Publications of David Cazier

Publications HAL de cazier de la structure shacra;mimesis

2016

Journal articles

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titre
Handling Topological Changes during Elastic Registration: Application to Augmented Reality in Laparoscopic Surgery
auteur
Christoph Joachim Paulus, Nazim Haouchine, Seong-Ho Kong, Renato Vianna Soares, David Cazier, Stéphane Cotin
article
International Journal of Computer Assisted Radiology and Surgery (IJCARS), Springer, 2016
resume
Purpose: Locating the internal structures of an organ is a critical aspect of many surgical procedures. Minimally invasive surgery, associated with augmented reality techniques, offers the potential to visualize inner structures, allowing for improved analysis, depth perception or for supporting planning and decision systems. Methods: Most of the current methods dealing with rigid or non-rigid augmented reality make the assumption that the topology of the organ is not modified. As surgery relies essentially on cutting and dissection of anatomical structures, such methods are limited to the early stages of the surgery. We solve this shortcoming with the introduction of a method for physics-based elastic registration using a single view from a monocular camera. Singularities caused by topological changes are detected and propagated to the pre-operative model. This significantly improves the coherence between the actual laparoscopic view and the model, and provides added value in terms of navigation and decision-making, e.g. by overlaying the internal structures of an organ on the laparoscopic view. Results: Our real time augmentation method is assessed on several scenarios, using synthetic objects and real organs. In all cases, the impact of our approach is demonstrated, both qualitatively and quantitatively. Conclusion: The presented approach tackles the challenge of localizing internal structures throughout a complete surgical procedure, even after surgical cuts. This information is crucial for surgeons to improve the outcome for their surgical procedure and avoid complications.
Accès au texte intégral et bibtex
https://hal.inria.fr/hal-01397409/file/ijcars2016.pdf BibTex

2015

Journal articles

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titre
Virtual Cutting of Deformable Objects based on Efficient Topological Operations
auteur
Christoph Paulus, Lionel Untereiner, Hadrien Courtecuisse, Stephane Cotin, David Cazier
article
Visual Computer, Springer Verlag, 2015, 31 (6-8), pp.831-841. <10.1007/s00371-015-1123-x>
resume
Virtual cutting of deformable objects is at the core of many applications in interactive simulation and especially in computational medicine. The ability to simulate surgical cuts, dissection, soft tissue tearing ormicro-fractures is essential for augmenting the capabilities of existing or future simulation systems. To support such features,we combine a new remeshing algorithm with a fast finite element approach. The proposed method is generic enough to support a large variety of applications. We show the benefits of our approach evaluating the impact of cuts on the number of nodes and the numerical quality of the mesh. These points are crucial to ensure accurate and stable real-time simulations.
Accès au texte intégral et bibtex
https://hal.archives-ouvertes.fr/hal-01162099/file/2015CGI.pdf BibTex
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titre
CPH: a compact representation for hierarchical meshes generated by primal refinement
auteur
Lionel Untereiner, Pierre Kraemer, David Cazier, Dominique Bechmann
article
Computer Graphics Forum, Wiley, 2015, 34 (8), pp.155-166. <10.1111/cgf.12667>
resume
We present CPH (Compact Primal Hierarchy): a compact representation of the hierarchical connectivity of surface and volume manifold meshes generated through primal subdivision refinements. CPH is consistently defined in several dimensions and supports multiple kinds of tessellations and refinements, whether regular or adaptive. The basic idea is to store only the finest mesh, encoded in a classical monoresolution structure that is enriched with a minimal set of labels. These labels allow traversal of any intermediate level of the mesh concurrently without having to extract it in an additional structure. Our structure allows attributes to be stored on the cells not only on the finest level, but also on any intermediate level. We study the trade-off between the memory cost of this compact representation and the time complexity of mesh traversals at any resolution level.
Accès au texte intégral et bibtex
https://hal.archives-ouvertes.fr/hal-01162098/file/ihm.pdf BibTex

Conference papers

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titre
Surgical Augmented Reality with Topological Changes
auteur
Christoph Paulus, Nazim Haouchine, David Cazier, Stéphane Cotin
article
Medical Image Computing and Computer Assisted Interventions, Oct 2015, München, Germany. <http://miccai2015.org/>
resume
The visualization of internal structures of organs in minimally invasive surgery is an important avenue for improving the perception of the surgeon, or for supporting planning and decision systems. However, current methods dealing with non-rigid augmented reality only provide augmentation when the topology of the organ is not modified. In this paper we solve this shortcoming by introducing a method for physics-based non-rigid augmented reality. Singularities caused by topo-logical changes are detected and propagated to the pre-operative model. This significantly improves the coherence between the actual laparascopic view and the model, and provides added value in terms of navigation and decision making. Our real time augmentation algorithm is assessed on a video showing the cut of a porcine liver’s lobe in minimal invasive surgery.
Accès au texte intégral et bibtex
https://hal.inria.fr/hal-01184498/file/2015MICCAI.pdf BibTex
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titre
Augmented Reality during Cutting and Tearing of Deformable Objects
auteur
Christoph Paulus, Nazim Haouchine, David Cazier, Stephane Cotin
article
The 14th IEEE International Symposium on Mixed and Augmented Reality, Sep 2015, Fukuoka, Japan. pp.6
resume
Current methods dealing with non-rigid augmented reality only provide an augmented view when the topology of the tracked object is not modified, which is an important limitation. In this paper we solve this shortcoming by introducing a method for physics-based non-rigid augmented reality. Singularities caused by topological changes are detected by analyzing the displacement field of the underlying deformable model. These topological changes are then applied to the physics-based model to approximate the real cut. All these steps, from deformation to cutting simulation, are performed in real-time. This significantly improves the coherence between the actual view and the model, and provides added value.
Accès au texte intégral et bibtex
https://hal.inria.fr/hal-01184495/file/2015ISMAR.pdf BibTex
titre
Virtual Cutting of Deformable Objects based on Efficient Topological Operations
auteur
Christoph Paulus, Lionel Untereiner, Hadrien Courtecuisse, Stéphane Cotin, David Cazier
article
Computer Graphics International, 2015, Strasbourg, France. 2015
resume
Virtual cutting of deformable objects is at the core of many applications in interactive simulation and especially in computational medicine. The ability to simulate surgical cuts, dissection, soft tissue tearing ormicro-fractures is essential for augmenting the capabilities of existing or future simulation systems. To support such features,we combine a new remeshing algorithm with a fast finite element approach. The proposed method is generic enough to support a large variety of applications. We show the benefits of our approach evaluating the impact of cuts on the number of nodes and the numerical quality of the mesh. These points are crucial to ensure accurate and stable real-time simulations.
Accès au bibtex
BibTex