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29세 남자에서 다발성 낭종성 병변으로 진행한 폐선암 1예
이현성 ( Hyun Seong Lee ),전재완 ( Jae Wan Jeon ),김재희 ( Jae Hee Kim ),주형욱 ( Hyeong Uk Ju ),배중기 ( Joong Gi Bae ),민영주 ( Young Ju Min ),안종준 ( Jong Joon Ahn ),서광원 ( Kwang Won Seo ),제갈양진 ( Yangjin Jegal ),권운정 ( 대한결핵 및 호흡기학회 2012 Tuberculosis and Respiratory Diseases Vol.72 No.2
Cystic lesions or progressive cystic changes in adenocarcinoma of the lung have rarely been reported. We report a case of lung adenocarcinoma that progressed from ground-glass opacities (GGOs) and consolidations or nodules to extensive cystic lesions during 12 months in a young adult patient. A 29-year-old male was initially diagnosed with primary lung adenocarcinoma by transbronchial lung biopsy of the right lower lobe and lung to lung metastasis in both lungs according to imaging findings. The initial chest computed tomography (CT) scans showed multifocal GGOs, consolidations, and nodules in both lungs. Despite treatment with palliative chemotherapy, the patient`s follow-up CT scans showed multiple, cystic changes in both lungs and that the lesions had progressed more extensively. He died of hypoxic respiratory failure one year after his diagnosis.
이현성(Hyun Seong Lee),승명균(Myung Kyun Sung),김흥수(Heung Soo Kim) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.4
본 논문에서는 고무 부싱의 등가 강성이 가진 크기와 가진 주파수에 따라 달라지는 동특성에 대해 연구하였다. 새로운 모델은 고부 부싱의 대변형 거동과 크기 효과를 설명하기 위해 제안하였다. 제안된 제안된 모델은 탄성(Elastic) 요소, 점성(Viscous) 요소, 마찰(Friction) 요소로 이루어진 응력항과 등가변형률로 구성되어 있다. 제안된 모델은 실험 결과를 통해 검증하였다. 실험 검증을 통해 제안된 모델은 다양한 가진 크기와 가진 주파수에 따른 고무 부싱의 등가 강성을 정확히 예측함을 확인할 수 있다. 제안된 모델은 자동차 산업에서 고무 부싱의 동적 등가강성을 예측하는데 사용할 수 있을 것으로 예상한다. In this paper, the amplitude and frequency dependent dynamic characteristics of the equivalent stiffness of a rubber bushing are investigated. A new mathematical model is proposed to explain the large deformation and size effect of a rubber bushing. The proposed model consists of elastic, viscous, and frictional stress components and the equivalent strain. The proposed model is verified using experimental results. The comparison shows that the proposed model can accurately predict the equivalent stiffness values of a rubber bushing under various magnitudes and frequencies. The developed model could be used to predict the dynamic equivalent stiffness of a rubber bushing in automotive engineering.
MDCT을 이용한 Cardica CT 검사에서 ECG-pulsing기능의 사용 경험 및 고찰
박현(Hyeok Park),이현성(Hyun Seong Lee),김태성(Tae Seong Kim),안인현(In Hyun An),최남길(Nam Kil Choi) 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1
Purpose Cardiac CT comparing with other region’s same scan range very much radiation dose. so, I wanted to know the method which can reduce radiation dose through the effective methode of ECG-pulsing method. Materials and Methods I performed the test of patients which were prescribed for Cardiac CT because of chest pain, etc. I measured patients’ heart rate before the test. When their heart rate was more than 65 times, I used the ‘B-Blocker and I analyzed the use probability and success rates of ECG-pulsing, DPL and the optimum image reconstruction data. Results Among the 200 patients, I used the ECG-pulsing in 136 cases (68%) and DPL (mSv-cm) value was from 513 to 836 (mean value : 649). Ca scoring was from 44 times to 65 times (the mean : 57 times) in HR and from 36 times to 69 times (the mean : 53 times) in CTA. I didn’t use the ECG-pulsing in 62 cases (32%). DPL (mSv-cm) value was from 922 to 1320 and mean value was 1074. Ca scoring was from 53 times to 90 times (the mean : 66 times) in HR and from 38 times to 73 times (the mean : 59 times) in CTA. I didn’t the ECG-pulsing method because when I got the Ca scoring data, mostly BPM’s maximum was more than 64 (46cases, 73%). Image reconstruction R-R interval was shown from 65% to 69%. Conclusion When I used the ECG-pulsing method, DPL dose decreased by 39.6% than I didn’t use that. With the recent development of CT equipment, I recommend much use of the ECG-pulsing method because I think that the use of ECG-pulsing method has radiation dose decreased without a drop in image quality through the supplement of diverse ECG-pulsing methods and the maximum use of ECG-pulsing in fast CT.
급성 뇌경색 환자의 관류 CT 검사 시 심방세동이 영상에 미치는 영향
홍설화(Seol Hwa Hong),문일봉(Il Bong Moon),이현성(Hyun Seong Lee),범희남(Hui Nam Beom),전주섭(Ju Seob Jeon) 대한CT영상기술학회 2012 대한CT영상기술학회지 Vol.14 No.2
I. Purpose Atrial fibrillation(A-fib) is the most common symptom at the arrhythmia. The purpose of this study was to evaluate the possibility that atrial fibrillation(A-fib) could degrade of image of Perfusion CT(PCT) on Acute Cerebral Infarction(ACI) patients. II. Meterial and Methods From January to December 2011, We had evaluated 76patient who were suspected ACI and underwent PCT at C Hospital emergency department. The patient were divided into two groups according to the A-fib(n=36), non A-fib(n=36). Heart rate was classified 2 parts Controlled Ventricular Response(CVR) and Rapid Ventricular Response(RVR) (60<HR<100.HR>100) Then we analyzed that A-fib could effect to PCT image according to heart rate. III. Result CT the 76 patients who had a ACI, 38 patients had been observed A-fib and 38 patients had not been observed. The time density curve(TDC) of A-fib groups and None A-fib groups were evaluated one-way ANOVA. We analyzed that threshold time, peak time, threshold Hounsfield Unit(HU), peak time HU, The results of analysis is that: threshold time(p=0.006), and peak time(p=0.001) were significanted. But threshold HU(p=0.517), peak HU(p=0.927) were not significanted. IV. Conclusions Therefore before PCT scan, CT Radiological technologist should recognize that the patient has A-fib or not, and scan carefully. 목적 관류 CT 영상의 질 저하의 원인 중 하나로, 부정맥에서 가장 흔한 증상인 심방세동일 가능성에 대해 연구하고, 관류 CT 영상에 얼마만큼 영향을 미치는지 알아보고자 하였다. 대상과 방법 2009년 1월부터 2011년 12월까지 C대학교 병원 응급센터에 급성 뇌경색으로 의심되어 뇌 관류 CT를 촬영한 157명의 환자 중 적응증이 된 76명의 환자를 대상으로 하였다. 심방세동 환자군이 뇌 관류 CT 영상에 영향을 주는지 확인하기 위해, 정상군과 심박동수에 따른 Controlled Ventricular Response(CVR), Rapid Ventricular Response(RVR)로 분류하여 분석하였다. 결과 급성 뇌경색 환자에서 심방세동이 관찰된 그룹과, 심방세동이 관찰되지 않은 그룹은 각각 38명이었다. 심방세동이 관찰되지 않은 대조군, CVR, RVR의 TDC에서 threshold time, peak time, threshold Hounsfield Unit(HU), peak time HU를 통계학적으로 비교 분색한 결과, threshold time과 peak time에서 각각 P-value 값이 0.006과 0.001로 유의한 차이를 보였고(P<0.05), threshold HU와 peak time HU는 각각 0.517과 0.927로 통계학적 유의한 차이는 없었다. 결론 뇌 관류 CT 검사 전에 방사선사는 심방세동 유무를 잘 확인하여 영상에 대한 문의 시 적절한 대처를 할 수 있어야 할 것으로 사료된다.