A5064312184- Advanced MRI Techniques and Applications
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Nuclear Physics and Applications
- Ultrasound Imaging and Elastography
- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Wireless Power Transfer Systems
- Lanthanide and Transition Metal Complexes
- Medical Imaging Techniques and Applications
- Photoacoustic and Ultrasonic Imaging
- Electrical and Bioimpedance Tomography
- Wireless Body Area Networks
- Characterization and Applications of Magnetic Nanoparticles
- MRI in cancer diagnosis
- Acoustic Wave Resonator Technologies
- Particle accelerators and beam dynamics
- Microwave Engineering and Waveguides
- 3D Printing in Biomedical Research
- Cardiovascular Disease and Adiposity
- Advanced Thermodynamic Systems and Engines
- Advanced Antenna and Metasurface Technologies
- Tissue Engineering and Regenerative Medicine
- Electron Spin Resonance Studies
- Cardiac Imaging and Diagnostics
Inserm
2020-2025
Université Paris-Saclay
2006-2025
Centre National de la Recherche Scientifique
2014-2024
Laboratoire d’Imagerie Biomédicale
2020-2024
CEA Paris-Saclay
2020-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2020-2024
Centre de Résonance Magnétique des Systèmes Biologiques
2020-2021
Université Paris-Sud
2009-2020
Imagerie par Résonance Magnétique Médicale et Multi-Modalités
2012-2020
Centre de Résonance Magnétique Biologique et Médicale
2007-2020
Since antiquity, artists have been using egg yolk as an additive in the preparation of \textit{tempera} paints. Mixture and water is dispersing medium for pigments to start with, but once on canvas, it acts a binder plasticiser, procuring adhesive properties applied paint. A series water/egg mixtures investigated here combination rheology, Fourier Transform Infrared (FTIR) spectroscopy, Nuclear Magnetic Resonance spectroscopy (NMR) small angle X-ray scattering (SAXS). The effects dilution...
Tissue-engineered scaffolds are made of biocompatible polymers with various structures, allowing cell seeding, growth, and differentiation. Noninvasive imaging methods needed to study tissue-engineered constructs before after implantation. Here, we show that high-resolution magnetic resonance (MRI) performed on a clinical 1.5-T device is reliable technique assess three-dimensional structures porous validate cell-seeding procedures. A high-temperature superconducting detection coil was used...
Purpose This article presents a novel inductive decoupling technique for form‐fitting coil arrays of monolithic transmission line resonators, which target biomedical applications requiring high signal‐to‐noise ratio over large field view to image anatomical structures varying in size and shape from patient patient. Methods Individual resonator elements are mutually decoupled using magnetic flux sharing by overlapping annexes. was evaluated electromagnetic simulations bench measurements two‐...
Purpose To investigate whether cellular imaging by using ultrasmall superparamagnetic iron oxide (USPIO)–enhanced magnetic resonance (MR) can allow detection and quantification of adipose tissue macrophage–related inflammation within in a mouse model. Materials Methods Experimental protocols were conducted accordance with French government policies. Adipose macrophages detected quantified 4.7-T MR imager ob/ob obese mice on the basis signal variance triggered injection P904 nanoparticles...
A flexible transceiver array based on transmission line resonators (TLRs) combining the advantages of coil arrays with possibility form-fitting targeting cardiac MRI at 7 T is presented. The design contains 12 elements which are fabricated a substrate rigid PCBs attached center each element to place interface components, i.e. transmit/receive (T/R) switch, power splitter, pre-amplifier and capacitive tuning/matching circuitry. mutual coupling between cancelled using decoupling ring-based...
A novel design scheme for monolithic transmission line resonators (TLRs) is presented - the multi-turn multi-gap TLR (MTMG-TLR) design. The MTMG-TLR enables construction of TLRs with multiple turns and gaps. This presents an additional degree freedom in tuning self-resonant TLRs, as their resonance frequency fully determined by coil geometry (e.g. diameter, number turns, conductor width, etc.). evaluated at 4.7 T 7 simulations experiments, where it demonstrated that MTMG-TLRs can be used...
Radiofrequency (RF) coils fashioned from high-temperature superconductor (HTS) have the potential to increase sensitivity of magnetic resonance imaging (MRI) experiment by more than a dozen times compared conventional copper coils. Progress, however, has been slow due series technological hurdles. In this article, we present developments that recently led new perspectives for HTS coil in MRI, and challenges still need be solved. First, recall motivations implementations MRI presenting limits...
Submicron membrane fragments termed microparticles (MPs), which are released by apoptotic or activated cells, newly considered as vectors of biological information and actors pathology development. We propose the tagging MPs with magnetic nanoparticles a new approach allowing imaging, manipulation targeting cell-derived MPs.MPs generated in vitro from human endothelial cells isolated atherosclerotic plaques were labeled using citrate-coated 8 nm iron-oxide nanoparticles. tagged on their...
In this paper, we detail how microantennae dedicated to Magnetic Resonance Imaging (MRI) can benefit from the advantages offered by polymer substrates, especially flexibility and dielectric properties. We present a monolithic wireless design based on transmission lines between conductor windings both sides of substrate its fabrication process. This last one requires specific plasma treatments improve polymer/metal adhesion. have led comparative study effects ageing time wettability metal...
In this chapter we describe computer-based tomographic methods using magnetic resonance imaging (MRI) and X-ray absorption as well phase-contrast techniques. The latter are based on refraction near-field diffraction of X-rays gaining increased attention due to the increase in sensitivity they offer over conventional, attenuation-based is particular interest marine biology imaging, especially for soft tissue visualization analysis. basic principles techniques described, starting with an...
Magnetic resonance imaging (MRI) is a major modality, giving access to anatomical and functional information with high diagnostic value. To achieve high-quality images, optimization of the radio-frequency coil that detects MR signal utmost importance. A widely applied strategy use arrays small coils in parallel on scanners equipped multiple receive channels local detection sensitivity over an extended lateral coverage while allowing for accelerated acquisition SNR by proper weighting...
Iron oxide magnetic nanoparticles have emerged as promising theranostic agents for cardiovascular diseases. Using a multiscale approach, we investigate the interaction of 27 nm diameter multicore magnetite nanoflowers with blood components. flow cytometry and dynamic light scattering, determine safe concentration levels. Data indicates negligible impact on red cells white all concentrations exposure durations studied, whilst platelets exhibit reversible activation at high concentrations....
In this work an electromagnetic compatibility (EMC) analysis is performed by means of a dedicated finite element simulation magnetic resonance imaging (MRI) environment to determine the impact hosting in scenery different materials and structures necessitated guided interventions. The results obtained could be used for design optimization devices such (actuator, mechatronics…).
The present work investigates the joined effects of temperature and static magnetic field on electrical properties a 64 MHz planar high-temperature superconducting (HTS) coil, in order to enhance signal-to-noise ratio (SNR) nuclear resonance (NMR) applications with moderate decrease HTS coil (THTS). Temperature control is provided accuracy better than 0.1 K from 80 66 by regulating pressure liquid nitrogen bath dedicated cryostat. actual obtained using straightforward wireless method that...
Teaching imaging of magnetic resonance (MR) today is still as challenging it has always been, because requires admitting that we cannot express fundamental questions quantum mechanics with straightforward language or without using extensive theory. Here allow students to face a real MR setup based on the Earth's field. We address applied side teaching device affordable and proves be sufficiently robust, at universities in Orsay, France, San Sebastian, Spain, experimental practicals...
A contactless method based on reflectometry to accurately characterize an inductive radio frequency (rf) resonator even in the occurrence of a strong electrical nonlinearity is presented. Nonlinear extraction unloaded quality factor and resonance possible by combining initial low-level swept-frequency calibration with high-level single-frequency measurements. The protocol relies simple intrinsic R, L, C model does not involve fitting procedure according particular model. It includes...
Small-sized High Temperature Superconducting (HTS) radiofrequency coils are used in a number of micro-magnetic resonance imaging applications and demonstrate high detection sensitivity that improves the signal-to-noise ratio. However, use HTS could be limited by rarity cryostats suitable for MR environment. This study presents magnetic (MR)-compatible easily operated cryogen-free cryostat based on pulse tube cryocooler technology cooling monitoring below temperature liquid nitrogen. features...
High-Temperature Superconducting (HTS) radio frequency coils can greatly improve the sensitivity of Magnetic Resonance Imaging (MRI), with signal to noise ratios increased by up 16 times. However, as homogeneity static field B0 is a major condition for MR acquisitions, their propensity warp magnetic in vicinity result flux expulsion could cause severe image degradation. In this Letter, we report on observation artifacts generated from HTS coil. To that end, acquired images water sample...
We have investigated the effect of different types disorder on propagation, roughness, and scaling properties magnetic flux fronts in a type II superconductor. A progression from usual (Kardar–Parisi–Zhang-type) to multiscaling is observed as strength increased. hierarchy strengths established for YBa 2 Cu 3 O 7 − δ thin films. The results cast light physical origin roughening fronts, they are interest design elimination noise microscopic superconducting thin-film devices.