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Hough변환을 이용한 정자의 형태학적 특성 분석방법에 관한 연구
박광석,이원진,백재승,Park, Kwang-Suk,Yi, Won-Jin,Paick, Jae-Seung 대한의용생체공학회 1996 의공학회지 Vol.17 No.1
Hough변환을 이용하여 정자의 행태학적 특성을 분석하는 새로운 방법을 개발하였다. 이 방법은 정자의 머리부분이 주위의 배경과 밝기의 차이를 갖는다는 특성과 함께 그 형태가 타원에 근접한다는 특성에 근거하고 있다. 정자의 머리부분은 타원을 나타내는 5개의 파라메터로 표현되고, 최적의 파라메터 값이 반복적인 Hough 변환에 의하여 검출된다. 일차적으로 정자가 있는 영역을 선택한다. Hough변환을 이용한 계산을 가능하게 하기 위하여 Hough변환된 공간의 크기를 최소한으로 줄이고, 검출된 오차가 최소화되는 방향으로 검사영역을 이동 시켜가며 최적의 파라메터들을 도출한다. 형태학적 특성을 나타내는 지표들은 정자의 형태를 나타내는 타원의 다섯개 파라메터들로부터 계산된다. A new analytic method has been developed for the analysis of sperm morphology using Hough transform. This method is based on the characteristic that sperm heads have elliptic shape in addition to the density difference with the background Sperm heads are represented in elliptic form with five parameter, and the optimal parameters are estimated by iterative Hough transform. To reduce processing time practically, we restricted the transformed space in minimum volume and moved the searching volume to the maximum gradient for the estimated error. Morphological parameters were calculated from estimated sperm head boundaries without further processing.
최항문,이원진,허민석,이삼선,김정화,최순철,박태원,Choi Hang-Moon,Yi Won-Jin,Heo Min-Suk,Lee Sam-Sun,Kim Jung-Hwa,Choi Soon-Chul,Park Tae-Won 대한영상치의학회 2006 Imaging Science in Dentistry Vol.36 No.1
Purpose : To find the cause of root curvature by use of panoramic and lateral cephalometric radiograph. Materials and Methods : Twenty six 1st graders whose mandibular 1st molars .just emerged into the mouth were selected. Panoramic and lateral cephalometric radiograph were taken at grade 1 and 6, longitudinally. In cephalometric radio graph, mandibular plane angle, ramus-occlusal plane angle, gonial angle, and gonion-gnathion distance (Go-Gn distance) were measured. In panoramic radio graph, elongated root length and root angle were measured by means of digital subtraction radiography. Occlusal plane-tooth axis angle was measured, too. Pearson correlations were used to evaluate the relationships between root curvature and elongated length and longitudinal variations of all variables. Multiple regression equation using related variables was computed. Results : The Pearson correlation coefficient between curved angle and longitudinal variations of occlusal plane-tooth axis angle and ramus-occlusal plane angle was 0.350 and 0.401, respectively (p<0.05). There was no significant correlation between elongated root length and longitudinal variations of all variables. The resulting regression equation was $Y=10.209+0.208X_1+0.745X_2$ (Y: root angle, $X_1$: variation of occlusal plane-tooth axis angle, $X_2$: variation of ramus-occlusal plane angle). Conclusion : It was suspected that the reasons of root curvature were change of tooth axis caused by contact with 2nd deciduous tooth and amount of mesial and superior movement related to change of occlusal plane.
심훈섭,이원진,박광석,백재승,Shim, Hoon-Sup,Yi, Won-Jin,Park, Kwang-Suk,Paick, Jae-Seung 대한전자공학회 1994 전자공학회논문지-B Vol.b31 No.11
본 논문에서는 영상처리 방법을 이용하여 정자의 운동 특성을 분석하는 자동화된 방법을 개발하였다. 시스템의 구성은 별도의 전용 프로세서를 사용하지 않고 PC와 간단한 영상처리 보드로 이루어진다. 영상 처리 보드는 영상을 받아들이는 데 사용되며 PC는 영상을 처리한 다음 분석해서 정자의 운동 특성을 나타내 주는 특성 변수의 값을 계산한다. 분석 알고리듬으로서 중요한 것은 정자의 위치 검출 알고리듬과 정자의 운동 경로를 추적하는 Match matrix 방법이다. 분석한 결과를 수작업 방법 그리고 전용 프로세서를 이용하는 방법과 비교하여 신뢰할 만한 결과를 얻었다. In this paper, we developed an analyzing method of the motional characteristics of sperm, using image processing technology. Without the aid of a dedicated image-processor, this processing of a personal computer(PC) and a simple image processing board. The image processing board is used for acquiring images from a microscopic imaging source. The PC processes the images from the board and computes the parameters of motional characteristics of sperms. The algorithm of the site detection of sperms and the 'Match Matrix Method' is noteworthy. After comparing the results of our method with those of the manual method, and with those of the method using a dedicated image-processor, we concluded that our method is useful and reliable.
최진우,이원진,Choi, Jin-Woo,Yi, Won-Jin 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.4
Digital radiographic systems allow the implementation of a fully digital picture archiving and communication system (PACS), and provide the greater dynamic range of digital detectors with possible reduction of X-ray exposure to the patient. This article reviewed the basic physical principles of digital radiographic imaging system in dental clinics generally. Digital radiography can be divided into computed radiography (CR) and direct radiography (DR). CR systems acquire digital images using phosphor storage plates (PSP) with a separate image readout process. On the other hand, DR systems convert X-rays into electrical charges by means of a direct readout process. DR systems can be further divided into direct and indirect conversion systems depending on the type of X-ray conversion. While a direct conversion requires a photoconductor that converts X-ray photons into electrical charges directly, in an indirect conversion, lightsensitive sensors such as CCD or a flat-panel detector convert visible light, proportional to the incident X-ray energy by a scintillator, into electrical charges. Indirect conversion sensors using CCD or CMOS without lens-coupling are used in intraoral radiography. CR system using PSP is mainly used in extraoral radiographic system and a linear array CCD or CR sensors, in panoramic system. Currently, the digital radiographic system is an important subject in the dental field. Most studies reported that no significant difference in diagnostic performance was found between the digital and conventional systems. To accept advances in technology and utilize benefits provided by the systems, the continuous feedback between doctors and manufacturers is essential.
턱교정수술에서 3D simulation과 CAD/CAM의 활용
진임건(ImGeun Jin),양훈주(HoonJoo Yang),김대승(DeaSeung Kim),이원진(Won Jin Yi),황순정(Soon Jung Hwang) 대한치과의사협회 2012 대한치과의사협회지 Vol.50 No.11
We describes the process of 3D virtual treatment planning and of CAD/CAM for surgical splint in orthognathic surgery. The potential benefits and disadvantages of 3D virtual approach and the use of CAD/CAM system for the treatment of the patient with a maxillofacial deformity are discussed. For the more convenient applications,3D software should be improved.
방사선사진에서의 골질과 임상적으로 평가한 골질 분류의 상관관계
김현우,허경회,박관수,김정화,이원진,허민석,이삼선,최순철,Kim Hyun-Woo,Huh Kyung-Hoe,Park Kwan-Soo,Kim Jeong-Hwa,Yi Won-Jin,Heo Min-Suk,Lee Sam-Sun,Choi Soon-Chul 대한영상치의학회 2006 Imaging Science in Dentistry Vol.36 No.1
Purpose : To investigate the validity of digital image processing on panoramic radiographs in estimating bone quality before endosseous dental implant installation by correlating bone quality in radiographic images with clinical bone quality classification. Materials and Methods : An experienced surgeon assessed and classified bone quality for implant sites with tactile sensation at the time of implant placement. Including fractal dimension eighteen morphologic features of trabecular pattern were examined In each anatomical sites on panoramic radiographs. Finally bone quality of 67 implant sites were evaluated in 42 patients. Results : Pearson correlation analysis showed that three morphologic parameters had weak linear negative correlation with clinical bone quality classification showing correlation coefficients of -0.276, -0.280, and - 0.289, respectively (p<0.05). And other three morphologic parameters had obvious linear negative correlation with clinical bone quality classification showing correlation coefficients of -0.346, -0.488, and -0.343 respectively (p<0.05). Fractal dimension also had a linear correlation with clinical bone quality classification with correlation coefficients -0.506 significantly (p<0.05). Conclusion : This study suggests that fractal and morphometric analysis using digital panoramic radiographs can be used to evaluate bone quality for implant recipient sites.
구강검진의 효과 증진을 위한 파노라마방사선사진의 필요성에 관한 연구
신민정,최보람,허경회,이원진,허민석,이삼선,최순철,Shin, Min-Jung,Choi, Bo-Ram,Huh, Kyung-Hoe,Yi, Won-Jin,Heo, Min-Suk,Lee, Sam-Sun,Choi, Soon-Chul 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.1
Purpose : This study was designed to evaluate the efficacy and utility of panoramic radiograph for the improvement of the periodic oral examinations. Materials and Methods : Clinical examinations and panoramic examinations were done for the 242 subjects of oral examinations. The results of panoramic radiograph interpretation were compared with the clinical findings. Two questionnaires were created. One was carried out before the panoramic examination and the other done afterwards, to find out the subjects' cognition and satisfaction for the clinical and panoramic examinations. Results : 1. Panoramic findings showed a higher detection rate of 31.9% for periodontal diseases, and 23.1% for dental caries than clinical findings. 2. The additional abnormalities detected through panoramic examinations were impacted tooth in 81 subjects (33.6%), maxillary sinus abnormalities in 28 subjects (11.6%), condylar abnormalities in 5 subjects (2.1%), congenital and acquired dental anormalies in 59 subjects (24.5%), and other miscellaneous abnormalities in 34 subjects (14.1%). 3. 164 subjects (67.8%) were satisfied with the current periodic oral examination, and 75 subjects (31.1%) hoped for better accuracy. 4. In the first and second questionnaire, 154 subjects (67.0%) and 163 subjects (70.6%) responded respectively that panoramic examination was necessary, and 193 subjects (83.2%) responded that it actually helped. Conclusion : The panoramic examination was revealed to improve the effectiveness of the periodic oral examination and to increase the satisfaction of the subjects of examination.
결합조직형성 법랑모세포종의 방사선학적 소견 : 증례보고 3례
최다혜,허경회,문제운,이원진,허민석,이삼선,최순철,박관수,Choi Da-Hye,Huh Kyung-Hoe,Moon Je-Woon,Yi Won-Jin,Heo Min-Suk,Lee Sam-Sun,Choi Soon-Chul,Park Kwan-Soo 대한영상치의학회 2006 Imaging Science in Dentistry Vol.36 No.1
Desmoplastic ameloblastoma is a rare histologic variant of ameloblastoma. It shows important differences in anatomic distribution, histologic appearance, and radiographic findings compared with the general type of ameloblastoma. It is histologically characterized by an abundance of densely collagenous stroma and radiographically a mixed radiolucent-radiopaque lesion. We present three cases of desmoplastic ameloblastoma. All the patients complained on buccal swelling with or without pain and the sites of occurrence were the anterior and the premolar region. Plain radiographs showed mixed radiopaque-radiolucent lesion with ill-defined or diffuse sclerotic margin and no external root resorption. Additionally, CT scans revealetl buccal expansion and relatively well-defined margin of the lesions. The clinical and radiographic features of the presented cases were compared with those of the desmoplastic ameloblastoma in the previous literatures.