Anderson Maciel

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Realistic mechanical models of biological soft tissues are a key issue to allow the implementation of reliable systems to aid on orthopedic diagnosis and surgery planning. We are working to develop a computerized soft tissues model for bio-tissues based on a mass-spring-like approach. In this work we present several experiments towards the parameterization(More)
Hepatectomies are resections in which segments of the liver are extracted. While medical images are fundamental in the surgery planning procedure, the process of analysis of such images slice-by-slice is still tedious and inefficient. In this work we propose a strategy to efficiently and semi-automatically segment and classify patient-specific liver models(More)
In this paper, we introduce a novel "dynamic point" algorithm for computing the interaction of a line-shaped haptic cursor and polygonal surface models which has a near constant complexity. The algorithm is applied in laparoscopic surgery simulation for interaction of surgical instruments with physics-based deformable organ models.
This paper addresses evaluation and visualization of stress and strain on soft biological tissues in contact. Given three-dimensional models of reconstructed organs from magnetic resonance images (MRI), we use an Anatomy-based kinematical model combined with a soft tissues model to represent their shape and behavior. Then, we compute resulting distribution(More)
The present paper describes the integration of a multi-finger haptic device with deformable objects in an interactive environment. Repulsive forces are synthesized and rendered independently for each finger of a user wearing a Cybergrasp force-feedback glove. Deformation and contact models are based on mass-spring systems, and the issue of the user(More)
PURPOSE Surgical simulations require haptic interactions and collaboration in a shared virtual environment. A software framework for decoupled surgical simulation based on a multi-controller and multi-viewer model-view-controller (MVC) pattern was developed and tested. METHODS A software framework for multimodal virtual environments was designed,(More)
In this paper, we present our spreadsheet framework, which uses a spreadsheet-like interface for exploring biomedical datasets. The principles and advantages of this class of visualization systems are illustrated, and a case study for the analysis of hip joint congruity is presented. Throughout this use case, we see how end users can compare different(More)
In many real life situations, people work together using each their own computers. In practice, besides personal communication, such situations often involve exchanging documents and other digital objects. Since people are working in a common physical space, it is a natural idea to enlarge the virtual space to a common area where they can exchange objects(More)