Publications by authors named "Francois Bermond"
Article Synopsis
- - The study addresses the need for reliable methods to predict the risk of fractures in patients with femoral metastases, highlighting the limitations of current clinical tools and the potential of CT-scan-based finite element analysis for better predictions.
- - Researchers assessed the reproducibility of a promising model developed in Belgium by comparing it to an independently reproduced model in France, confirming a strong correlation but noting the reproduced model consistently predicts higher failure loads.
- - The evaluation of the model's application on different datasets showed decreased accuracy in predictions, while the global sensitivity analysis revealed significant factors affecting results, especially the influence of the density calibration coefficient.
Article Synopsis
- * Manual segmentation is often tedious and can vary between experts, prompting the use of deep learning techniques to automate the process even when data is limited.
- * The study develops a specialized pipeline using U-Net architectures for segmenting human femurs and vertebrae, showing that automated segmentation yields results comparable to manual methods in failure load simulations, highlighting its potential effectiveness.
Introduction: Recent technological advances with dual-energy quantitative computed tomography (DEQCT) allow to combine two images of different level of energy to obtain simulated mono-energetic images at 60 keV (60KeV-QCT) with improved image contrast in clinical practice. This study includes three topics: (1) compare bone mineral content (BMC), areal and volumetric bone mineral density (aBMD, vBMD) obtained with 60KeV-QCT, single-energy QCT (SEQCT), and dual X-ray absorptiometry (DXA); (2) compare ash density and weight with respective vBMD and BMC assessed on 60KeV-QCT, SEQCT, and DXA; and (3) compare the influence of reconstruction kernels on the accuracy of vBMD and BMC using ash density and ash weight as the reference values.
Methods: DXA, SEQCT, and DEQCT acquisitions were performed ex vivo on 42 human femurs.
Thoracic injuries are a major cause of mortality in frontal collisions, especially for elderly female and obese people. Car occupant individual characteristics like age, gender and Body Mass Index (BMI) are known to influence human vulnerability tolerance in crashes. The objective of the this study was to perform in vivo test experiments to quantify the influence of subject characteristics in terms of age, gender and anthropometry and on thorax mechanical response variability under belt loading.
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- The study investigates how the human trunk responds to force during respiratory physiotherapy in both children and adults, highlighting differences in shape due to methodology and participant demographics.
- It involved eight children aged 5-15 months and eight healthy adults, measuring the applied force by a physiotherapist and the resulting trunk displacement, revealing time lags that affect force-displacement curves.
- The findings show maximum trunk displacements of 18 mm (children) and 44 mm (adults) with corresponding loads of 208 N and 250 N, emphasizing the need for further data on muscle activity and breathing for better trunk modeling.
Thoracic injuries are a major cause of mortality in frontal collisions, especially for elderly and obese people. Car occupant individual characteristics like BMI are known to influence human vulnerability in crashes. In the present study, thoracic mechanical response of volunteers quantified by optical method was linked to individual characteristics.
View Article and Find Full Text PDFBackground: The purpose of this study is to quantify the in vivo mechanical response of the child trunk under loading during physiotherapy treatments.
Methods: Twenty-six children aged 45 days to 7 years (14 girls and 12 boys) took part in this study. The forces applied by the physiotherapist were recorded using a force-plate embedded in the manipulation table supporting the child.
Two series of nine frontal sled tests were conducted to evaluate the behavior of the Hybrid III and Thor-alpha dummies. The first series was conducted at 50 kph with airbag and 4 kN force-limited shoulder belt and the second series at 30 kph and only a 4 kN force-limited shoulder belt. In each series, three replicate tests were conducted with each dummy and compared with three PMHS.
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