http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최영욱,박혜숙,김예슬,김희중,최재구 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.11
The purpose of this study was to investigate the effect of different acquisition parameters and to determine the optimal set of acquisition parameters of projection views (PVs) for the new developed digital breast tomosynthesis (DBT) system. The DBT imaging parameters were optimized using 32 different acquisition sets with six angular ranges (±5˚, ±10˚, ±13˚, ±17˚, ±21˚, and ±25˚) and eight projection views (5, 11, 15, 21, 25, 31, 41, and 51 prjections). In addition to the contrastto-noise ratio (CNR), the artifact spread function (ASF) was used to quantify the in-focus plane artifacts along the z-direction in order to explore the relationship between the acquisition parameters and the image quality. A commercially, available breast-mimicking phantom was imaged to qualitatively verify our results. Our results show that a wide angular range improved the reconstructed image quality in the z-direction. If a large number of projections are acquired, then the electronic noise may dominate the CNR due to reduce the radiation dose per projection. Although increasing angular range was found to improve the vertical resolution, due to greater effective breast thickness, the image quality of microcalcifications in the in-focus plane was also found not to be improved by increasing the noise. Therefore, potential trade-offs of these physical imaging properties must be considered to optimize the acquisition configuration of a DBT system. Our results suggest possible directions for further improvements in DBT systems for high quality imaging.
최영욱,박병철,김승호,김익동,김풍택,유영구 대한골절학회 1989 대한골절학회지 Vol.2 No.2
We Clinically analysed 10 cases of fractures of the neck of the talus which had been treated at the Department of Orthopedic Surgery, Kyungbook Nantional University Hospital from 1984 to 198B and the following results were obtained. 1. Of the 10 cases, Hawkins type I was 2 cases, type II, 4 cases and type g, 4 cases. 2. Avascular necrosis was developed in 7 cases. 1 of type I, 3 of type II and 3 of type III. 3. In all 6 cases with comminution at subtalar and medial aspect of talus, avascular necrosis was developed. 4. Hawkins sign was evident in the plane rcentgenogram from 5th weeks to 12th weeks(mean at 8th weeks) and we could diagnose the avascular necrosis of talar body at 9.3th weeks. 5. Bone scan was not a helpful diagnostic tool for the confirmation of the avascular necroisis of the talar body. 6. Absolute non-weight bearing is mandatory until solid union is obtamed and partial weight bearing with PTB brace is advisable after emergence of the sign of revascularization on the plane roentgenogram. 7. Of the 10 cases of the fracture of the neck of the talus, satisfactory results were obtained in 7 cases and of the 7 cases with avascular necrosis, relatively good results were in 5 cases.
崔英旭 인제대학교 1987 仁濟醫學 Vol.8 No.1
화학적 발암 물질로 알려진 N-methyl-N'-nitro-N-nitroguanidine과 7,12-dime-thylbenz[a]anthracene의 Chinese Hamster V79 세포에 대한 돌연변이 유발 작용에 있어 간세포 매개 여부를 관찰하였다. Liver cell-mediated mutagenesis assay has been stuided using V79 Chinese Hamster cells as target cells. In the absence of hepatocytes, N- methyl-N'-nitro-N-nitro-guanidine (MNNG)-induced ouabain-and 6-thigouanine-resistant mutants were increased in number which was dose-related. 7, 12-dimethylbenz [a] anthracene (DMBA) did not induce mutants which were resistant to the ouabain and 6-thioguanine. On the contrary, in the presence of intact hepatocytes, DMBA had produced the ouabain-and 6-thioguanine-resistant mutants proportionately as a function of concentration, but the mutagenic activity of MNNG was not affected by the co-cultivated intact hepatocytes. In summary, MNNG induces mutants on V79 Chinese Hamster cells by acting directly, and DMBa induces the mutagenic action on the V79 cells through the intermediate metabolities of the cocultivated hepatocytes.