References of "Lempereur, Mathieu"
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See detailUnintentional "Ventriculo-Phlebo-Myo-Pericardiography"
Gach, Olivier; Lempereur, Mathieu; Eeckhout, Eric et al

in JACC. Cardiovascular Interventions (2014)

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See detailUsing merged kinematic and anatomical data to evaluate humeral motion estimation: a pilot study
Schwartz, Cédric ULg; Leboeuf, Fabien; Rémy-Néris, Olivier et al

in Computer Methods in Biomechanics and Biomedical Engineering. Imaging & Visualization (2013)

Optoelectronic systems are widely used in 3D motion capture. However, the reliability of the motion estimation depends on soft tissue artifacts and should therefore be validated. Two different sets of ... [more ▼]

Optoelectronic systems are widely used in 3D motion capture. However, the reliability of the motion estimation depends on soft tissue artifacts and should therefore be validated. Two different sets of humeral markers were studied on four subjects. Anatomical and kinematic measurements were combined and the plausibility of the relative position of the bones in the glenohumeral joint during motion was evaluated using a new coherence index. Our findings show that an identical protocol leads to a large variability of the articular coherence for the subjects. However the use of an extra marker on the distal part of the humerus improves the humeral kinematics for three of the four subjects. Scientists and clinicians using 3D systems should remain aware of the influence of subject-specific morphology on the accuracy of the measure. Differences with a reference group may come from clinical reasons but also from measurement errors due to the inter-individual morphological differences. [less ▲]

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See detailRecurrent stress cardiomyopathy with variable pattern of left ventricle contraction abnormality.
Gach, Olivier; Lempereur, Mathieu; Pierard, Luc ULg et al

in Journal of the American College of Cardiology (2012), 60(3), 5

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See detailDetection of incoherent joint state due to inaccurate bone motion estimation
Schwartz, Cédric ULg; Leboeuf, Fabien; Rémy-Néris, Olivier et al

in Computer Methods in Biomechanics & Biomedical Engineering (2011)

In biomechanical modeling and motion analysis, the use of personalized data such as bone geometry would provide more accurate and reliable results. However, there is still a limited number of tools used ... [more ▼]

In biomechanical modeling and motion analysis, the use of personalized data such as bone geometry would provide more accurate and reliable results. However, there is still a limited number of tools used to measure the evolution of articular interactions. This paper proposes a coherence index to describe the articular status of contact surfaces during motion. The index relies on a robust estimation of the evolution of surfacic interactions between the joint surfaces. The index is first compared to distance maps on simulated motions. It is then used to compare two motion capture protocols (two different localizations of the markers for scapula tracking). The results show that the index detects progressive modifications in the joint and allows to distinguish the two protocols, in accordance with the literature. In the future, the index could, among other things, be used to compare / improve biomechanical models and motion analysis protocols. [less ▲]

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See detailMéthode d'analyse du mouvement de l'épaule par utilisation de nappes
Schwartz, Cédric ULg; Lempereur, Mathieu; Burdin, Valérie et al

Poster (2006)

Nous proposons une méthode permettant d’étudier le mouvement des structures osseuses du complexe de l'épaule (humérus, omoplate, clavicule). Cette méthode est basée sur le suivi de nappes de marqueurs ... [more ▼]

Nous proposons une méthode permettant d’étudier le mouvement des structures osseuses du complexe de l'épaule (humérus, omoplate, clavicule). Cette méthode est basée sur le suivi de nappes de marqueurs plutôt qu'un ensemble de marqueurs individuels à l'aide d'un système de caméras VICON. Le suivi du mouvement des nappes par un algorithme de recalage robuste doit permettre de s'affranchir du mouvement de la peau et avoir accès aux mouvements des structures osseuses sous-jacentes. Cette méthode est comparée à une méthode standard de la littérature. Les résultats montrent que le mouvement de l’omoplate est sous estimé ou sur estimé suivant les axes de rotation. [less ▲]

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