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Automatic Polyp Detection in Pillcam Colon 2 Capsule Images and Videos: Prelimi...
Figueiredo, Pedro N.; Figueiredo, Isabel N.; Prasath, Surya; Tsai, RichardBackground. The aim of this work is to present an automatic colorectal polyp detection scheme for capsule endoscopy. Methods. PillCam COLON2 capsule-based images and videos were used in our study. The database consists of full exam videos from five patients. The algorithm is based on the assumption that the polyps show up as a protrusion in the captured images and is expressed bymeans of a P-value, defined by g...
A coupled convection-diffusion level set model for tracking epithelial cells in...
Figueiredo, Isabel N.; Leal, Carlos; Leonori, Tommaso; Romanazzi, Giuseppe; Figueiredo, Pedro N.; Donato, M. ManuelColorectal cancer is initiated in colonic crypts as a consequence of alterations leading to the disruption of the normal colonic cellular process. We propose a new model, which couples a convection-di usion type equation with a level set equation, for tracking the time evolution of an epithelial cell set, inside a colonic crypt, until it reaches the top of the crypt. The convection-di usion equation describes t...
A mathematical model for a comprehensive approach to the dynamics of human colo...
Figueiredo, Isabel N.; Figueiredo, Pedro N.; Leal, Carlos; Urbano, José MiguelIn this paper, we propose mathematical models for the growth dynamics of aberrant crypt foci in the human colon, as well as for some of their characteristics, namely the apoptosis and proliferation indices. The models rely on logistic type differential equations and clinical observations at different times, and can arguably be used as an auxiliary screening tool for colon cancer. We report several results using...
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