Segmentation Active contours

Yushkevich PA, Piven J, Hazlett HC et al (2006) User-guided 3D active contour segmentation of anatomical structures significantly improved efficiency and reliability. Neuroimage 31 1116-28... 

Hua Li, Anthony Yezzi et al. (2005) Fast 3d brain segmentation using dual-front active contours with optional user-interaction. Computer Vision for Biomedical Image Applications 335-345... 

Keywords— Enhanced Distance Active Contour, Mammogram, Microcalcifications, Segmentation, Boundaries. 

Enhanced Distance Active Contour (EDAC) is introduced in order to solve the issue. In this paper, the efficiency of DAC and EDAC in segmenting characteristic details on breast phantom images is compared. In this study, the breast phantom is needed in order to test the applicability of EDAC, in the detection of the characteristic details hidden behind the phantom. The breast phantom refers to a test object used to simulate radiographic characteristics of compressed tissue. A phantom is designed to simulate x-ray attenuation of 4.2 cm compressed human breast which is composed of 50% adipose and 50% glandular tissue. Then, both methods are implemented on mammograms to segment microcalcifications [3]. Einally, the performance of both methods are measured and compared. This is to verify that the EDAC performs better than DAC. 

Efficiency of Enhanced Distance Active Contour (EDAC) for Microcalcifications Segmentation... 

The DAC also faces the same problem as the traditional Active Contour. It requires longer computational time to finish the segmentation process. Thus, some enhancement should be made to overcome this issue. The pseudo codes of the ED AC are illustrated in Figure 1 ... 

Some earlier segmentation methods are characterized as explicit. This means the front representing the boundary of the preliminary object is moved explicitly, point by point. A popular explicit segmentation method is the active contours, or snake method. As both these names indicate, the front (the contour) is active in crawling to find the true boundary. The points indicating the front are updated by a minimization of the energy formulation. More on theory and applications can be found in [2] and [8]. 

Early-time motion, for segments s such that UgM(s)activated exploration of the original tube by the free end. In the absence of topological constraints along the contour, the end monomer moves by the classical non-Fickian diffusion of a Rouse chain, with spatial displacement f, but confined to the single dimension of the chain contour variable s. We therefore expect the early-time result for r(s) to scale as s. When all prefactors are calculated from the Rouse model [2] for Gaussian chains with local friction we find the form... 

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