Ara es mostren els items 1-20 de 104

    • 3D texture-based hybrid visualizations 

      Boada, Imma; Navazo Álvaro, Isabel (2003-01)
      Article
      Accés restringit per política de l'editorial
      In this paper, the visualization of hybrid scenes that contain volume data and a fitted extracted surface is addressed. The proposed algorithm is based on a integrated octree-based representation: the ‘‘hybrid octree.’’ ...
    • 3D triangular mesh to represent the left ventricle volume of the heart 

      Rodriguez, Lyudmila; Navazo Álvaro, Isabel; Vinacua Pla, Álvaro (2002-07-01)
      Report de recerca
      Accés obert
      This report describes an algorithm for the generation of unstructured tetrahedral meshes from two triangular meshes: the internal and external walls of an object. The tetrahedral mesh thus obtained represents the volume ...
    • A 3D System for training in endoscopical repair of subcondylar fractures of the mandible 

      Hueto, Joan A.; Díaz, José; Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau; Raspall, G. (Springer Verlag, 2008)
      Article
      Accés obert
      Poster Session: 12th Annual Conference of Iscas. Conventional treatment of the subcondylar fractures of the mandible is challenging because of the medial and anterior displacement of the condylar fragment and the limited ...
    • A 3D virtual model for training in endoscopical repair of subcondylar fractures of the mandible 

      Hueto, J.A.; Díaz Iriberri, José; Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau; Raspall, G. (2008-09)
      Article
      Accés restringit per política de l'editorial
      Conventional treatment of the subcondylar fractures of the mandible is challenging because of the medial and anterior displacement of the condylar fragment and the limited surgical field. Proximity of facial nerve, carotid ...
    • A hybrid rugosity mesostructure (HRM) for faster rendering of fine haptic detail 

      Theoktisto, Víctor; Fairén González, Marta; Navazo Álvaro, Isabel (2009)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      We propose a faster method for surface haptic rendering using image-based Hybrid Rugosity Mesostructures (HRMs), paired maps with per-face height eld displacements and normalmaps, which are layered on top of a much decimated ...
    • A hybrid rugosity mesostructure (HRM) for rendering fine haptic detail 

      Theoktisto Colmenares, Victor Arturo; Fairén González, Marta; Navazo Álvaro, Isabel (2009-02)
      Report de recerca
      Accés obert
      The haptic rendering of surface mesostructure (fine relief features) in dense triangle meshes requires special structures, equipment, and high sampling rates for detailed perception of rugged models. Some approaches simulate ...
    • A scalable approach to T2-MRI colon segmentation 

      Orellana Bech, Bernat; Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Brunet Crosa, Pere; Bendezú García, Álvaro; Azpiroz Vidaur, Fernando (2020-07-01)
      Article
      Accés obert
      The study of the colonic volume is a procedure with strong relevance to gastroenterologists. Depending on the clinical protocols, the volume analysis has to be performed on MRI of the unprepared colon without contrast ...
    • A survey of isosurface fitting algorithms 

      Boada Oliveras, Immaculada; Navazo Álvaro, Isabel (1998-03)
      Report de recerca
      Accés obert
      Implicit surface poligonalization is an useful technique for visualizing sampled volumetric data in many scientific applications. In this report we describe some of the different algorithms for constructing poligonazed ...
    • A topological comparison of surface extraction algorithms 

      Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Fairén González, Marta; Navazo Álvaro, Isabel; Vinacua Pla, Álvaro (2006-01)
      Report de recerca
      Accés obert
      In many application areas, it is useful to convert the discrete information stored in the nodes of a regular grid into a continuous boundary model. Isosurface extraction algorithms di er on how the discrete information in ...
    • A topological comparison of surface extraction algorithms 

      Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Fairén González, Marta; Navazo Álvaro, Isabel; Vinacua Pla, Álvaro (2021-10-22)
      Report de recerca
      Accés obert
      In many application areas, it is useful to convert the discrete information stored in the nodes of a regular grid into a continuous boundary model. Isosurface extraction algorithms differ on how the discrete information ...
    • A Volume Visualization Algorithm using a coherent Extended Weight Matrix 

      Tost Pardell, Daniela; Puig Puig, Anna; Navazo Álvaro, Isabel (1995-01)
      Article
      Accés restringit per política de l'editorial
      Direct cell-to-cell volume visualization algorithms, also called projective rendering methods, present the advantage of allowing semi-transparencies and, additionally, as they project all the samples, they avoid the ...
    • Abdominal distension after eating lettuce: the role of intestinal gas evaluated in vitro and by abdominal CT imaging 

      Barba, Elisabeth; Sánchez García, Borja; Burri, Emanuel; Accarino Garaventa, Anna María; Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Guarner Aguilar, Francisco; Margolles Barros, Abelardo; Azpiroz Vidaur, Fernando (John Wiley and Sons Ltd., 2019-08-11)
      Article
      Accés obert
      Background: Some patients complain that eating lettuce, gives them gas and abdominal distention. Our aim was to determine to what extent the patients' assertion is sustained by evidence. Methods: An in vitro study measured ...
    • Abdominothoracic mechanisms of functional abdominal distension and correction by biofeedback 

      Barba, Elizabeth; Burri, Emanuel; Accarino Garaventa, Anna María; Cisternas, Daniel; Quiroga, Sergi; Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Malagelada Benapres, Juan Ramon; Azpiroz Vidaur, Fernando (2015-04-01)
      Article
      Accés obert
      BACKGROUND & AIMS: In patients with functional gut disorders, abdominal distension has been associated with descent of the diaphragm and protrusion of the anterior abdominal wall. We investigated mechanisms of abdominal ...
    • Adaptive cross-sections of anatomical models 

      Díaz Iriberri, José; Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau (North-Holland, 2012-09)
      Article
      Accés restringit per política de l'editorial
      Medical illustrations have been used for a long time for teaching and communicating information for diagnosis or surgery planning. Illustrative visualization systems create methods and tools that adapt traditional illustration ...
    • Adaptive transfer functions: improved multiresolution visualization of medical models 

      Díaz García, Jesús; Brunet Crosa, Pere; Navazo Álvaro, Isabel; Pérez, Frederic; Vázquez Alcocer, Pere Pau (Springer, 2016-05-14)
      Article
      Accés obert
      Medical datasets are continuously increasing in size. Although larger models may be available for certain research purposes, in the common clinical practice the models are usually of up to 512x512x2000 voxels. These ...
    • An experimental study on the effects of shading in 3D perception of volumetric models 

      Díaz Iriberri, José; Ropinski, Timo; Navazo Álvaro, Isabel; Gobbetti, Enrico; Vázquez Alcocer, Pere Pau (Springer, 2017-01)
      Article
      Accés restringit per política de l'editorial
      Throughout the years, many shading techniques have been developed to improve the conveying of information in volume visualization. Some of these methods, usually referred to as realistic, are supposed to provide better ...
    • An octree isosurface codification based on discrete planes 

      Boada, Imma; Navazo Álvaro, Isabel (2001)
      Text en actes de congrés
      Accés obert
      Describes a method to code a decimated model of an isosurface on an octree representation while maintaining volume data if it is needed. The proposed technique is based on grouping the marching cubes (MC) patterns into ...
    • Automatic generation of exploration paths for medical models 

      Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau; Herrero Jover, Javier; López, Jordi (2008)
      Article
      Accés obert
      Although the visualization techniques are becoming faster and faster, the datasets also increase, and the time the radiologists are able to devote to a single analysis is limited. In this sense, we propose some techniques ...
    • Automatic generation of exploration paths for medical models 

      Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau; Herrero, Javier; López, Jordi (Springer Verlag, 2008)
      Article
      Accés obert
      In Supplement 1. Proceedings of the 22nd International Congress and Exhibition, Barcelona, Spain, June 25-28, 2008. Category: Image Processing and Display
    • Boolean operations between extended octrees 

      Ayala Vallespí, M. Dolors; Brunet Crosa, Pere; Navazo Álvaro, Isabel (1991)
      Report de recerca
      Accés obert
      This paper describes the Extended Octree model that are an exact representation for polyhedra. Boolean Operations in this model perform in linear time, as they include an implicit spacial localization of the objects. As a ...