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Search Results: 1 - 10 of 4190 matches for " Christophe Marecaux "
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Comparison of linear and non-linear soft tissue models with post-operative CT scan in maxillofacial surgery
Matthieu Chabanas,Yohan Payan,Christophe Marecaux,Pascal Swider,Franck Boutault
Physics , 2006,
Abstract: A Finite Element model of the face soft tissue is proposed to simulate the morphological outcomes of maxillofacial surgery. Three modelling options are implemented: a linear elastic model with small and large deformation hypothesis, and an hyperelastic Mooney-Rivlin model. An evaluation procedure based on a qualitative and quantitative comparison of the simulations with a post-operative CT scan is detailed. It is then applied to one clinical case to evaluate the differences between the three models, and with the actual patient morphology. First results shows in particular that for a "simple" clinical procedure where stress is less than 20%, a linear model seams sufficient for a correct modelling.
Models for Planning and Simulation in Computer Assisted Orthognatic Surgery
Matthieu Chabanas,Christophe Marecaux,Yohan Payan,Franck Boutault
Physics , 2006,
Abstract: Two aspects required to establish a planning in orthognatic surgery are addressed in this paper. First, a 3D cephalometric analysis, which is clini-cally essential for the therapeutic decision. Then, an original method to build a biomechanical model of patient face soft tissue, which provides evaluation of the aesthetic outcomes of an intervention. Both points are developed within a clinical application context for computer aided maxillofacial surgery.
Computer aided planning and navigation for orbito-zygomatic reconstruction
Christophe Marecaux,Matthieu Chabanas,Yohan Payan,Franck Boutault
Physics , 2007,
Abstract: This paper suggests a full protocol of Computer Aided Surgery as previously recommended in literature addressing the challenging task of primary or secondary reconstruction of orbito-zygomatic dislocation. First, on a specifically developed planning software, the best zygoma reduction and orbital boundaries reconstruction to achieve skeletal symmetry are determined. This treatment plan is then transferred to the 3D Navigation Systems within the operating room. After patient's anatomy registration to his preoperative CT scan data, the navigation system allows zygomatic guiding to its planned reduced location and bone orbital volume restoration control. The feasibility of this technique was checked in 3 patients with major orbito-zygomatic deformities. Preliminary clinical results are presented.
Evaluating soft tissue simulation in maxillofacial surgery using pre and post-operative CT scan
Matthieu Chabanas,Christophe Marecaux,Franz Chouly,Franck Boutault,Yohan Payan
Physics , 2006,
Abstract: One of the most important issue in soft tissue modeling is to assess the quality of the simulations. A validation protocol is presented based on two CT scans of the patient acquired before and after cranio-maxillofacial surgery. The actual bones repositioning realized during the intervention are accurately measured and reproduced. A evaluation of the soft tissue deformation is then computed using a finite element model of the face. The simulations are therefore compared, qualitatively and quantitatively, with the actual outcome of the surgery. This protocol enable to rigorously evaluate different modeling methods, and to assess the clinical relevance of soft tissue simulation in maxillofacial surgery.
Computer aided planning for orthognatic surgery
Matthieu Chabanas,Christophe Marecaux,Yohan Payan,Franck Boutault
Physics , 2006,
Abstract: A computer aided maxillofacial sequence is presented, applied to orthognatic surgery. It consists of 5 main stages: data acquisition and integration, surgical planning, surgical simulation, and per operative assistance. The planning and simulation steps are then addressed in a way that is clinically relevant. First concepts toward a 3D cephalometry are presented for a morphological analysis, surgical planning, and bone and soft tissue simulation. The aesthetic surgical outcomes of bone repositioning are studied with a biomechanical Finite Element soft tissue model.
Computer-aided planning for zygomatic bone reconstruction in maxillofacial traumatology
Sylvain Maubleu,Christophe Marecaux,Matthieu Chabanas,Yohan Payan,Franck Boutault
Physics , 2006,
Abstract: An optimal planning procedure has been proposed to define the target position of the zygomatic bone following a fracture of the mid-face skeleton. The protocol has been successfully tested on healthy subjects, and ensures the global symmetry of the face could be obtained after the reconstruction surgery. Now that the planning procedure is available, the next step of this project will be to develop an intra-operative guiding system to help the surgeon to follow the planning. This procedure will mainly rely on the intra-operative registration of the zygomatic bone fragment, and the design of specific surgical ancillaries for cranio-maxillofacial surgery.
A biomechanical model of the face including muscles for the prediction of deformations during speech production
Julie Groleau,Matthieu Chabanas,Christophe Marecaux,Natacha Payrard,Brice Segaud,Michel Rochette,Pascal Perrier,Yohan Payan
Physics , 2008,
Abstract: A 3D biomechanical finite element model of the face is presented. Muscles are represented by piece-wise uniaxial tension cable elements linking the insertion points. Such insertion points are specific entities differing from nodes of the finite element mesh, which makes possible to change either the mesh or the muscle implementation totally independently of each other. Lip/teeth and upper lip/lower lip contacts are also modeled. Simulations of smiling and of an Orbicularis Oris activation are presented and interpreted. The importance of a proper account of contacts and of an accurate anatomical description is shown
Biomechanics applied to computer-aided diagnosis: examples of orbital and maxillofacial surgeries
Yohan Payan,Vincent Luboz,Matthieu Chabanas,Pascal Swider,Christophe Marecaux,Franck Boutault
Physics , 2006,
Abstract: This paper introduces the methodology proposed by our group to model the biological soft tissues deformations and to couple these models with Computer-Assisted Surgical (CAS) applications. After designing CAS protocols that mainly focused on bony structures, the Computer Aided Medical Imaging group of Laboratory TIMC (CNRS, France) now tries to take into account the behaviour of soft tissues in the CAS context. For this, a methodology, originally published under the name of the Mesh-Matching method, has been proposed to elaborate patient specific models. Starting from an elaborate manually-built "generic" Finite Element (FE) model of a given anatomical structure, models adapted to the geometries of each new patient ("patient specific" FE models) are automatically generated through a non-linear elastic registration algorithm. This paper presents the general methodology of the Mesh-Matching method and illustrates this process with two clinical applications, namely the orbital and the maxillofacial computer-assisted surgeries.
Maxillofacial computer aided surgery: a 5 years experience and future
Christophe Marecaux,Matthieu Chabanas,Vincent Luboz,Annaig Pedrono,Franz Chouly,Pascal Swider,Yohan Payan,Franck Boutault
Physics , 2006,
Abstract: This paper gives a review of the experience provided by our group in terms of computer aided maxillo-facial surgery.
How to Value GDP-Linked Collar Bonds? An Introductory Perspective  [PDF]
Christophe Schinckus
Theoretical Economics Letters (TEL) , 2013, DOI: 10.4236/tel.2013.33024
Abstract:

This short paper proposed a pricing method for GDP-linked collar bonds based on the classical discounted pricing model and the assumption that the GDP can be described with a geometric Brownian motion. The estimation of parameters was not discussed because it is not central in our numerical exercise.

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