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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.
심소현 ( Sohyun Sim ),정윤지 ( Yoonji Jeong ),이병권 ( Byeonggwon Lee ),이창환 ( Changhwan Yi ),엄기현 ( Kyhyun Um ),조경은 ( Kyungeun Cho ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
최근 NUI 를 기반으로 하는 소환현실 연구가 활발하다. 일반적으로 소환현실 실험을 위해서는 소환현실 환경을 구축하는데, 이는 다양한 센서 장비와 출력 장비를 사용하므로 구축비용이 많이 소요된다. 본 논문에서는 이러한 어려움을 해소하기 위해 가상 시뮬레이션을 제안한다. 제안한 소환 현실 시뮬레이터를 설계하고, 구현한 결과 팔 동작 인식 시뮬레이션이 가능했다.
와르다익람 ( Warda Ikram ),정윤지 ( Yoonji Jeong ),이병권 ( Byeonggwon Lee ),엄기현 ( Kyhyun Um ),조경은 ( Kyungeun Cho ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
본 논문에서는 e-러닝 시스템 및 직관적인 제스처를 제안한다. e-러닝 시스템은 휴대가 쉽고 비용효율성이 높은 모션센서를 사용하며, 학생이 사용하기 쉽게 직관적인 제스처와 간단한 인터페이스 구성에 초점을 맞추었다. 시스템 속 시각적 효과와 재미있는 그래픽은 학생들의 관심을 끌어 학습에 흥미를 높여주고 학습 능력을 향상시킬 수 있다.