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황혜성,김누리,정윤지,구은회,김기정,Hwang, Hyeseong,Kim, Nuri,Jeong, Yoonji,Goo, Eunhoe,Kim, Kijeong 대한디지털의료영상학회 2014 대한디지털의료영상학회논문지 Vol.16 No.2
Purpose: The purpose of this study has attempted to evaluate and compare the image evaluation and exposure dose by respectively applying Filtered Back Projection(FBP), the existing test method, and Adaptive Statistical Iterative Reconstruction(ASIR) with different values of tube voltage during the Low Dose Computed Tomography(LDCT). Materials and Methods: With the image reconstruction method as basis, Chest Phantom was utilized with the FBP and ASIR set at 10%, 20% respectively, and the change of Tube Voltage (100kVp, 120kVp). For image evaluation, Back ground noise, Signal to Noise ratio(SNR) and Contrast to Noise ratio(CNR) were measured, and, for dose evaluation, CTDIvol and DLP were measured respectively. The statistical analysis was tested with SPSS(ver. 22.0), followed by ANOVA Test conducted after normality test and homogeneity test. (p<0.05). Results: In terms of image evaluation, there was no outstanding difference in Ascending Aorta(AA) SNR and Infraspinatus Muscle(IM) SNR with the different values of ASIR application(p<0.05), but a significant difference with the different amount of tube voltage(p>0.05). Also, there wasn't noticeable change in CNR with ASIR and different amount of Tube Voltage (p<0.05). However, in terms of dose evaluation, CTDIvol and DLP showed contrasting results(p<0.05). In terms of CTDIvol, the measured values with the same tube voltage of 120kVp were 2.6mGy with No-ASIR and 2.17mGy with 20%-ASIR respectively, decreased by 0.43mGy, and the values with 100kVp were 1.61mGy with No-ASIR and 1.34mGy with 20%-ASIR, decreased by 0.27mGy. In terms of DLP, the measured values with 120kVp were $103.21mGy{\cdot}cm$ with No-ASIR and $85.94mGy{\cdot}cm$ with 20%-ASIR, decreased by $17.27mGy{\cdot}cm$(about 16.7%), and the values with 100kVp were $63.84mGy{\cdot}cm$ with No-ASIR and $53.25mGy{\cdot}cm$ with 20%-ASIR, a decrease by $10.62mGy{\cdot}cm$(about 16.7%). Conclusion: At lower tube voltage, the rate of dose significantly decreased, but the negative effects on image evaluation was shown due to the increase of noise. For the future, through the result of the experiment, it is considered that the method above would be recommended for follow-up patients or those who get health checkup as long as there is no interference on the process of diagnosis due to the characteristics of Low Dose examination.
황혜성 문화사학회 2013 역사와 문화 Vol.26 No.-
The Museum of the American Indian was founded by George Gustav Heye, a wealthy engineer and financier. Heye had collected more than 800,000 Indian objects since 1903 and established the Hey Foundation in 1916 and opened the Museum in 1922. In this study I has tried to relate Heye and the Museum to a larger historical context and to evaluate the Museum of American Indian as ‘a Colonial Museum.’ The late 19th century was the heyday of natural history and anthropology museums, and imperialism and colonialism brought to theses museums objects for study and exhibition in Europe as well as in America. Heye’s museum also modeled those anthropology museums, saying “its sole aim to gather and to preserve for students everything useful in illustrating... and to disseminate by means of its publications the knowledge thereby gained.” Add to these phenomena the 1890s had marked a turning point in the U. S. Indian policy from ‘removal and segregation’ to ‘assimilation’. This change in the policy brought along the assumption that the American Indians were vanishing and their culture was on the verge of extinction. This assumption eventually led Heye to the ‘collecting fever’ seeking out everything related to this ‘disappearing Indian.’ But Heye had little interest in contemporary Indians, it was their past that motivated him to collect. He seems to have embodied some of the larger society’s ambivalence toward American Indians at that time, simultaneously destroying and preserving Indian cultures.Therefore as a typical colonial museum, the Museum of American Indian can be said to be ‘the Museum of Others’, where collector(George Heye) exhibits Others’(Indians’) objects, without mentioning their societies drained of their essence, institutions undermined, land confiscated, religions smashed by white men. Heye made American Indian ‘things’ stuffed in the ‘frozen time.’