Matthieu Chabanas - Academia.edu (original) (raw)

Papers by Matthieu Chabanas

Research paper thumbnail of Maxillofacial computer aided surgery: a 5 years experience and future

Eprint Arxiv Physics 0610205, Oct 24, 2006

This paper gives a review of the experience provided by our group in terms of computer aided maxi... more This paper gives a review of the experience provided by our group in terms of computer aided maxillo-facial surgery.

Research paper thumbnail of Biomechanics applied to computer-aided diagnosis: examples of orbital and maxillofacial surgeries

Eprint Arxiv Physics 0610180, Oct 22, 2006

This paper introduces the methodology proposed by our group to model the biological soft tissues ... more 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.

Research paper thumbnail of Computer aided planning for orthognatic surgery

Eprint Arxiv Physics 0610213, Oct 24, 2006

A computer aided maxillofacial sequence is presented, applied to orthognatic surgery. It consists... more 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.

Research paper thumbnail of A Continuous Biomechanical Model of the Face: A Study of Muscle Coordination for Speech Lip Gestures

Research paper thumbnail of Biomechanical models to simulate consequences of maxillofacial surgery

This paper presents the biomechanical finite element models that have been developed in the frame... more This paper presents the biomechanical finite element models that have been developed in the framework of the computer-assisted maxillofacial surgery. After a brief overview of the continuous elastic modelling method, two models are introduced and their use for computer-assisted applications discussed. The first model deals with orthognathic surgery and aims at predicting the facial consequences of maxillary and mandibular osteotomies. For this, a generic three-dimensional model of the face is automatically adapted to the morphology of the patient by the mean of elastic registration. Qualitative simulations of the consequences of an osteotomy of the mandible can thus be provided. The second model addresses the Sleep Apnoea Syndrome. Its aim is to develop a complete modelling of the interaction between airflow and upper airways walls during respiration. Dynamical simulations of the interaction during a respiratory cycle are computed and compared with observed phenomena.

Research paper thumbnail of Orbital and Maxillofacial Computer Aided Surgery: Patient-Specific Finite Element Models To Predict Surgical Outcomes

Comput Methods Biomech Biomed, Jun 16, 2006

This paper addresses an important issue raised for the clinical relevance of Computer-Assisted Su... more This paper addresses an important issue raised for the clinical relevance of Computer-Assisted Surgical applications, namely the methodology used to automatically build patient-specific Finite Element (FE) models of anatomical structures. From this perspective, a method is proposed, based on a technique called the Mesh-Matching method, followed by a process that corrects mesh irregularities. The Mesh-Matching algorithm generates patient-specific volume meshes from an existing generic model. The mesh regularization process is based on the Jacobian matrix transform related to the FE reference element and the current element. This method for generating patient-specific FE models is first applied to Computer-Assisted maxillofacial surgery, and more precisely to the FE elastic modelling of patient facial soft tissues. For each patient, the planned bone osteotomies (mandible, maxilla, chin) are used as boundary conditions to deform the FE face model, in order to predict the aesthetic outcome of the surgery. Seven FE patient-specific models were successfully generated by our method. For one patient, the prediction of the FE model is qualitatively compared with the patient's post-operative appearance, measured from a Computer Tomography scan. Then, our methodology is applied to Computer-Assisted orbital surgery. It is, therefore, evaluated for the generation of eleven patient-specific FE poroelastic models of the orbital soft tissues. These models are used to predict the consequences of the surgical decompression of the orbit. More precisely, an average law is extrapolated from the simulations carried out for each patient model. This law links the size of the osteotomy (i.e. the surgical gesture) and the backward displacement of the eyeball (the consequence of the surgical gesture).

Research paper thumbnail of Méthodologie de modélisation biomécanique des tissus du vivant pour la planification de gestes chirurgicaux

Ce papier vise à introduire la méthodologie de modélisation biomécanique retenue au sein de l'équ... more Ce papier vise à introduire la méthodologie de modélisation biomécanique retenue au sein de l'équipe Gestes Médico-Chirugicaux Assistés par Ordinateur du laboratoire TIMC. Cette méthodologie s'appuie sur une contrainte de modélisation par Éléments Finis respectant : (1) une définition d'un maillage volumique structuré (éléments briques, topologie permettant l'identification de structures), (2) la mise en place d'une procédure d'automatisation de la conformation des modèles vers les différentes géométries patients, et un cadre permettant des simulation qui s'appuient sur des packages Éléments Finis standards et validés. Ce cadre de modélisation est illustré à travers deux thématiques cliniques que sont l'orthopédie et la chirurgie maxillo-faciale. Mots Clefs: Chirurgie assistée par ordinateur, modélisation biomécanique, recalage élastique, Méthode par Éléments Finis.

Research paper thumbnail of Physically Realistic Interactive Simulation for Biological Soft Tissues

Many applications in biomedical engineering and surgical simulators require effective modeling me... more Many applications in biomedical engineering and surgical simulators require effective modeling methods for dynamic interactive simulations. Due to its high computation time, the standard Finite Element Method (FEM) cannot be used in such cases. A FEM-based method is first presented, which rely on the decomposition of the deformation of each element into a rigid motion and a pure deformation, and a fast implicit dynamic integration without assembling a global stiffness matrix. A second physically-based discrete method is also proposed, derived from computer graphics modeling. These methods are finally compared, in terms of accuracy and speed, to theoretical problems, FEM results and experimental data.

Research paper thumbnail of Evaluation Tridimensionnelle Assistée par Navigation de la Précision du Déplacement Osseux dans la Chirurgie Bimaxillaire; A Propos de 7 Cas

Research paper thumbnail of Modélisation et chirurgie assistée par ordinateur

... composantes principales (ACP) et chercher à identifier la forme 3D de l'organe à partir ... more ... composantes principales (ACP) et chercher à identifier la forme 3D de l'organe à partir de ... d'expression de contraintes globales et de corrélation directe entre paramètres du modèles et ... actuelles concernent d'une part la difficulté de la segmentation automatique des projections ...

Research paper thumbnail of Aide à la classification des fractures du cotyle par segmentation des fragments osseux

Revue de Chirurgie Orthopédique et Traumatologique, 2015

Research paper thumbnail of Shaping by stiffening: lip shape variability through muscle activation

Research paper thumbnail of Simulation of Muscle-Based Orofacial Movement Dynamics using a Muscle Activation Dependent Varying Constitutive Law

This paper presents a dynamic biomechanical model of the face. It is implemented with a finite el... more This paper presents a dynamic biomechanical model of the face. It is implemented with a finite element method in the ANSYS software environment. A three layered mesh adapted to the description of the complex face muscles' courses have been defined. Soft tissues are modelled using a hyperelastic law. The variations of muscle tissues' mechanical properties associated with muscle activation are functionally accounted for and their influence on facial mimics and movements are assessed, in particular in the context of speech gestures.

Research paper thumbnail of A 3D Finite Element Muscle Model and its Application in Driving Speech Articulators

Research paper thumbnail of Evaluating soft tissue simulation in maxillofacial surgery using preoperative and postoperative CT scans

Research paper thumbnail of Evaluating soft tissue simulation in maxillofacial surgery using pre and post-operative CT scan

One of the most important issue in soft tissue modeling is to assess the quality of the simulatio... more 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

Research paper thumbnail of Physical Model Language: Towards a Unified Representation for Continuous and Discrete Models

Lecture Notes in Computer Science, 2004

Dieren t approaches exist for modeling human tissues, mostly discrete and con- tinuous physical m... more Dieren t approaches exist for modeling human tissues, mostly discrete and con- tinuous physical models, e.g. respectively Mass-Spring Networks and Finite Element Method. Whatever approach is chosen, the modeling scheme always follows the same pattern from the generation of the 3D geometry to the analysis of the simulation results. However there are no generic tools that allow for designing a

Research paper thumbnail of A 3D Finite Element Model of the Face for Simulation in Plastic and Maxillo-Facial Surgery

Lecture Notes in Computer Science, 2000

Research paper thumbnail of Shaping by stiffening: a modeling study for lips

Motor control, 2011

On the basis of simulations carried out with a finite element biomechanical model of the face, th... more On the basis of simulations carried out with a finite element biomechanical model of the face, the influence of the muscle stress stiffening effect was studied for the protrusion/rounding of the lips produced with the Orbicularis Oris (OO). It is shown that the stress stiffening effect influences lip shape. When stress stiffening is modeled, the variation in the crucial geometrical characteristics of the lips shows a clear saturation effect as the OO activation level increases. Similarly, for a sufficient amount of OO activation, a saturation effect is observed when stiffening increases. In both cases, differences in lip shaping associated with the absence or presence of stiffening have consequences for the spectral characteristics of the speech signal obtained for the French vowel /u/. These results are interpreted in terms of their consequences for the motor control strategies underlying the protrusion/rounding gesture in speech production.

Research paper thumbnail of Models for Planning and Simulation in Computer Assisted Orthognatic Surgery

Lecture Notes in Computer Science, 2002

Two aspects required to establish a planning in orthognatic surgery are addressed in this paper. ... more Two aspects required to establish a planning in orthognatic surgery are addressed in this paper. First, a 3D cephalometric analysis, which is clinically 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.

Research paper thumbnail of Maxillofacial computer aided surgery: a 5 years experience and future

Eprint Arxiv Physics 0610205, Oct 24, 2006

This paper gives a review of the experience provided by our group in terms of computer aided maxi... more This paper gives a review of the experience provided by our group in terms of computer aided maxillo-facial surgery.

Research paper thumbnail of Biomechanics applied to computer-aided diagnosis: examples of orbital and maxillofacial surgeries

Eprint Arxiv Physics 0610180, Oct 22, 2006

This paper introduces the methodology proposed by our group to model the biological soft tissues ... more 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.

Research paper thumbnail of Computer aided planning for orthognatic surgery

Eprint Arxiv Physics 0610213, Oct 24, 2006

A computer aided maxillofacial sequence is presented, applied to orthognatic surgery. It consists... more 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.

Research paper thumbnail of A Continuous Biomechanical Model of the Face: A Study of Muscle Coordination for Speech Lip Gestures

Research paper thumbnail of Biomechanical models to simulate consequences of maxillofacial surgery

This paper presents the biomechanical finite element models that have been developed in the frame... more This paper presents the biomechanical finite element models that have been developed in the framework of the computer-assisted maxillofacial surgery. After a brief overview of the continuous elastic modelling method, two models are introduced and their use for computer-assisted applications discussed. The first model deals with orthognathic surgery and aims at predicting the facial consequences of maxillary and mandibular osteotomies. For this, a generic three-dimensional model of the face is automatically adapted to the morphology of the patient by the mean of elastic registration. Qualitative simulations of the consequences of an osteotomy of the mandible can thus be provided. The second model addresses the Sleep Apnoea Syndrome. Its aim is to develop a complete modelling of the interaction between airflow and upper airways walls during respiration. Dynamical simulations of the interaction during a respiratory cycle are computed and compared with observed phenomena.

Research paper thumbnail of Orbital and Maxillofacial Computer Aided Surgery: Patient-Specific Finite Element Models To Predict Surgical Outcomes

Comput Methods Biomech Biomed, Jun 16, 2006

This paper addresses an important issue raised for the clinical relevance of Computer-Assisted Su... more This paper addresses an important issue raised for the clinical relevance of Computer-Assisted Surgical applications, namely the methodology used to automatically build patient-specific Finite Element (FE) models of anatomical structures. From this perspective, a method is proposed, based on a technique called the Mesh-Matching method, followed by a process that corrects mesh irregularities. The Mesh-Matching algorithm generates patient-specific volume meshes from an existing generic model. The mesh regularization process is based on the Jacobian matrix transform related to the FE reference element and the current element. This method for generating patient-specific FE models is first applied to Computer-Assisted maxillofacial surgery, and more precisely to the FE elastic modelling of patient facial soft tissues. For each patient, the planned bone osteotomies (mandible, maxilla, chin) are used as boundary conditions to deform the FE face model, in order to predict the aesthetic outcome of the surgery. Seven FE patient-specific models were successfully generated by our method. For one patient, the prediction of the FE model is qualitatively compared with the patient's post-operative appearance, measured from a Computer Tomography scan. Then, our methodology is applied to Computer-Assisted orbital surgery. It is, therefore, evaluated for the generation of eleven patient-specific FE poroelastic models of the orbital soft tissues. These models are used to predict the consequences of the surgical decompression of the orbit. More precisely, an average law is extrapolated from the simulations carried out for each patient model. This law links the size of the osteotomy (i.e. the surgical gesture) and the backward displacement of the eyeball (the consequence of the surgical gesture).

Research paper thumbnail of Méthodologie de modélisation biomécanique des tissus du vivant pour la planification de gestes chirurgicaux

Ce papier vise à introduire la méthodologie de modélisation biomécanique retenue au sein de l'équ... more Ce papier vise à introduire la méthodologie de modélisation biomécanique retenue au sein de l'équipe Gestes Médico-Chirugicaux Assistés par Ordinateur du laboratoire TIMC. Cette méthodologie s'appuie sur une contrainte de modélisation par Éléments Finis respectant : (1) une définition d'un maillage volumique structuré (éléments briques, topologie permettant l'identification de structures), (2) la mise en place d'une procédure d'automatisation de la conformation des modèles vers les différentes géométries patients, et un cadre permettant des simulation qui s'appuient sur des packages Éléments Finis standards et validés. Ce cadre de modélisation est illustré à travers deux thématiques cliniques que sont l'orthopédie et la chirurgie maxillo-faciale. Mots Clefs: Chirurgie assistée par ordinateur, modélisation biomécanique, recalage élastique, Méthode par Éléments Finis.

Research paper thumbnail of Physically Realistic Interactive Simulation for Biological Soft Tissues

Many applications in biomedical engineering and surgical simulators require effective modeling me... more Many applications in biomedical engineering and surgical simulators require effective modeling methods for dynamic interactive simulations. Due to its high computation time, the standard Finite Element Method (FEM) cannot be used in such cases. A FEM-based method is first presented, which rely on the decomposition of the deformation of each element into a rigid motion and a pure deformation, and a fast implicit dynamic integration without assembling a global stiffness matrix. A second physically-based discrete method is also proposed, derived from computer graphics modeling. These methods are finally compared, in terms of accuracy and speed, to theoretical problems, FEM results and experimental data.

Research paper thumbnail of Evaluation Tridimensionnelle Assistée par Navigation de la Précision du Déplacement Osseux dans la Chirurgie Bimaxillaire; A Propos de 7 Cas

Research paper thumbnail of Modélisation et chirurgie assistée par ordinateur

... composantes principales (ACP) et chercher à identifier la forme 3D de l'organe à partir ... more ... composantes principales (ACP) et chercher à identifier la forme 3D de l'organe à partir de ... d'expression de contraintes globales et de corrélation directe entre paramètres du modèles et ... actuelles concernent d'une part la difficulté de la segmentation automatique des projections ...

Research paper thumbnail of Aide à la classification des fractures du cotyle par segmentation des fragments osseux

Revue de Chirurgie Orthopédique et Traumatologique, 2015

Research paper thumbnail of Shaping by stiffening: lip shape variability through muscle activation

Research paper thumbnail of Simulation of Muscle-Based Orofacial Movement Dynamics using a Muscle Activation Dependent Varying Constitutive Law

This paper presents a dynamic biomechanical model of the face. It is implemented with a finite el... more This paper presents a dynamic biomechanical model of the face. It is implemented with a finite element method in the ANSYS software environment. A three layered mesh adapted to the description of the complex face muscles' courses have been defined. Soft tissues are modelled using a hyperelastic law. The variations of muscle tissues' mechanical properties associated with muscle activation are functionally accounted for and their influence on facial mimics and movements are assessed, in particular in the context of speech gestures.

Research paper thumbnail of A 3D Finite Element Muscle Model and its Application in Driving Speech Articulators

Research paper thumbnail of Evaluating soft tissue simulation in maxillofacial surgery using preoperative and postoperative CT scans

Research paper thumbnail of Evaluating soft tissue simulation in maxillofacial surgery using pre and post-operative CT scan

One of the most important issue in soft tissue modeling is to assess the quality of the simulatio... more 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

Research paper thumbnail of Physical Model Language: Towards a Unified Representation for Continuous and Discrete Models

Lecture Notes in Computer Science, 2004

Dieren t approaches exist for modeling human tissues, mostly discrete and con- tinuous physical m... more Dieren t approaches exist for modeling human tissues, mostly discrete and con- tinuous physical models, e.g. respectively Mass-Spring Networks and Finite Element Method. Whatever approach is chosen, the modeling scheme always follows the same pattern from the generation of the 3D geometry to the analysis of the simulation results. However there are no generic tools that allow for designing a

Research paper thumbnail of A 3D Finite Element Model of the Face for Simulation in Plastic and Maxillo-Facial Surgery

Lecture Notes in Computer Science, 2000

Research paper thumbnail of Shaping by stiffening: a modeling study for lips

Motor control, 2011

On the basis of simulations carried out with a finite element biomechanical model of the face, th... more On the basis of simulations carried out with a finite element biomechanical model of the face, the influence of the muscle stress stiffening effect was studied for the protrusion/rounding of the lips produced with the Orbicularis Oris (OO). It is shown that the stress stiffening effect influences lip shape. When stress stiffening is modeled, the variation in the crucial geometrical characteristics of the lips shows a clear saturation effect as the OO activation level increases. Similarly, for a sufficient amount of OO activation, a saturation effect is observed when stiffening increases. In both cases, differences in lip shaping associated with the absence or presence of stiffening have consequences for the spectral characteristics of the speech signal obtained for the French vowel /u/. These results are interpreted in terms of their consequences for the motor control strategies underlying the protrusion/rounding gesture in speech production.

Research paper thumbnail of Models for Planning and Simulation in Computer Assisted Orthognatic Surgery

Lecture Notes in Computer Science, 2002

Two aspects required to establish a planning in orthognatic surgery are addressed in this paper. ... more Two aspects required to establish a planning in orthognatic surgery are addressed in this paper. First, a 3D cephalometric analysis, which is clinically 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.