Now showing items 1-20 of 93

    • 3D texture-based hybrid visualizations 

      Boada, Imma; Navazo Álvaro, Isabel (2003-01)
      Article
      Restricted access - publisher's policy
      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)
      External research report
      Open Access
      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
      Open Access
      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
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      External research report
      Open Access
      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
      Restricted access - publisher's policy
      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 topological comparison of surface extraction algorithms 

      Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Fairén González, Marta; Navazo Álvaro, Isabel; Vinacua Pla, Álvaro (2006-01)
      External research report
      Open Access
      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 Volume Visualization Algorithm using a coherent Extended Weight Matrix 

      Tost Pardell, Daniela; Puig Puig, Anna; Navazo Álvaro, Isabel (1995-01)
      Article
      Restricted access - publisher's policy
      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
      Open Access
      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
      Open Access
      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
      Restricted access - publisher's policy
      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
      Open Access
      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
      Restricted access - publisher's policy
      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)
      Conference report
      Open Access
      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, Javier; López, Jordi (Springer Verlag, 2008)
      Article
      Open Access
      In Supplement 1. Proceedings of the 22nd International Congress and Exhibition, Barcelona, Spain, June 25-28, 2008. Category: Image Processing and Display
    • 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
      Open Access
      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 ...
    • Colonic content assessment from MRI imaging using a semi-automatic approach 

      Ceballos Inza, Víctor; Monclús Lahoya, Eva; Vázquez Alcocer, Pere Pau; Bendezú García, Álvaro; Mego Silva, Marianela; Merino Casabiel, Xavier; Azpiroz Vidaur, Fernando; Navazo Álvaro, Isabel (European Association for Computer Graphics (Eurographics), 2019)
      Conference report
      Open Access
      The analysis of the morphology and content of the gut is necessary in order to achieve a better understanding of its metabolic and functional activity. Magnetic resonance imaging (MRI) has become an important imaging ...
    • Colonic content in health and its relation to functional gut symptoms 

      Bendezú García, Álvaro; Barba, Elisabeth; Burri, Emanuel; Cisternas, Daniel; Accarino Garaventa, Anna María; Quiroga, Sergi; Monclús Lahoya, Eva; Navazo Álvaro, Isabel; Malagelada Benapres, Juan Ramon; Azpiroz Vidaur, Fernando (2016-02-12)
      Article
      Open Access
      Gut content may be determinant in the generation of digestive symptoms, particularly in patients with impaired gut function and hypersensitivity. Since the relation of intraluminal gas to symptoms is only partial, we ...
    • Colonic content: effect of diet, meals, and defecation 

      Bendezú García, Álvaro; Mego, Marianela; Monclús Lahoya, Eva; Merino, Xavi; Accarino Garaventa, Anna María; Malagelada Benapres, Juan Ramon; Navazo Álvaro, Isabel; Azpiroz Vidaur, Fernando (2017-01-29)
      Article
      Open Access
      The metabolic activity of colonic microbiota is influenced by diet; however, the relationship between metabolism and colonic content is not known. Our aim was to determine the effect of meals, defecation, and diet on colonic ...