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View article: On the Impact of Artifacts Induced by Mismatches Between Auto‐Calibration Signal and Accelerated 3D GRE Data at 11.7T
On the Impact of Artifacts Induced by Mismatches Between Auto‐Calibration Signal and Accelerated 3D GRE Data at 11.7T Open
Purpose The study aims at investigating field inhomogeneity artifacts arising from remote locations in the FOV and encountered in accelerated 3D gradient‐recalled echo (GRE) sequences at ultra‐high field, and at providing mitigation strate…
View article: Cerebrovascular autoregulation in hypoxia: quantitative insights from arterial spin labeling
Cerebrovascular autoregulation in hypoxia: quantitative insights from arterial spin labeling Open
Hypoxia, defined as an insufficient oxygen supply relative to metabolic demand, induces a cascade of cerebrovascular and metabolic responses aimed at preserving cerebral homeostasis. These responses vary depending on the temporal profile o…
View article: Does Freediving Lead to Hippocampal Adaptability to Hypoxia and Maintenance of Episodic Memory?
Does Freediving Lead to Hippocampal Adaptability to Hypoxia and Maintenance of Episodic Memory? Open
Background: Accidental hypoxia has detrimental effects on the brain, particularly on the hippocampal subfields (HS), which are highly sensitive to oxygen deprivation and play a crucial role in episodic memory. This raises the question: cou…
View article: pTx‐Pulseq in hybrid sequences: Accessible and advanced hybrid open‐source <scp>MRI</scp> sequences on Philips scanners
pTx‐Pulseq in hybrid sequences: Accessible and advanced hybrid open‐source <span>MRI</span> sequences on Philips scanners Open
Purpose To enhance the accessibility of advanced pulse sequences, or parts thereof, through the open‐source Pulseq framework. This work extends the Pulseq framework to Philips MRI systems and incorporates dynamic parallel‐transmit (pTx) ca…
View article: Hypoxia’s Impact on Hippocampal Functional Connectivity: Insights from Resting-State fMRI Studies
Hypoxia’s Impact on Hippocampal Functional Connectivity: Insights from Resting-State fMRI Studies Open
The hippocampus is one of the brain’s most vulnerable structures to hypoxia, playing a crucial role in memory and spatial navigation. This sensitivity makes it a key region for understanding the effects of hypoxia on brain connectivity. Th…
View article: Feasibility of Implementing Motion-Compensated Magnetic Resonance Imaging Reconstruction on Graphics Processing Units Using Compute Unified Device Architecture
Feasibility of Implementing Motion-Compensated Magnetic Resonance Imaging Reconstruction on Graphics Processing Units Using Compute Unified Device Architecture Open
Motion correction in magnetic resonance imaging (MRI) has become increasingly complex due to the high computational demands of iterative reconstruction algorithms and the heterogeneity of emerging computing platforms. However, the clinical…
View article: Parallel transmit 7 <scp>T MRI</scp> for adult epilepsy pre‐surgical evaluation
Parallel transmit 7 <span>T MRI</span> for adult epilepsy pre‐surgical evaluation Open
Objective To implement parallel transmit (pTx) 7T magnetic resonance imaging (MRI) in the pre‐surgical evaluation of 3T‐negative patients with drug‐resistant focal epilepsy, and to compare quality to conventional single transmit (specifica…
View article: Unifying Seismic Noise Tomography and MRI for Brain Tumors Diagnosis
Unifying Seismic Noise Tomography and MRI for Brain Tumors Diagnosis Open
View article: Comparison at 7T of the Impulse head gradient and whole-body SC72 gradient transfer functions.
Comparison at 7T of the Impulse head gradient and whole-body SC72 gradient transfer functions. Open
Motivation: Ultra-high field MRI requires high performance and accurate gradients to push forward the spatio-temporal resolution, especially for fMRI scans. Goal(s): Compare two commercial gradient coils (whole-body SC72 and head-only Impu…
View article: An 8-Channel Transmit Array in Combination with a 31-Channel Receive Array for Human Brain Imaging at 11.7T
An 8-Channel Transmit Array in Combination with a 31-Channel Receive Array for Human Brain Imaging at 11.7T Open
Motivation: RF challenges increase with field strength, and novel RF coil solutions are essential to capture the potential benefits at 11.7TGoal(s): To develop an efficient 8-channel transmit array in combination with a 31-channel receive …
View article: Opening new horizons with the first human brain in vivo experiments at 11.7T
Opening new horizons with the first human brain in vivo experiments at 11.7T Open
Motivation: Ultra-high magnetic field MRI offers new opportunities due to its higher SNR and CNR. Goal(s): After receiving the authorization for scanning 20 adult healthy volunteers on the whole-body Iseult MRI scanner, we performed a prel…
View article: Pushing the image quality by integrating FatNav and pTx Universal Pulses in MPRAGE and MP2RAGE sequences at 7T
Pushing the image quality by integrating FatNav and pTx Universal Pulses in MPRAGE and MP2RAGE sequences at 7T Open
Motivation: Ultra-high field MRI of the brain suffers from an increased B1+ inhomogeneity as well as involuntary motion artifacts when very high spatial resolution is targeted. Goal(s): Integration of a FatNav technique into pTx Universal …
View article: Impact of third order shim coils on gradient-magnet interactions and gradient waveform fidelity
Impact of third order shim coils on gradient-magnet interactions and gradient waveform fidelity Open
Motivation: Third order shim coils can impact gradient-magnet interactions with consequences on image quality and magnet safety. Goal(s): To demonstrate the influence of third order shim coils on the SC72 gradient coil using field and vibr…
View article: Measurements of the gradient-induced power deposition in the He-bath of the Iseult 11.7T magnet and comparison with theory
Measurements of the gradient-induced power deposition in the He-bath of the Iseult 11.7T magnet and comparison with theory Open
Motivation: Experimental characterization and understanding of the power deposition in the He bath of an ultra-high field magnet is important for magnet safety. Goal(s): We report a quasi-analytical model for the Z gradient axis power depo…
View article: Parallel transmit improves 7T MRI adult epilepsy pre-surgical evaluation
Parallel transmit improves 7T MRI adult epilepsy pre-surgical evaluation Open
Objective To implement parallel transmit (pTx) 7T MRI in the pre-surgical evaluation of patients with drug resistant focal epilepsy, and to compare quality and diagnostic yield to conventional single transmit (specifically, circularly pola…
View article: In vivo imaging of the human brain with the Iseult 11.7-T MRI scanner
In vivo imaging of the human brain with the Iseult 11.7-T MRI scanner Open
View article: Design of calibration‐free RF pulses for T 2$$ {}_2 $$‐weighted single‐slab 3D turbo‐spin‐echo sequences at 7T utilizing parallel transmission
Design of calibration‐free RF pulses for T 2$$ {}_2 $$‐weighted single‐slab 3D turbo‐spin‐echo sequences at 7T utilizing parallel transmission Open
Purpose T‐weighted turbo‐spin‐echo (TSE) sequences are a fundamental technique in brain imaging but suffer from field inhomogeneities at ultra‐high fields. Several methods have been proposed to mitigate the problem, but were limited so far…
View article: Power deposition in the He bath induced by the Z gradient coil in the 11.7 T Iseult magnet: theory versus measurements
Power deposition in the He bath induced by the Z gradient coil in the 11.7 T Iseult magnet: theory versus measurements Open
Gradient-magnet interactions increase with higher field magnets and stronger gradient coils. Perhaps the most sensitive aspect is magnet quench, which can be induced by a loss of superconductivity of the main coil caused by a rise of the t…
View article: Non-Cartesian 3D-SPARKLING vs Cartesian 3D-EPI encoding schemes for functional Magnetic Resonance Imaging at 7 Tesla
Non-Cartesian 3D-SPARKLING vs Cartesian 3D-EPI encoding schemes for functional Magnetic Resonance Imaging at 7 Tesla Open
The quest for higher spatial and/or temporal resolution in functional MRI (fMRI) while preserving a sufficient temporal signal-to-noise ratio (tSNR) has generated a tremendous amount of methodological contributions in the last decade rangi…
View article: First in vivo images of the human brain revealed with the Iseult 11.7T MRI scanner
First in vivo images of the human brain revealed with the Iseult 11.7T MRI scanner Open
The understanding of the human brain is one of the main scientific challenges of the 21st century. In this context, in the early 2000s the French Atomic Energy Commission (CEA) launched a program to conceive and build the first …
View article: Intra‐scan RF power amplifier drift correction
Intra‐scan RF power amplifier drift correction Open
Purpose The drift in radiofrequency (RF) power amplifiers (RFPAs) is assessed and several contributing factors are investigated. Two approaches for prospective correction of drift are proposed and their effectiveness is evaluated. Methods …
View article: The possible influence of third-order shim coils on gradient–magnet interactions: an inter-field and inter-site study
The possible influence of third-order shim coils on gradient–magnet interactions: an inter-field and inter-site study Open
View article: Impact of B0$$ {\mathrm{B}}_0 $$ field imperfections correction on BOLD sensitivity in 3D‐SPARKLING fMRI data
Impact of B0$$ {\mathrm{B}}_0 $$ field imperfections correction on BOLD sensitivity in 3D‐SPARKLING fMRI data Open
Purpose Static and dynamic field imperfections are detrimental to functional MRI (fMRI) applications, especially at ultra‐high magnetic fields (UHF). In this work, a field camera is used to assess the benefits of retrospectively correcting…
View article: Pushing <scp>MP2RAGE</scp> boundaries: Ultimate time‐efficient parameterization combined with exhaustive <scp>T<sub>1</sub></scp> synthetic contrasts
Pushing <span>MP2RAGE</span> boundaries: Ultimate time‐efficient parameterization combined with exhaustive <span>T<sub>1</sub></span> synthetic contrasts Open
Purpose MP2RAGE parameter optimization is redefined to allow more time‐efficient MR acquisitions, whereas the T 1 ‐based synthetic imaging framework is used to obtain on‐demand T 1 ‐weighted contrasts. Our aim was to validate this concept …
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: Brainstem fMRI signaling of surprise across different types of deviant stimuli
Brainstem fMRI signaling of surprise across different types of deviant stimuli Open
View article: Impact of $\Delta \textrm{B}_0$ field imperfections correction on BOLD sensitivity in 3D-SPARKLING fMRI data
Impact of $\Delta \textrm{B}_0$ field imperfections correction on BOLD sensitivity in 3D-SPARKLING fMRI data Open
International audience
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: Electromagnetic and <scp>RF</scp> pulse design simulation based optimization of an eight‐channel loop array for 11.7T brain imaging
Electromagnetic and <span>RF</span> pulse design simulation based optimization of an eight‐channel loop array for 11.7T brain imaging Open
Purpose Optimization of transmit array performance is crucial in ultra‐high‐field MRI scanners such as 11.7T because of the increased RF losses and RF nonuniformity. This work presents a new workflow to investigate and minimize RF coil los…
View article: Electromagnetic and RF Pulse Design Simulation Based Optimisation of an Eight Channel Loop Array for 11.7 T Brain Imaging
Electromagnetic and RF Pulse Design Simulation Based Optimisation of an Eight Channel Loop Array for 11.7 T Brain Imaging Open
Purpose: Optimisation of transmit array performance is crucial in ultra-high-field MRI scanners such as 11.7 T due to the increased radiofrequency (RF) losses and RF nonuniformity. This work presents a new workflow to investigate and minim…