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327 results on '"De Beule, Matthieu"'

9. Procedure to describe clavicular motion

Author

Gutierrez Delgado, Guivey, De Beule, Matthieu, Ortega Cardentey, Dolgis R., Segers, Patrick, Iznaga Benítez, Arsenio M., Rodríguez Moliner, Tania, Verhegghe, Benedict, Palmans, Tanneke, Van Hoof, Tom, and Van Tongel, Alexander

Published
2017
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32. Automatic Detection of the Aortic Annular Plane and Coronary Ostia from Multidetector Computed Tomography

Author

Astudillo, Patricio, Mortier, Peter, Bosmans, Johan, De Backer, Ole, de Jaegere, Peter, Iannaccone, Francesco, De Beule, Matthieu, Dambre, Joni, Astudillo, Patricio, Mortier, Peter, Bosmans, Johan, De Backer, Ole, de Jaegere, Peter, Iannaccone, Francesco, De Beule, Matthieu, and Dambre, Joni

Abstract

Anatomic landmark detection is crucial during preoperative planning of transcatheter aortic valve implantation (TAVI) to select the proper device size and assess the risk of complications. The detection is currently a time-consuming manual process influenced by the image quality and subject to operator variability. In this work, we propose a novel automatic method to detect the relevant aortic landmarks from MDCT images using deep learning techniques. We trained three convolutional neural networks (CNNs) with 344 multidetector computed tomography (MDCT) acquisitions to detect five anatomical landmarks relevant for TAVI planning: the three basal attachment points of the aortic valve leaflets and the left and right coronary ostia. The detection strategy used these three CNN models to analyse a single MDCT image and yield three segmentation volumes as output. These segmentation volumes were averaged into one final segmentation volume, and the final predicted landmarks were obtained during a postprocessing step. Finally, we constructed the aortic annular plane, defined by the three predicted hinge points, and measured the distances from this plane to the predicted coronary ostia (i.e., coronary height). The methodology was validated on 100 patients. The automatic landmark detection was able to detect all the landmarks and showed high accuracy as the median distance between the ground truth and predictions is lower than the interobserver variations (1.5 mm [1.1-2.1], 2.0 mm [1.3-2.8] with a paired difference -0.5 ± 1.3 mm and p value <0.001). Furthermore, a high correlation is observed between predicted and manually measured coronary heights (for both R2 = 0.8). The image analysis time per patient was below one second. The proposed method is accurate, fast, and reproducible. Embedding this tool based on deep learning in the preoperative planning routine may have an impact in the TAVI environments by reducing the time and cost and improving accuracy.

Published
2020

40. Treatment of Renal Artery Aneurysm With the Multilayer Stent

Author

Henry, Michel, Polydorou, Antonios, Frid, Noureddine, Gruffaz, Patricia, Cavet, Alain, Henry, Isabelle, Hugel, Michèle, Rüfenacht, Daniel A., Augsburger, Luca, De Beule, Matthieu, Verdonck, Pascal, Bonneau, Maurice, Kang, Chantal, Ouared, Rafik, and Chopard, Bastien

Published
2008

42. A study on the efficacy of AFO stiffness prescriptions

Author

Vasiliauskaite, Egle, primary, Ielapi, Alessio, additional, De Beule, Matthieu, additional, Van Paepegem, Wim, additional, Deckers, Jan Patrick, additional, Vermandel, Miguel, additional, Forward, Malcolm, additional, and Plasschaert, Frank, additional

Published
2019
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46. Evaluation of a modified Cheatham-Platinum stent for the treatment of aortic coarctation by finite element modelling

Author

Burkhardt, Barbara E U; https://orcid.org/0000-0002-0412-9958, Byrne, Nicholas; https://orcid.org/0000-0003-3401-9570, Velasco Forte, Marí Nieves, Iannaccone, Francesco, De Beule, Matthieu, Morgan, Gareth J, Hussain, Tarique, Burkhardt, Barbara E U; https://orcid.org/0000-0002-0412-9958, Byrne, Nicholas; https://orcid.org/0000-0003-3401-9570, Velasco Forte, Marí Nieves, Iannaccone, Francesco, De Beule, Matthieu, Morgan, Gareth J, and Hussain, Tarique

Abstract

Objectives: Stent implantation for the treatment of aortic coarctation has become a standard approach for the management of older children and adults. Criteria for optimal stent design and construction remain undefined. This study used computational modelling to compare the performance of two generations of the Cheatham-Platinum stent (NuMED, Hopkinton, NY, USA) deployed in aortic coarctation using finite element analysis. Design: Three-dimensional models of both stents, reverse engineered from microCT scans, were implanted in the aortic model of one representative patient. They were virtually expanded in the vessel with a 16 mm balloon and a pressure of 2 atm. Results: The conventional stent foreshortened to 96.5% of its initial length, whereas the new stent to 99.2% of its initial length. Diameters in 15 slices across the conventional stent were 11.6-15 mm (median 14.2 mm) and slightly higher across the new stent: 10.7-15.3 mm (median 14.5 mm) (p= 0.021). Apposition to the vessel wall was similar: conventional stent 31.1% and new stent 28.6% of total stent area. Conclusions: The new design Cheatham-Platinum stent showed similar deployment results compared to the conventional design. The new stent design showed slightly higher expansion, using the same delivery balloon. Patient-specific computational models can be used for virtual implantation of new aortic stents and promise to inform subsequent in vivo trials.

Published
2018

47. A study on the efficacy of AFO stiffness prescriptions.

Author

Vasiliauskaite, Egle, Ielapi, Alessio, De Beule, Matthieu, Van Paepegem, Wim, Deckers, Jan Patrick, Vermandel, Miguel, Forward, Malcolm, and Plasschaert, Frank

Subjects
ANKLE, DIAGNOSIS, GAIT in humans, RANGE of motion of joints, KINEMATICS, POLYENES, DATA analysis software, FOOT orthoses
Abstract

Ankle foot orthosis (AFO) stiffness is a key characteristic that determines how much support or restraint an AFO can provide. Thus, the goal of the current study is twofold: (1) to quantify AFO prescriptions for a group of patients; (2) to evaluate what impact these AFO have on the push-off phase. Six patients were included in the study. Three patients were prescribed an AFO for ankle support and three patients were prescribed an AFO for ankle and knee support. Two types of AFO – a traditional polypropylene AFO (AFOPP) and a novel carbon-selective laser sintered polyamide AFO (AFOPA), were produced for each patient. AFO ankle stiffness was measured in a dedicated test rig. Gait analysis was performed under shod and orthotic conditions. Patient mass normalized AFOPP stiffness for ankle support ranged from 0.042 to 0.069 N·m·deg−1·kg−1, while for ankle and knee support it ranged from 0.081 to 0.127 N·m·deg−1·kg−1. On the group level, the ankle range of motion and mean ankle velocity in the push-off phase significantly decreased in both orthotic conditions, while peak ankle push-off power decreased non-significantly. Accordingly, on the group level, no significant improvements in walking speed were observed. However, after patient differentiation into good and bad responders it was found that in good responders peak ankle push-off power tended to be preserved and walking speed tended to increase. Quantification of AFO stiffness may help to understand why certain orthotic interventions are successful (unsuccessful) and ultimately lead to better AFO prescriptions. AFO ankle stiffness is key characteristic that determines how much support or restraint an AFO can provide. In a typical clinical setting, AFO ankle stiffness is not quantified. AFO has to meet individual patient's biomechanical needs. More objective AFO prescription and more controlled AFO production methods are needed to increase AFO success rate. [ABSTRACT FROM AUTHOR]

Published
2021
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48. Impact of plaque Ttpe and side branch geometry on side branch compromise after provisional stent implantation a simulation study

Author

Iannaccone, Francesco, Chiastra, Claudio, Karanasos, Antonios, Migliavacca, Francesco, Gijsen, Frank J H, Segers, Patrick, Mortier, Peter, Verhegghe, Benedict, Dubini, Gabriele, De Beule, Matthieu, Regar, Evelyn, Wentzel, Jolanda J, University of Zurich, and Wentzel, Jolanda J

Subjects
Coronary bifurcations, Computer modelling, Provisional side branch stenting, 610 Medicine & health, 2705 Cardiology and Cardiovascular Medicine, 10020 Clinic for Cardiac Surgery
Published
2017

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