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조영 전후의 폐 CT 영상 정합을 위한 특징 기반의 비강체 정합 기법
이현준,홍영택,심학준,권동진,윤일동,이상욱,김남국,서준범,Lee, Hyun-Joon,Hong, Young-Taek,Shim, Hack-Joon,Kwon, Dong-Jin,Yun, Il-Dong,Lee, Sang-Uk,Kim, Nam-Kug,Seo, Joon-Beom 대한의용생체공학회 2011 의공학회지 Vol.32 No.3
In this paper, a feature-based registration technique is proposed for pre-contrast and post-contrast lung CT images. It utilizes three dimensional(3-D) features with their descriptors and estimates feature correspondences by nearest neighborhood matching in the feature space. We design a transformation model between the input image pairs using a free form deformation(FFD) which is based on B-splines. Registration is achieved by minimizing an energy function incorporating the smoothness of FFD and the correspondence information through a non-linear gradient conjugate method. To deal with outliers in feature matching, our energy model integrates a robust estimator which discards outliers effectively by iteratively reducing a radius of confidence in the minimization process. Performance evaluation was carried out in terms of accuracy and efficiency using seven pairs of lung CT images of clinical practice. For a quantitative assessment, a radiologist specialized in thorax manually placed landmarks on each CT image pair. In comparative evaluation to a conventional feature-based registration method, our algorithm showed improved performances in both accuracy and efficiency.
이중에너지 컴퓨터 단층촬영을 통해 진단된 폐의 미세혈관종양색전증
박세정 ( Se Jeong Park ),조민수 ( Min Soo Cho ),김달용 ( Dal Yong Kim ),장선주 ( Sun Joo Jang ),홍윤기 ( Yoon Ki Hong ),이호수 ( Ho Su Lee ),오연목 ( Yeon Mok Oh ),서준범 ( Joon Beom Seo ),박환성 ( Hwan Sung Park ),백충희 ( Chung 대한결핵 및 호흡기학회 2012 Tuberculosis and Respiratory Diseases Vol.72 No.1
Although advances in multi-detector computed tomography (CT) technique make it possible to evaluate peripheral subsegmental pulmonary arteries, several studies have reported that small peripheral embolisms may still be missed. Recently, some reports demonstrated that dual-energy CT improved the capability to detect peripheral pulmonary embolism. We report a case of lymphoma presenting as disseminated microvascular pulmonary tumor embolism, detected by perfusion images using dual energy CT.