Laurent ENGELSFrom Lisa
Contactlaurent.engels_AT_ulb.ac.be ULB - LISA CP165/57 
TeachingAssistant to Pr Nadine WARZEE for the following course:
Research Topics
PublicationsPapersL. Engels, L. Bavay, A. Tsingarida,Calculating vessel capacities : a new web-based solutions Shapes and Uses of Greek Vases (7th– 4th centuries B.C.), pp. 129-133, 2010 Bibtex Bibtex : engels10b L. Engels, X. De Tiege, M. Op de Beeck, N. Warzée, Factors influencing the spatial precision of electromagnetic tracking systems used for MEG/EEG source imaging Neurophysiologie Clinique/Clinical Neurophysiology, Vol. 40, pp. 19-25, 2010 Bibtex Bibtex : engels10a Abstract : Summary Objectives.—The purpose of this study is to determine the factors influencing the spatial precision and the replicability of electromagnetic trackers (EMT) for the localization of electrodes and natural landmarks on the patient’s head. Materials and methods.—The effects of seven conditions on the measurement of the EMT were investigated with a Polhemus Fastrack: distance, contact between two components of the EMT, presence of magnetic object, localization of landmarks and electrodes on a phantom and a human subject without and with movements. Results.—The EMT has a precision of 0.15mm±0.36mm for the measurements made on still objects in a non-magnetic environment. On a human subject, the mean variation of the nasion position is 1.6mm±1.46mm and 2.7mm±1.40mm for the tragus. The increase of the electrode measurement dispersions is significant between the phantom and the human subject with a mean variation of 2.39mm±1.26mm. In certain conditions, up to 15% of the measurements may be considered as outliers. Conclusion.—The precision significantly decreases for this application in the following cases: (1) physical contacts between the stylus/transmitter/receiver cables, (2) presence of magnetic objects in the surrounding of the EMT system, (3) skin and hair softness and (4) subject’s head movementsO. Debeir, P. Dunham, L. Engels, T. Leloup, X. Baele, N. Warzée, High Resolution 3D Acquisition of the Olivier Strebelle's Sculpture "Athletes' Alley in Beijing 2008" International Review on Computers and Software (IRECOS), Vol. 2, 5, pp. 541-545, Sept 2007 Bibtex Bibtex : debeir07b L. Engels, T. Leloup, N. Warzée, Imaging technologies for avoiding back pain at work In proceedings First Symposium of the IEEE/EMBS Benelux Chapter, pp. 235-238, Dec 2006 Bibtex Bibtex : engels06b ConferencesL. Engels, X. De Tiège, M. Op de Beeck, N. Warzée,Acquisistion and identification of EEG electrodes and HPI coils using infrared LED cameras Proceedings of 9th Belgian Day on Biomedical Engineering, pp. 85, 2010 Bibtex Bibtex : engels10c L. Engels, X. De Tiege, M. Op de Beeck, N. Warzée, Accuracy study of electromagnetic tracking system for the spatial localization of electrodes BIOMAG : International Conference on Biomagnetism, Aug 2008 Bibtex Bibtex : engels08a L. Engels, D. Milojevic, N. Warzée, 3D and Virtual Reality : Tools For Archaeological Hypothesis Verification In proceedings 9th Virtual Reality International Conference, pp. 203-208, Laval, France, Apr 2007 Bibtex Bibtex : engels07c L. Engels, T. Leloup, N. Warzée, Automatic preventive control for work posture in front of a visual display terminal 9th Virtual Reality International Congress, Laval, France, Poster, Apr 2007 Bibtex Bibtex : engels07b L. Engels, L. Bavay, A. Tsingarida, Présentation du programme de calcul de capacité, accessible sur le site du Centre de Recherches Archéologiques Formes et usages des vases grecs (VIIe - IVe siècles av. J.-C.), Bruxelles, Apr 2006 Bibtex Bibtex : engels06a L. Engels, P. Dunham, N. Warzée, Interactive web-based application for potteries capacity computing Proceedings of the 11th International Conference “Cultural Heritage and New Technologies", pp. 1-5, 2006 Bibtex Bibtex : engels06c Acquisition en temps réel, identification et mise en correspondance de données 3D: application à la magnétoencéphalographie, thèse de doctorat, 2011 Students projectsExposition 1910 (Stage HEAJ 3) StagesExposition 1910 (Stage HEAJ 3) Misc
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