Section: Other Grants and Activities
Participants : René Anxionnat, Marie-Odile Berger, Erwan Kerrien, Pierre Glanc.
The SOFA-InterMedS large-scale INRIA initiative (http://www.inria.fr/recherche/equipes/sofa-intermeds.en.html ) is a research-oriented collaboration across several INRIA teams, international research groups and clinical partners. Its main objective is to leverage specific competences available in each team to further develop the multidisciplinary field of Medical Simulation research.
Our action within the initiative takes place in close collaboration with both Alcove INRIA project-team in Lille and the Department of diagnostic and therapeutic interventional neuroradiology of Nancy University Hospital. We aim at providing in-vivo models of the patient's organs, and in particular a precise geometric model of the arterial wall. Such a model is used by Alcove team to simulate the coil deployment within an intracranial aneurysm. The associated medical team in Nancy, and in particular our external collaborator René Anxionnat, is in charge of validating our results.
In order to consolidate last year's results on blood vessel modeling as triangulated meshes, we focused on the first half of this year on validating our simulation results on real patient data. This involved designing a methodology that implied defining tests and describing clinical metrics. Our findings were presented in major conferences both in medicine  and medical imaging  .
One of the conclusions was that the current mesh model induces a very tight compromise to be made between real-time simulation and the physical realism of the coil behavior. On-going investigations concern using radial basis functions to build an implicit model of the blood vessels, with an emphasis on preserving the accuracy of the geometric model while improving simulation time.
ANR ARTIS (2009-2012)
Participants : Marie-Odile Berger, Erwan Kerrien, Ting Peng.
The main objective of this fundamental research project is to develop inversion tools and to design and implement methods that allows producing augmented speech from the speech sound signal alone or with video images of the speaker's face. The Magrit team is especially concerned with the development of procedures allowing the automatic construction of a speaker's model from various imaging modalities. This year, we have developed variational guided methods which allow the internal articulators of a speaker to be segmented from MRI images given the knowledge of these articulators for a reference speaker.
ANR Visac (2009-2012)
Participants : Marie-Odile Berger, Brigitte Wrobel-Dautcourt, Blaise Potard.
The ANR Visac is about acoustic-visual speech synthesis by bimodal concatenation. The major challenge of this project is to perform speech synthesis with its acoustic and visible components simultaneously. Within this project, the role of the magrit team is twofold. One of them is to build a stereovision system able to record synchronized audio-visual sequences at a high frame rate. Second, a highly realistic dense animation of the head must be produced. During this first year, the stereovision system was noticeably improved in order to make possible the recording of long audio-visual sequences. The acquired corpus has been processed in order to obtain a corpus of 3D faces.