Carlos Santiago

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The segmentation of the left ventricle (LV) is an important task to assess the cardiac function in ultrasound images of the heart. This paper presents a novel methodology for the segmentation of the LV in three-dimensional (3-D) echocardiographic images based on the probabilistic data association filter (PDAF). The proposed methodology begins by(More)
Active shape models (ASM) have been extensively used in object segmentation problems because they constrain the solution , using shape statistics. However, accurately fitting an ASM to an image prone to outliers is difficult and poor results are often obtained. To overcome this difficulty we propose a robust algorithm based on the Expectation-Maximization(More)
Three-dimensional active shape models use a set of annotated volumes to learn a shape model. Using unique landmarks to define the surface models in the training set, the shape model is able to learn the expected shape and variation modes of the segmentation. This information is then used during the segmentation process to impose shape constraints. A(More)
The 3D segmentation of endocardium of the left ventricle (LV) in cardiac MRI volumes is a challenging problem due to the intrinsic properties of this image modality. Typically, the object shape and position are estimated to fit the observed features collected from the images. The difficulty inherent to the LV segmentation in MRI is that the images contain(More)
  • Sofia Raquel Pereira, Sousa Esménio, Jõ Ao, Pedro Estrela, Rodrigues Conde, Miguel Raposo +12 others
  • 2013
" I believe that whatever we do or live for has its causality; it is good, however, that we cannot see through to it. " Acknowledgments First of all, I would like to thank Prof. Jõ ao Miguel Sanches, for the opportunity of joining this project, and for all the guidance and support. I would also like to thank my co-supervisors Joana Figueiredo and Raquel(More)