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- 저자 : 김인원 (검색결과 199 건)
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김인원 대한영상의학회 1987 대한영상의학회지 Vol.23 No.4
The study was to evaluate the reliability and limitation of the CT number through determining the range of variation of CT number under a variety of different conditions using experimental models. Three cylindrical phantom models containing lesion-simulating-rods were used. After filling the different-density-solutions within the phantoms, the computed tomography was performed under a variety of different conditions in order to demonstrate the variability of CT number of the same lesion. The CT number of the rods within the phantom models was measured and analyzed. RESULTS : 1. The CT number of the lesion proportionately increased as the CT number of surround increased, and the increase of the CT number of the lesion showed linear response to the increase of the CT number for the same lesion regardless ofthe change of surround. 2. Time interval, change of mAs, or slice thickness had no effect on the CT number of the lesion. 3. The CT number of the lesions tended to vary wider n the body model tan the head model. 4. The range of the CT number variation increased as the lesion decreased in size, and it was more pronounced as the difference between the CT number of the lesion and surround increased. The above results suggest that CT number should be carefully used for diagnosis with consideration of its variability under a variety of different conditions.
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김인원 대한영상의학회 1992 대한영상의학회지 Vol.28 No.2
MR imaging of the brain in 34 patients were reviewed to characterize the MR findings of brain damage due to perinatal hypoxic insult All the patients had a history of perinatal hypoxia and showed abnormal brain MR findings. Out of 34, eight infants were born promature and twenty-six were born at term or post-term. MR findings were analysed for the extent and location of abnormalities of the white matter. cortical abnormality. corpus callosum atrophy, and abnormal progression of myelination. The major abnormalities were abnormal signal lesions or atrophy of the cerebral white matter and gyral atrophy of the cerebral cortex. The distribution of white matter lesions well correlated with maturity of the brain at the time of hypoxic insult. Periventricular and deep white matter lesions predominated in the premature-born patients. Corpus callosum atrophy was frequently seen. reflecting the location of white matter injury. Delay in myelination was present in 55%. MR is a very useful iagnostic imaging modality and guide for the prediction of prognosis by accurate depiction of the location and extent of brain damage due to perinatal hypoxic insult.
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김인원,최병인,김주완 대한영상의학회 1981 대한영상의학회지 Vol.17 No.2
The study was undertaken to evaluate the radiological and microscopic findings of radiation penumonitis. All 50 rats, which used for the experiment, received a single dose of 2,000 rads of radiation on right lung using 60 Co teletherapy. Chest teleroentgenograms were checked weekly for 13 weeks and microscopic examinations of irradiated lung were performed monthly after irradiation. The results obtained are summerized as follows. 1. In roentgenologic examination, radiation pneumonitis began to appear 4 weeks after irradiation and progressed with time intervals and began to resolve after 11 weeks. 2. Chest roentgenologic findings were pneumonic consolidation, atelectasis, and pleural effusion of irradiated right lung with compensatory hyper-inflation of left lung. 3. In the microscopic examination, pneumonitis appeared 2 weeks after irradiation and progressed with time intervals and began resolve after 8 weeks. 4. The microscopic findings were fibrin deposit in alveoli and in reased septal cellularity, vascular thickening , edema and congestion. After septal fibrosis and hyperplasia of bronchial mucosa, suggesting early regenerative change of radiation fibrosis, were noted 12 weeks after irradiation.
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김인원 대한영상의학회 1979 대한영상의학회지 Vol.15 No.2
Advances in fiberoptic duodenoscopy permit direct observation of interior of the duodenum and cannulation of the ampulla of Vater, and to perform endoscopic retrograde cholangiopancreatography. Authors analized the 30 cases of E.R.C.P. done at the Department of Radiology, Seoul National University Hospital between Feb. and Aug. 1979, which were compared with the final diagnosis. The results are as follows; 1. Out of 30 cases, successful visualization of the duct of concern was achieved in 23 cases. 2. Out of 10 cases of suspected pancreatic disease, pancreatic duct was visualized in 7 cases, and 5 cases revealed pathognomonic findings. All 5 cases were diagnosed as pancreatic cancer and their findings were encasement, local dilatation, poor filling and obstruction of pancreatic duct accompanying C.B.D. obstruction or stenosis, so called double dubt sign. 3. Out of 19 cases of suspected biliary tract disease, biliary tract was visualized in 16 cases and 14 cases revealed sugges ive abnormal findings. In biliary stones, filling defect with proximal dilatation and obstruction were noted. 4. Post-E.R.C.P. complications were vague abdominal pain, asymptomatic hyperamyasemia, elevated amylase clearance ratio and symptoms due to premedication or post-E.R.C.P. antibiotics therapy. Elevated serum amylase concentration or clearance ratio were within normal range and it dose not seem to have clinical significance.
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Study of metal cation selectivity by alkyl chain length between 1,2,3- triazole and spiropyran
김인원,이민혜,사디시쿠마르,이주현,송창식 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Spiropyran (SP) is an important class of photochromic molecule. Under UV light irradiation, the closed form of SP can be converted into the open merocyanine (MC) form through spiro cleavage and the MC form can retain to their original SP form under visible light irradiation. In this study, we design and synthesize triazole linked spiropyran compounds by click reaction. In this opportunity, we present the synthesis of two metal binding site SP and 1,2,3-triazole linked through different length of alkyl chain. The reversible interconversion between the SP and MC form can attain by metal cations without any external stimuli. According to this phenomenon, SP is able to utilize as metal cations sensor. We find that different alkyl chain length between SP and 1,2,3-triazole can effect on selectivity of our metal sensor system.
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