Olivier Gérard

Vermon (France)

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Eigil Samset

University of Oslo

Vincent Lemort

University of Liège

Elsa D. Angelini

Imperial College London

Anne‐Catherine Pouleur

Cliniques Universitaires Saint-Luc

Laure Brisoux Devendeville

Université de Picardie Jules Verne

Jean‐Louis Vanoverschelde

UCLouvain

Agnès Pasquet

Cliniques Universitaires Saint-Luc

Georges de Pelsemaeker

Valeo (France)

Jan D’hooge

KU Leuven

Corinne Lucet

Université de Picardie Jules Verne

Cooperative Institutions

Centre National de la Recherche Scientifique

Inserm

Sorbonne Université

Université Paris Cité

University of Oslo

Philips (France)

University of Liège

Université Paris-Saclay

Oslo University Hospital

Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

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Semi-Automatic Landmark Detection in Digital X-Ray Images of the Spine

Studies in health technology and informatics (2002)

Olivier Gérard Pierre Lelong Milena Planells-Rodriguez S. Makram–Ebeid Bert Verdonck

Quantitative diagnosis of 3D scoliotic deformities depends on a number of dedicated measurements. Existing methods rely on the manual determination of a series of anatomical landmarks in X-ray images. We have developed an automatic method to alleviate the burden of this tedious task. Our method looks for a compromise between local image information and global prior constraints and finds the most probable points using dynamic programming optimization. Remaining errors can be quickly corrected by effective user interaction. The first results are promising.

Landmark

10.3233/978-1-60750-932-5-132

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Citations (2)

Integrating Functional and Anatomical Information to Facilitate Cardiac Resynchronization Therapy

Pacing and Clinical Electrophysiology (2007)

François Tournoux Robert Manzke Raymond C. K. Chan Jorge Solı́s Annabel Chen‐Tournoux

Multiple imaging modalities are required in patients receiving cardiac resynchronization therapy. We have developed a strategy to integrate echocardiographic and angiographic information to facilitate left ventricle (LV) lead position. Full three‐dimensional LV‐volumes (3DLVV) and dyssynchrony maps were acquired before and after resynchronization. At the time of device implantation, 3D‐rotational coronary venous angiography was performed. 3D‐models of the veins were then integrated with the pre‐ and post‐3DLVV. In the case displayed, prior to implantation, the lateral wall was delayed compared to the septum. The LV lead was positioned into the vein over the most delayed region, resulting in improved LV synchrony.

Coronary Vein

10.1111/j.1540-8159.2007.00803.x

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Citations (12)

HEAT RECOVERY SYSTEMS FOR PASSENGERS VEHICLES

Yulia Glavatskaya Olivier Gérard Osoko Fredy Shonda Pierre Podevin

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Citations (0)

Ocular pursuit and visual memory of moving shapes

Neuropsychologia (2008)

Olivier Gérard G Labiale

Smooth pursuit

Visual Search

10.1016/j.neuropsychologia.2008.05.018

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Citations (5)

Left-ventricle to coronary venous tree 3D fusion for cardiac resynchronization therapy applications

2022 IEEE 19th International Symposium on Biomedical Imaging (ISBI) (2017)

Aleksandar Babić Hans Henrik Odland Olivier Gérard Eigil Samset

Response to cardiac resynchronization therapy (CRT) may be improved if coronary venous anatomy is fused with information on regional left ventricular (LV) function to guide LV lead placement. We propose a method to register a 3D model of the LV and its corresponding coronary venous tree (reconstructed from biplane X-ray fluoroscopy) for CRT applications. A template coronary venous tree (CVT) centerline, learned from a training set, was utilized to find point-to-point correspondence between the LV surface and the coronary vessels. The method was validated retrospectively on a set of 15 CRT candidates. Two validation experiments were conducted; on a randomly relocated patient specific LV and on a randomly relocated average LV. The absolute distance error between the ground truth and the registered LV was 3.4±1.0 mm for the case of patient specific LV and 4.2±1.0 mm for the case of average LV model. The probability of targeting the correct coronary branch, when using the registered LV compared to the ground truth, was 95.3±2.5 % for the case of patient specific LV and 94.5±3.5 % for the case of average LV model. The results suggest that the method can be used to provide an automatic registration of a 3D LV model to X-ray imaging with potential applications in image fusion to aid image-guided CRT implantation.

Biplane

10.1109/isbi.2017.7950493

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Citations (3)

Multifractality of the current distribution in directed percolation

Journal of Physics A Mathematical and General (1992)

Jean Schmittbuhl Olivier Gérard Stéphane Roux

The authors investigate numerically the distribution of currents in a two-dimensional diode network at the directed percolation threshold. They obtain the multifractal spectrum of this distribution as well as other scaling properties such as the fractal dimension of the backbone, and the scaling of the conductivity. The analysis of the multifractal spectrum provides information about the singly connected bonds in the lattice.

Multifractal system

Directed percolation

Percolation (cognitive psychology)

Lattice (music)

Continuum percolation theory

10.1088/0305-4470/25/8/025

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Citations (5)

Evaluation of the Durability of Hydrophobic Treatments on Concrete Architectural Heritage

Restoration of Buildings and Monuments (2014)

Vincent Lucquiaud Luc Courard Olivier Gérard Frédéric Michel M. Handy

The protection of historical concrete structures is a challenge for the coming years. Hydrophobic treatment may reduce the deterioration process while providing protection against water penetration. Existing commercial products —mainly silane or siloxane in either water or solvent based formulations– were submitted to different ageing processes including UV radiation, dry-wet cycles, thermal shocks, freeze-thaw cycles, carbonation and their effectiveness has been evaluated on the basis of contact angle, vapour and chloride permeability and, capillarity water absorption. The results obtained clearly show that hydrophobic treatments display a good behaviour under the main ageing conditions.

Siloxane

Penetration (warfare)

10.12900/rbm14.20.6-0038

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Citations (5)

Reproducibility and accuracy of left ventricular mass measurement with real-time three-dimensional echocardiography: comparison with magnetic resonance imaging

Anne‐Catherine Pouleur Agnès Pasquet Bernhard Gerber Jean‐Louis Vanoverschelde J.-B. le Polain de Waroux

Cardiac magnetic resonance

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Parametric ultrasound and fluoroscopy image fusion for guidance of left ventricle lead placement in cardiac resynchronization therapy

Journal of Medical Imaging (2015)

Aleksandar Babić Hans Henrik Odland Olivier Gérard Eigil Samset

Recent studies show that the response rate to cardiac resynchronization therapy (CRT) could be improved if the left ventricle (LV) is paced at the site of the latest mechanical activation, but away from the myocardial scar. A prototype system for CRT lead placement guidance that combines LV functional information from ultrasound with live x-ray fluoroscopy was developed. Two mean anatomical models, each containing LV epi-, LV endo- and right ventricle endocardial surfaces, were computed from a database of 33 heart failure patients as a substitute for a patient-specific model. The sphericity index was used to divide the observed population into two groups. The distance between the mean and the patient-specific models was determined using a signed distance field metric (reported in mm). The average error values for LV epicardium were [Formula: see text] and for LV endocardium were [Formula: see text]. The validity of using average LV models for a CRT procedure was tested by simulating coronary vein selection in a group of 15 CRT candidates. The probability of selecting the same coronary branch, when basing the selection on the average model compared to a patient-specific model, was estimated to be [Formula: see text]. This was found to be clinically acceptable.

Endocardium

Coronary Vein

Sphericity

10.1117/1.jmi.2.2.025001

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Citations (3)

Automatic Analysis of the Left Ventricle in the Time Sequences of 3D Echo-Cardiographic Images

Lecture notes in computer science (2001)

Olivier Gérard Maxim Fradkin A. Collet Billon Mathews Jacob Jean-Michel Rouet

Echo (communications protocol)

Cardiac Ultrasound

Fully automatic

3D ultrasound

10.1007/3-540-45468-3_172

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Citations (2)