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CT절편두께와 RP방식이 3차원 의학모델 정확도에 미치는 영향에 대한 연구
엄기두,이병도 大韓口腔顎顔面 放射線學會 2004 Imaging Science in Dentistry Vol.34 No.1
Purpose : This study was to evaluate the influence of slice thickness of computed tomography (CT) and rapid protyping (RP) type on the accuracy of 3-dimensional medical model. Materials and Methods : Transaxial CT data of human dry skull were taken from multi-detector spiral CT. Slice thickness were 1, 2, 3 and 4 mm respectively. Three-dimensional image model reconstruction using 3-D visualization medical software (V-works^(TM) 3.0) and RP model fabrications were followed. 2-RP models were 3D printing (Z402, Z Corp., Burlington, USA) and stereolithographic Apparatus model. Linear measurements of anatomical landmarks on dry skull, 3-D image model, and 2-RP models were done and compared according to slice thickness and RP model type. Results : There were relative error percentage in absolute value of 0.97, 1.98, 3.83 between linear measurements of dry skull and image models of 1, 2, 3 mm slice thickness respectively. There was relative error percentage in absolute value of 0.79 between linear measurements of dry skull and SLA model. There was relative error difference in absolute value of 2.52 between linear measurements of dry skull and 3D printing model. Conclusion : These results indicated that 3-dimensional image model of thin slice thickness and stereolithographic RP model showed relative high accuracy.
이미선,엄기두,이은희,이경민,민진영,하태규,손미아,김상섭,백도명,박강원 서울大學校 保健大學院 2001 보건학논집 Vol.38 No.1
OBJECTIVES: This study was done to describe the pattern of childhood injury among general population and examine the risk factors. METHODS: The data were collected from 1870 children aged 5-6 years attending daycare centers in Seoul city. RESULTS: We found that the accident rate of participants aged 5-6 years was 29.9% and male to female accident ratio 1.6: 1. We could confirm that sex significantly associated with injury occurrence(p<0.0001). The mother and kindergarden as being a main protector were significantly associated with lower risk of injury. The injury was higher in summer. CONCLUSIONS: The results from this study provide evidence that the presence of certain home hazards is more important in predicting child injury. To tackle the problem of child injuries, a holistic approach is suggested. This includes the pruvision of a safe environment, supervision by parents, education of children and detailed data collection.
이병도,윤영남,엄기두,나종일,이완,Lee Byeong-Do,Yoon Young-Nam,Um Ki-Doo,Ra Jong-Ill,Lee Wan 대한영상치의학회 2002 Imaging Science in Dentistry Vol.32 No.2
Ankylosis of joint is defined as limited movement due to infection, trauma, or surgical procedure. A 59-year-old female with a chief complaint of limited movements during mouth opening had a positive history of trauma to her right TMJ area about 5 years ago. From that time, progressive mouth opening limitation and intermittent pain have occurred. At the time of admission the patient showed mandibular deviation to the right side during mouth opening, with a maximum opening limited to 5 mm. On plain radiographs, right condylar enlargement and joint space reduction by newly formed bony tissues were observed. CT scans showed right condylar enlargement, cortical sclerosis, and thickening of the condyle, articular fossa and articular eminence.
이은희,이경민,이미선,엄기두,공정옥,민경복,백도명,박강원 서울대학교 보건대학원 2001 서울大學校 保健環境硏究所論叢 Vol.11 No.1
Visual acuity impairment among children can lead to learning and behavioral disabilities. This study was carried out to describe the prevalence and risk factors of visual acuity impairment in Korean preschool children. Subject of this study was aged 4-6 children (n=2179) attending nursery and day-care centers of one district of Seoul City. The children were examined with Standard Visual Chart with diagrams familiar to children. If the visual acuity was equal to or less than 0.6, then it was described as impaired visual acuity. Age and sex were examined as for their associations with impaired visual acuity together with indicators of physical developments such as height, weight, and hemoglobin concentration. Based on the multiple logistic regression using SAS v 8.02, age and low birth weight were significant risk factors for impaired visual acuity, while other factors including parent's smoking history, housing environment, breast feeding history or diet habit were not. The results of this study indicate the importance of fetal environment/experiences in preventing impaired visual acuity. Possible role of incubators for low birth weight babies should also be considered.