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Germaneau A, Vendeuvre T, Delmotte A, D'Houtaud S, Brèque C, Petureau L, Doumalin P, Dupré JC, Brémand F, Maxy P, Richer JP, Rigoard P. Should we recommend occipital plate fixation using bicortical screws or inverted occipital hooks to optimize occipito-cervical junction fusion? A biomechanical study combining an experimental and analytical approach. Clin Biomech (Bristol, Avon) 2020; 80:105173. [PMID: 33010700 DOI: 10.1016/j.clinbiomech.2020.105173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 08/31/2020] [Accepted: 09/03/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND Occipito-cervical fusion can be necessary in case of cranio-cervical junction instability. Proximal stabilisation is usually ensured by bi-cortical occipital screws implanted through one median or two lateral occipital plate(s). Bone thickness variability as well as the proximity of vasculo-nervous elements can induce substantial morbidity. The choice of site and implant type remains difficult for surgeons and is often empirically based. Given this challenge, implants with smaller pitch to increase bone interfacing are being developed, as is a surgical technique consisting in inverted occipital hook clamps, a potential alternative to plate/screws association. We present here a biomechanical comparison of the different occipito-cervical fusion devices. METHODS We have developed a 3D mark tracking technique to measure experimental mechanical data on implants and occipital bone. Biomechanical tests were performed to study the mechanical stiffness of the occipito-cervical instrumentation on human skulls. Four occipital implant systems were analysed: lateral plates+large pitch screws, lateral plates+hooks, lateral plates+small pitch screws and median plate+small pitch screws. Mechanical responses were analysed using 3D displacement field measurements from optical methods and compared with an analytical model. FINDINGS Paradoxical mechanical responses were observed among the four types of fixations. Lateral plates+small pitch screws appear to show the best accordance of displacement field between bone/implant/system interface providing higher stiffness and an average maximum moment around 50 N.m before fracture. INTERPRETATION Stability of occipito-cervical fixation depends not only on the site of screws implantation and occipital bone thickness but is also directly influenced by the type of occipital implant.
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Affiliation(s)
- Arnaud Germaneau
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France; Spine & Neuromodulation Functional Unit, Department of Neurosurgery, CHU Poitiers, PRISMATICS Lab, Poitiers, France.
| | - Tanguy Vendeuvre
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France; Spine & Neuromodulation Functional Unit, Department of Neurosurgery, CHU Poitiers, PRISMATICS Lab, Poitiers, France
| | - Alexandre Delmotte
- Spine & Neuromodulation Functional Unit, Department of Neurosurgery, CHU Poitiers, PRISMATICS Lab, Poitiers, France; Centre du Rachis de la Sauvergarde, 69009 Lyon, France
| | - Samuel D'Houtaud
- Spine & Neuromodulation Functional Unit, Department of Neurosurgery, CHU Poitiers, PRISMATICS Lab, Poitiers, France; Service de Neurochirurgie Clinique, La Rochelle, France
| | - Cyril Brèque
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France; ABS Lab, Université de Poitiers, France
| | - Louis Petureau
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France
| | - Pascal Doumalin
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France
| | | | - Fabrice Brémand
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France
| | - Philippe Maxy
- Medtronic, Medtronic International Trading Sarl, Tolochenaz, Switzerland
| | | | - Philippe Rigoard
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France; Spine & Neuromodulation Functional Unit, Department of Neurosurgery, CHU Poitiers, PRISMATICS Lab, Poitiers, France
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Kaseb M, Mercère G, Biermé H, Brémand F, Carré P. Phase estimation of a 2D fringe pattern using a monogenic-based multiscale analysis. J Opt Soc Am A Opt Image Sci Vis 2019; 36:C143-C153. [PMID: 31873714 DOI: 10.1364/josaa.36.00c143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 10/11/2019] [Indexed: 06/10/2023]
Abstract
In this paper, a multiscale monogenic analysis is applied to 2D interference fringe patterns. The monogenic signal was originally developed as a 2D generalization of the well-known analytic signal in the 1D case. The analytic and monogenic tools are both useful to extract phase information, which can then be directly linked with physical quantities. Previous studies have already shown the interest in the monogenic signal in the field of interferometry. This paper presents theoretical and numerical illustrations of the connection between the physical phase information and the phase estimated with the monogenic tool. More specifically, the ideal case of pure cosine waves is deeply studied, and then the complexity of the fringe patterns is progressively increased. One important weakness of the monogenic transform is its singularity at the null frequency, which makes the phase estimations of low-frequency fringes diverge. Moreover, the monogenic transform is originally designed for narrowband signals, and encounters difficulties when dealing with noised signals. These problems can be bypassed by performing a multiscale analysis based on the monogenic wavelet transform. Moreover, this paper proposes a simple strategy to combine the information extracted at different scales in order to get a better estimation of the phase. The numerical tests (synthetic and real signals) show how this approach provides a finer extraction of the geometrical structure of the fringe patterns.
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Vendeuvre T, Dupré JC, Courat N, Léglise A, Hesser F, Brémand F, Brèque C, Germaneau A, Rigoard P. Assessment of PMMA mechanical properties versus time polymerization to optimize fracture stabilizations. Comput Methods Biomech Biomed Engin 2019. [DOI: 10.1080/10255842.2020.1714994] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- T. Vendeuvre
- Spine & Neuromodulation Function Unit, PRISMATICS Lab CHU, Poitiers, France
- Institut Pprime, UPR 3346 CNRS – Université de Poitiers – ISAE-ENSMA, Poitiers, France
| | - J.-C Dupré
- Institut Pprime, UPR 3346 CNRS – Université de Poitiers – ISAE-ENSMA, Poitiers, France
| | - N. Courat
- Spine & Neuromodulation Function Unit, PRISMATICS Lab CHU, Poitiers, France
| | - A. Léglise
- Department of Orthopaedic and Spine Surgery and Traumatology, University Hospital, Bordeaux, France
| | - F. Hesser
- Institut Pprime, UPR 3346 CNRS – Université de Poitiers – ISAE-ENSMA, Poitiers, France
| | - F. Brémand
- Institut Pprime, UPR 3346 CNRS – Université de Poitiers – ISAE-ENSMA, Poitiers, France
| | - C. Brèque
- Institut Pprime, UPR 3346 CNRS – Université de Poitiers – ISAE-ENSMA, Poitiers, France
- ABS Lab, University of Poitiers, Poitiers, France
| | - A. Germaneau
- Institut Pprime, UPR 3346 CNRS – Université de Poitiers – ISAE-ENSMA, Poitiers, France
| | - P. Rigoard
- Spine & Neuromodulation Function Unit, PRISMATICS Lab CHU, Poitiers, France
- Institut Pprime, UPR 3346 CNRS – Université de Poitiers – ISAE-ENSMA, Poitiers, France
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Belaid D, Vendeuvre T, Bouchoucha A, Brémand F, Brèque C, Rigoard P, Germaneau A. Utility of cement injection to stabilize split-depression tibial plateau fracture by minimally invasive methods: A finite element analysis. Clin Biomech (Bristol, Avon) 2018; 56:27-35. [PMID: 29777960 DOI: 10.1016/j.clinbiomech.2018.05.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 04/16/2018] [Accepted: 05/04/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND Treatment for fractures of the tibial plateau is in most cases carried out by stable fixation in order to allow early mobilization. Minimally invasive technologies such as tibioplasty or stabilization by locking plate, bone augmentation and cement filling (CF) have recently been used to treat this type of fracture. The aim of this paper was to determine the mechanical behavior of the tibial plateau by numerically modeling and by quantifying the mechanical effects on the tibia mechanical properties from injury healing. METHODS A personalized Finite Element (FE) model of the tibial plateau from a clinical case has been developed to analyze stress distribution in the tibial plateau stabilized by balloon osteoplasty and to determine the influence of the cement injected. Stress analysis was performed for different stages after surgery. FINDINGS Just after surgery, the maximum von Mises stresses obtained for the fractured tibia treated with and without CF were 134.9 MPa and 289.9 MPa respectively on the plate. Stress distribution showed an increase of values in the trabecular bone in the treated model with locking plate and CF and stress reduction in the cortical bone in the model treated with locking plate only. INTERPRETATION The computed results of stresses or displacements of the fractured models show that the cement filling of the tibial depression fracture may increase implant stability, and decrease the loss of depression reduction, while the presence of the cement in the healed model renders the load distribution uniform.
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Affiliation(s)
- D Belaid
- Department of Mechanical Engineering, Faculty of Technology Sciences, University of Mentouri Brothers - Constantine, P.O. Box 325, Ain-El-Bey Way, Constantine 25017, Algeria; Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Poitiers, France
| | - T Vendeuvre
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Poitiers, France; Department of Orthopaedic Surgery and Traumatology, CHU Poitiers, Poitiers, France; Spine & neuromodulation functional unit, Department of neurosurgery, CHU Poitiers, PRISMATICS Lab, Poitiers, France
| | - A Bouchoucha
- Department of Mechanical Engineering, Faculty of Technology Sciences, University of Mentouri Brothers - Constantine, P.O. Box 325, Ain-El-Bey Way, Constantine 25017, Algeria
| | - F Brémand
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Poitiers, France
| | - C Brèque
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Poitiers, France; ABS Lab, Université de Poitiers, France
| | - P Rigoard
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Poitiers, France; Spine & neuromodulation functional unit, Department of neurosurgery, CHU Poitiers, PRISMATICS Lab, Poitiers, France
| | - A Germaneau
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Poitiers, France.
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Belaid D, Germaneau A, Bouchoucha A, Brémand F, Brèque C, Rigoard P, Vendeuvre T. Finite element analysis of mechanical behavior of stabilization techniques for tibial plateau fractures. Comput Methods Biomech Biomed Engin 2017; 20:13-14. [PMID: 29088628 DOI: 10.1080/10255842.2017.1382837] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- D Belaid
- a Department of Mechanical Engineering, Faculty of Technology Sciences , University of Mentouri Brothers- Constantine , Constantine , Algeria
| | - A Germaneau
- b Institut Pprime UPR 3346 , CNRS - Université de Poitiers - ISAE-ENSMA , France
| | - A Bouchoucha
- a Department of Mechanical Engineering, Faculty of Technology Sciences , University of Mentouri Brothers- Constantine , Constantine , Algeria
| | - F Brémand
- b Institut Pprime UPR 3346 , CNRS - Université de Poitiers - ISAE-ENSMA , France
| | - C Brèque
- b Institut Pprime UPR 3346 , CNRS - Université de Poitiers - ISAE-ENSMA , France.,c ABS Lab , Université de Poitiers , France
| | - P Rigoard
- b Institut Pprime UPR 3346 , CNRS - Université de Poitiers - ISAE-ENSMA , France.,d Department of Neurosurgery, Prismatics Lab , CHU , Poitiers , France
| | - T Vendeuvre
- b Institut Pprime UPR 3346 , CNRS - Université de Poitiers - ISAE-ENSMA , France.,d Department of Neurosurgery, Prismatics Lab , CHU , Poitiers , France.,e Department of Orthopaedic Surgery and Traumatology , CHU , Poitiers , France
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Germaneau A, Vendeuvre T, Saget M, Doumalin P, Dupré JC, Brémand F, Hesser F, Brèque C, Maxy P, Roulaud M, Monlezun O, Rigoard P. Development of an experimental model of burst fracture with damage characterization of the vertebral bodies under dynamic conditions. Clin Biomech (Bristol, Avon) 2017; 49:139-144. [PMID: 28938147 DOI: 10.1016/j.clinbiomech.2017.09.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 09/05/2017] [Accepted: 09/11/2017] [Indexed: 02/07/2023]
Abstract
BACKGROUND Burst fractures represent a significant proportion of fractures of the thoracolumbar junction. The recent advent of minimally invasive techniques has revolutionized the surgical treatment of this type of fracture. However mechanical behaviour and primary stability offered by these solutions have to be proved from experimental validation tests on cadaveric specimens. Therefore, the aim of this study was to develop an original and reproducible model of burst fracture under dynamic impact. METHODS Experimental tests were performed on 24 cadaveric spine segments (T11-L3). A system of dynamic loading was developed using a modified Charpy pendulum. The mechanical response of the segments (strain measurement on vertebrae and discs) was obtained during the impact by using an optical method with a high-speed camera. The production of burst fracture was validated by an analysis of the segments by X-ray tomography. FINDINGS Burst fracture was systematically produced on L1 for each specimen. Strain analysis during impact highlighted the large deformation of L1 due to the fracture and small strains in adjacent vertebrae. The mean reduction of the vertebral body of L1 assessed for all the specimens was around 15%. No damage was observed in adjacent discs or vertebrae. INTERPRETATION With this new, reliable and replicable procedure for production and biomechanical analysis of burst fractures, comparison of different types of stabilization systems can be envisaged. The loading system was designed so as to be able to produce loads leading to other types of fractures and to provide data to validate finite element modelling.
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Affiliation(s)
- A Germaneau
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France.
| | - T Vendeuvre
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France; Department of Orthopaedic Surgery and Traumatology, CHU, Poitiers, France
| | - M Saget
- Department of Orthopaedic Surgery and Traumatology, CHU, Poitiers, France
| | - P Doumalin
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France
| | - J C Dupré
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France
| | - F Brémand
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France
| | - F Hesser
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France
| | - C Brèque
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France; ABS Lab, Université de Poitiers, France
| | - P Maxy
- Medtronic International Trading Sarl, Tolochenaz, Switzerland
| | - M Roulaud
- Department of Neurosurgery, Prismatics Lab, CHU, Poitiers, France
| | - O Monlezun
- Department of Neurosurgery, Prismatics Lab, CHU, Poitiers, France
| | - P Rigoard
- Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, France; Department of Neurosurgery, Prismatics Lab, CHU, Poitiers, France
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Couvertier M, Germaneau A, Saget M, Dupré JC, Doumalin P, Brémand F, Hesser F, Brèque C, Roulaud M, Monlezun O, Vendeuvre T, Rigoard P. Biomechanical analysis of the thoracolumbar spine under physiological loadings: Experimental motion data corridors for validation of finite element models. Proc Inst Mech Eng H 2017; 231:975-981. [PMID: 28707505 DOI: 10.1177/0954411917719740] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Biomechanical studies that involve normal, injured or stabilized human spines are sometimes difficult to perform on large samples due to limited access to cadaveric human spines and biological variability. Finite element models alleviate these limitations due to the possibility of reusing the same model, whereas cadaveric spines can be damaged during testing, or have their mechanicals behaviour modified by fatigue, permanent deformation or structural failure. Finite element models need to be validated with experimental data to make sure that they represent the complex mechanical and physiological behaviour of normal, injured and stabilized spinal segments. The purpose of this study is to characterize the mechanical response of thoracolumbar spine segments with an analytical approach drawn from experimental measurements. A total of 24 normal and fresh cadaveric thoracolumbar spine segments (T11-L3), aged between 53 and 91 years, were tested in pure flexion/extension, lateral bending and axial torsion using a specific experimental setup. Measurements of global and intervertebral angle variations were performed using three-dimensional mark tracking methods. Load/angle curves for each loading were fitted by a logarithmic approach with two coefficients. The coefficients for the functions describing the response of the spinal segments are given and constitute predictive models from experimental data. This work provides data corridors of human thoracolumbar spine motion segments subjected to pure bending in the three physiological planes. These data could be very useful to validate finite element models of the human spine.
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Affiliation(s)
- Marien Couvertier
- 1 Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Futuroscope-Chasseneuil, France
| | - Arnaud Germaneau
- 1 Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Futuroscope-Chasseneuil, France
| | - Mathieu Saget
- 2 Department of Orthopaedic Surgery and Traumatology, CHU, Poitiers, France
| | - Jean-Christophe Dupré
- 1 Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Futuroscope-Chasseneuil, France
| | - Pascal Doumalin
- 1 Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Futuroscope-Chasseneuil, France
| | - Fabrice Brémand
- 1 Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Futuroscope-Chasseneuil, France
| | - Franck Hesser
- 1 Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Futuroscope-Chasseneuil, France
| | - Cyril Brèque
- 1 Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Futuroscope-Chasseneuil, France.,3 ABS Lab, Université de Poitiers, Poitiers, France
| | - Manuel Roulaud
- 4 Department of Neurosurgery, Spine & Neuromodulation Functional Unit, Prismatics Lab, CHU, Poitiers, France
| | - Olivier Monlezun
- 4 Department of Neurosurgery, Spine & Neuromodulation Functional Unit, Prismatics Lab, CHU, Poitiers, France
| | - Tanguy Vendeuvre
- 1 Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Futuroscope-Chasseneuil, France.,2 Department of Orthopaedic Surgery and Traumatology, CHU, Poitiers, France
| | - Philippe Rigoard
- 1 Institut Pprime UPR 3346, CNRS - Université de Poitiers - ISAE-ENSMA, Futuroscope-Chasseneuil, France.,4 Department of Neurosurgery, Spine & Neuromodulation Functional Unit, Prismatics Lab, CHU, Poitiers, France
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Germaneau A, Saget M, Vendeuvre T, Doumalin P, Dupré JC, Brémand F, Hesser F, Maxy P, Rigoard P. Biomechanical analysis of spinal instrumentation systems dedicated to stabilise thoracolumbar fractures: comparison between standard open surgical instrumentation and percutaneous techniques. Comput Methods Biomech Biomed Engin 2014; 17 Suppl 1:72-3. [PMID: 25074170 DOI: 10.1080/10255842.2014.931136] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- A Germaneau
- a Institut Prime UPR 3346, CNRS, Université de Poitiers - ENSMA , Poitiers , France
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Germaneau A, D'Houtaud S, Delmotte A, Doumalin P, Dupré JC, Brémand F, Hesser F, Brèque C, Rigoard P. Experimental analysis of biomechanical behaviour of stabilised occipitocervical junctions. Comput Methods Biomech Biomed Engin 2013; 16 Suppl 1:244-5. [PMID: 23923926 DOI: 10.1080/10255842.2013.815901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- A Germaneau
- Institut Pprime UPR 3346, Université de Poitiers, CNRS, ENSMA, Poitiers, France.
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Germaneau A, Doumalin P, Dupré J, Brèque C, Brémand F, D’Houtaud S, Rigoard P. Experimental analysis of mechanical response of stabilized occipitocervical junction by 3D mark tracking technique. EPJ Web of Conferences 2010. [DOI: 10.1051/epjconf/20100621004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Robin E, Valle V, Brémand F. Phase demodulation method from a single fringe pattern based on correlation with a polynomial form. Appl Opt 2005; 44:7261-9. [PMID: 16353793 DOI: 10.1364/ao.44.007261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The method presented extracts the demodulated phase from only one fringe pattern. Locally, this method approaches the fringe pattern morphology with the help of a mathematical model. The degree of similarity between the mathematical model and the real fringe is estimated by minimizing a correlation function. To use an optimization process, we have chosen a polynomial form such as a mathematical model. However, the use of a polynomial form induces an identification procedure with the purpose of retrieving the demodulated phase. This method, polynomial modulated phase correlation, is tested on several examples. Its performance, in terms of speed and precision, is presented on very noised fringe patterns.
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Affiliation(s)
- Eric Robin
- Université de Poitiers, Laboratoire de Mécanique des Solides, UMR 6610, Téléport 2, Boulevard Pierre et Marie Curie, Boîte Postale 30179, 86962 Futuroscope Chasseneuil Cedex, France
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Abstract
Shadow moiré shows contour lines of an object with respect to a master grating plane; they result from the interference between the lines of the master grid and their shadow projected by a point source of light. In best cases the sensitivity of this procedure is a few tenths of a millimeter. The introduction of a phase-shifting procedure gives a better resolution, but the problem in practice is how can we shift the phase of the interferogram into shadow moiré? A complete study is presented showing the influence of different parameters. It is shown that only one possibility is available. Some applications to threedimensional shape reconstructions are presented with an accuracy of 0.01 mm, showing that the potentiality of shadow moiré is greatly improved.
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