Search results for "Bioengineering"
showing 10 items of 1963 documents
'Shellome': Proteins involved in mollusk shell biomineralization - diversity, functions.
2011
18 pages; International audience
Toward the development of a remote photoplethysmographic sensor
2019
Heart-rate estimation performed with remote photoplethysmography is a very active research field. Since pioneer works in 2010, which demonstrated the feasibility of the measure with low-grade consumers’ camera (webcam), the number of scientific publications have increased significantly in the domain. Hence, we observe a multiplication of the methods in order to retrieve the photoplethysmographic signal which hasled to an increased precision and quality of the heartrate estimation. Region of interest segmentation is a key step of the processing pipeline in order to maximize the quality of the measured signal. We propose a new method to perform remote photoplethysmographic measurement using a…
Application of the optically stimulated luminescence (OSL) technique for mouse dosimetry in micro-CT imaging
2013
International audience; Purpose: Micro-CT is considered to be a powerful tool to investigate various models of disease on anesthetized animals. In longitudinal studies, the radiation dose delivered by the micro-CT to the same animal is a major concern as it could potentially induce spurious effects in experimental results. Optically stimulated luminescence dosimeters (OSLDs) are a relatively new kind of detector used in radiation dosimetry for medical applications. The aim of this work was to assess the dose delivered by the CT component of a micro-SPECT (single-photon emission computed tomography)/CT camera during a typical whole-body mouse study, using commercially available OSLDs based o…
Integrated PET/MRI in preclinical studies State of the art
2013
International audience; The exquisite tissue contrast of magnetic resonance imaging (MRI), the absence of ionising radiation and the opportunity to obtain new molecular and functional data have strengthened the enthusiasm for coupling MRI rather than computed tomography (CT) to positron emission tomography (PET). When reviewing the current literature one might be surprised by the almost unlimited diversity of what is placed under the name of PET/MRI in the articles. The magnetic field is varying from 0.3 Tesla (T) to 9.4 T, the size of the bore varies also from the wide bore of clinical scanners to volumes limited to a few tens of mL. Many preclinical studies are performed using separate PE…
IRM cardio-vasculaire, des séquences d'acquisition aux paramètres physiologiques
2012
Mes travaux de recherche s'articulent principalement autour de l'extraction automatisée de paramètres anatomiques et fonctionnels en L'Imagerie par Résonance Magnétique (IRM) du cœur et de l'aorte (les renvois des références dans ce document correspondent aux numéros de la liste des publications). Plus précisément, ces travaux sur l'IRM portent sur les thématiques suivantes : - Etude de la fonction cardiaque - Etude de la désynchronisation cardiaque - Etude de la perfusion myocardique et de la viabilité - Etude de l'élasticité de l'aorte - Etude du flux sanguin et détermination de zones de stress au niveau de la paroi de l'aorte - Métrologie des sinus de Valsalva Ces différents points vont …
Interactions entre émotions, cognitions et mouvement volontaire chez le jeune adulte et la personne âgée
2011
International audience; à venir
Focalisation attentionnelle: processus d'apprentissage implicite ?
2011
International audience; à venir
Theranostic gadolinium-based nanoparticles AGuIX®: in vivo imaging and safety evaluation
2015
International audience; IntroductionA new efficient type of gadolinium (Gd)-based theranostic agent (AGuIX®) has recently been developed for MRI-guided radiotherapy.1 These nanoparticles consist of a polysiloxane network surrounded by Gd chelates. Nanoparticles, which contain high-Z contrast agents such as Gd-based nanoparticles, increase the sensitivity of the tumor to radiation. Owing to their small size (3 +/- 0.1 nm), AGuIX® typically exhibit biodistributions that are almost ideal for diagnostic and therapeutic purposes.2 Multi-imaging properties and safety evaluation of the Gd-based nanoparticles have been investigated before their clinical transfer. MethodsGd-based nanoparticles have …
Validation of SiPM-based PET imaging for left ventricular volumes measurements in preclinical imaging: comparison with simultaneously-acquired cardia…
2018
International audience
BEEEP: B1-robust Energy Efficient Excitation Pulses
2019
International audience; SynopsisThis study introduces a new family of broadband B1-robust excitation (90°) pulses for MRI with large enough bandwidth (+/- 1 kHz) to account forstatic field inhomogeneities, and minimal energy deposition. RF pulses are designed with a regularized optimal control algorithm, which is able toadapt the pulse B1-robustness range to fit the coil limits in terms of peak amplitude and energy. In vitro acquisitions using an endoluminal-shapedRF transmit coil show comparable excitation profiles than BIR4 pulses, although BEEEP pulses deposit 5.2 times less energy.https://index.mirasmart.com/ISMRM2019/PDFfiles/4623.html