속조영 CT 설시 후 국내에서 보고되는 최초의 증례이다.

• Journal of Yeungnam Medical Science
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• 제26권1호
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• pp.49-55
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• 2009

Peritonitis is a serious problem in patients undergoing peritoneal dialysis. Rarely pneumatosis intestinalis can occur as a complication of this infectious process. Pneumatosis intestinalis is a potential life threatening condition with a challenging management. The mortality of peritoneal dialysis patients with pneumalosis intestinalis secondary to mesenteric ischemia is almost 100%. We describe a rare case of pneumatosis intestinalis in a peritoneal dialysis patient who developed Staphylococcus aureus peritonitis which was initially treated with appropriate antibiotics. Since initial response to therapy was not achieved, an abdominal computerized tomography was done which revealed a pneumatosis intestinalis. A laparotomy was performed and small bowel necrosis was seen. A segmental resection with ileostomy, jejunostomy was done. Though surgical treatment was performed, the patient died in 2 weeks after admission. Pneumocystitis intestinalis in peritoneal dialysis peritonitis is a uncommon complication which requires prompt evaluation to rule out mesenteric ischemia as it carries a high mortality and its management will be surgical.