Redha Abdeddaïm
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View article: Optimal excitation of single mode resonators: demonstration with a 3 T MRI metasolenoid
Optimal excitation of single mode resonators: demonstration with a 3 T MRI metasolenoid Open
Wireless passive resonators have been developed to inductively couple to the birdcage body coil. Such systems have been explored in the form of ceramic resonators with high permittivity but also with metamaterial or metasurface devices tha…
View article: Optimized reconstruction of undersampled Dixon sequences using new memory‐efficient unrolled deep neural networks: <scp>HalfVarNet</scp> and <scp>HalfDIRCN</scp>
Optimized reconstruction of undersampled Dixon sequences using new memory‐efficient unrolled deep neural networks: <span>HalfVarNet</span> and <span>HalfDIRCN</span> Open
Purpose Fat fraction (FF) quantification in individual muscles using quantitative MRI is of major importance for monitoring disease progression and assessing disease severity in neuromuscular diseases. Undersampling of MRI acquisitions is …
View article: Optimal Excitation of Single Mode Resonators: Demonstration with a 3t MRI Metasolenoid
Optimal Excitation of Single Mode Resonators: Demonstration with a 3t MRI Metasolenoid Open
View article: Anomalous Reflection from Hyperbolic Media
Anomalous Reflection from Hyperbolic Media Open
View article: Evaluation of Human Body Communications Pathloss using Capacitive Coupling
Evaluation of Human Body Communications Pathloss using Capacitive Coupling Open
International audience
View article: Microwave analogy of Förster resonance energy transfer and effect of finite antenna length
Microwave analogy of Förster resonance energy transfer and effect of finite antenna length Open
The near-field interaction between quantum emitters, governed by Förster resonance energy transfer (FRET), plays a pivotal role in nanoscale energy transfer mechanisms. However, FRET measurements in the optical regime are challenging as th…
View article: Evaluation par simulation et mesure de l’atténuation subie par le signal dans les communications utilisant le corps humain comme canal de propagation
Evaluation par simulation et mesure de l’atténuation subie par le signal dans les communications utilisant le corps humain comme canal de propagation Open
International audience
View article: The restricted SAR protocol: A method to assess MRI coil prototypes in an unconditionally safe manner
The restricted SAR protocol: A method to assess MRI coil prototypes in an unconditionally safe manner Open
Purpose Testing an RF coil prototype on subjects involves laborious verifications to ensure its safety. In particular, it requires preliminary electromagnetic simulations and their validations on phantoms to accurately predict the specific…
View article: Efficiently building receive arrays with electromagnetic simulations and additive manufacturing: A two‐layer, 32‐channel prototype for 7T brain <scp>MRI</scp>
Efficiently building receive arrays with electromagnetic simulations and additive manufacturing: A two‐layer, 32‐channel prototype for 7T brain <span>MRI</span> Open
Purpose We propose a comprehensive workflow to design and build fully customized dense receive arrays for MRI, providing prediction of SNR and g‐factor. Combined with additive manufacturing, this method allows an efficient implementation f…
View article: Abstracts from the MYO-MRI+ 2023 | Imaging in Neuromuscular Disease Conference
Abstracts from the MYO-MRI+ 2023 | Imaging in Neuromuscular Disease Conference Open
Background: Many patients with Duchenne muscular dystrophy (DMD) have neurobehavioral problems. Corticosteroids, the primary pharmacological treatment for DMD, have been shown to affect brain morphology in other conditions, but data in DMD…
View article: Broadband terahertz near-field excitation and detection of silicon photonic crystal modes
Broadband terahertz near-field excitation and detection of silicon photonic crystal modes Open
Chip-based terahertz (THz) devices are emerging as versatile tools for manipulating mm-wave frequencies in the context of integrated high-speed communication technologies for potential sixth-generation (6G) wireless applications. The chara…
View article: Experimental evidence of Förster energy transfer enhancement in the near field through engineered metamaterial surface waves
Experimental evidence of Förster energy transfer enhancement in the near field through engineered metamaterial surface waves Open
Plasmonics has been demonstrated to provide fine tuning of the emission properties of single quantum sources (brightness, polarization, directivity, spectrum, lifetime…). However, significantly less is known about the role of surface plasm…
View article: Anomalous Reflection From Hyperbolic Media
Anomalous Reflection From Hyperbolic Media Open
Despite the apparent simplicity, the problem of refraction of electromagnetic waves at the planar interface between two media has an incredibly rich spectrum of unusual phenomena. An example is the paradox that occurs when an electromagnet…
View article: Optimized interferometric encoding of presaturated <scp>TurboFLASH B<sub>1</sub></scp> mapping for parallel transmission <scp>MRI</scp> at <scp>7 T</scp>: Preliminary application for quantitative <scp>T<sub>1</sub></scp> mapping in the spinal cord
Optimized interferometric encoding of presaturated <span>TurboFLASH B<sub>1</sub></span> mapping for parallel transmission <span>MRI</span> at <span>7 T</span>: Preliminary application for quantitative <span>T<sub>1</sub></span> mapping in the spinal cord Open
Purpose The acquisition of accurate B 1 maps is critical for parallel transmit techniques (pTx). The presaturated turboFLASH (satTFL) method has been widely used in combination with interferometric encoding to provide robust and fast B 1 m…
View article: Asymmetric use of 8-legged Conventional Birdcage
Asymmetric use of 8-legged Conventional Birdcage Open
In high-frequency magnetic resonance imaging (MRI) system, shaping of the magnetic field inside the body becomes an important challenge. The choice of the Radio-frequency (RF) coils and their design is essential if a quality image is expec…
View article: Uniform Huygens Metasurfaces with Postfabrication Phase Pattern Recording Functionality
Uniform Huygens Metasurfaces with Postfabrication Phase Pattern Recording Functionality Open
International audience
View article: Radially Extended 3D Birdcage Antenna for MRI With Loop-Type Legs and Connection to the Shield
Radially Extended 3D Birdcage Antenna for MRI With Loop-Type Legs and Connection to the Shield Open
A novel radially extended 3D birdcage (BC) coil antenna was designed, simulated, and optimized for a cylindrical dielectric phantom at 4.7 T. The 3D birdcage consists of a classical birdcage with additional protrusions toward the inside an…
View article: An Antenna Based on Three Coupled Dipoles With Minimized E-Field for Ultra-High-Field MRI
An Antenna Based on Three Coupled Dipoles With Minimized E-Field for Ultra-High-Field MRI Open
International audience
View article: Evaluation of new MR invisible silicon carbide based dielectric pads for 7 T MRI
Evaluation of new MR invisible silicon carbide based dielectric pads for 7 T MRI Open
We demonstrate the long-term performance and invisibility of these new pads in order to increase the contrast in the brain temporal lobes in a commercial 7 T MRI head coil.
View article: Hilbert fractal inspired dipoles for passive RF shimming in ultra-high field MRI
Hilbert fractal inspired dipoles for passive RF shimming in ultra-high field MRI Open
International audience
View article: Improving homogeneity in abdominal imaging at 3 T with light, flexible, and compact metasurface
Improving homogeneity in abdominal imaging at 3 T with light, flexible, and compact metasurface Open
Purpose Radiofrequency field inhomogeneity is a significant issue in imaging large fields of view in high‐ and ultrahigh‐field MRI. Passive shimming with coupled coils or dielectric pads is the most common approach at 3 T. We introduce and…
View article: Large scale fabrication of silicon Mie nanoresonators: an alternative to gold?
Large scale fabrication of silicon Mie nanoresonators: an alternative to gold? Open
International audience
View article: Lightweight metasurface pads for passive RF shimming in 3T abdominal imaging
Lightweight metasurface pads for passive RF shimming in 3T abdominal imaging Open
View article: Complete Electromagnetic Dyadic Green Function Characterization in a Complex Environment—Resonant Dipole-Dipole Interaction and Cooperative Effects
Complete Electromagnetic Dyadic Green Function Characterization in a Complex Environment—Resonant Dipole-Dipole Interaction and Cooperative Effects Open
The Green function completely encapsulates a system’s linear response to external sources, and plays a central role in optics, electromagnetism, and acoustics. In electromagnetism, a broad range of phenomena are connected to the Green func…
View article: Poles, physical bounds, and optimal materials predicted with approximated Mie coefficients
Poles, physical bounds, and optimal materials predicted with approximated Mie coefficients Open
Resonant electromagnetic scattering with particles is a fundamental problem in electromagnetism that has been thoroughly investigated through the excitation of localized surface plasmon resonances (LSPR) in metallic particles or Mie resona…
View article: Improving B1 homogeneity in abdominal imaging at 3 T with light and compact metasurface
Improving B1 homogeneity in abdominal imaging at 3 T with light and compact metasurface Open
Radiofrequency field inhomogeneity is a significant issue in imaging large fields of view in high- and ultrahigh-field MRI. Passive shimming with coupled coils or dielectric pads is the most common approach at 3 T. We introduce and test li…
View article: Extending a birdcage coil for magnetic resonance imaging of a human head with an artificial magnetic shield
Extending a birdcage coil for magnetic resonance imaging of a human head with an artificial magnetic shield Open
View article: CMOS-compatible all-dielectric metalens for improving pixel photodetector arrays
CMOS-compatible all-dielectric metalens for improving pixel photodetector arrays Open
Metasurfaces and, in particular, metalenses have attracted large interest and enabled various applications in the near-infrared and THz regions of the spectrum. However, the metalens design in the visible range stays quite challenging due …
View article: Hilbert Fractal Inspired Dipoles for B<sub>1</sub><sup>+</sup>Field Control in Ultra-High Field MRI
Hilbert Fractal Inspired Dipoles for B<sub>1</sub><sup>+</sup>Field Control in Ultra-High Field MRI Open
Due to the wavelengths' reduction in the human tissues at ultra-high field MRI, head coils usually present B 1 + magnetic field inhomogeneities located at the brain's temporal lobes. Different approaches have effectiv…
View article: An artificial dielectric slab for ultra high-field MRI: Proof of concept
An artificial dielectric slab for ultra high-field MRI: Proof of concept Open