Search results for: Raphael Tomi‐Tricot

Items from 1 to 6 out of 6 results

article

Data‐driven motion‐corrected brain MRI incorporating pose‐dependent B₀ fields

Yannick Brackenier, Lucilio Cordero‐Grande, Raphael Tomi‐Tricot, Thomas Wilkinson, more

Magnetic Resonance in Medicine > 88 > 2 > 817 - 831

Purpose To develop a fully data‐driven retrospective intrascan motion‐correction framework for volumetric brain MRI at ultrahigh field (7 Tesla) that includes modeling of pose‐dependent changes in polarizing magnetic (B₀) fields. Theory and Methods Tissue susceptibility induces spatially varying B₀ distributions in the head, which change with pose. A physics‐inspired B₀ model has been deployed...

article

Parallel transmit pulse design for saturation homogeneity (PUSH) for magnetization transfer imaging at 7T

David Leitão, Raphael Tomi‐Tricot, Pip Bridgen, Tom Wilkinson, more

Magnetic Resonance in Medicine > 88 > 1 > 180 - 194

Purpose This work proposes a novel RF pulse design for parallel transmit (pTx) systems to obtain uniform saturation of semisolid magnetization for magnetization transfer (MT) contrast in the presence of transmit field

(B_{1}^{+})

inhomogeneities. The semisolid magnetization is usually modeled as being purely longitudinal, with the applied

B_{1}^{+}

field saturating but not rotating its magnetization; thus, standard...

article

Interventional cardiac MRI using an add‐on parallel transmit MR system: In vivo experience in sheep

Felipe Godinez, Raphael Tomi‐Tricot, Marylène Delcey, Steven E. Williams, more

Magnetic Resonance in Medicine > 86 > 6 > 3360 - 3372

Purpose We present in vivo testing of a parallel transmit system intended for interventional MR‐guided cardiac procedures. Methods The parallel transmit system was connected in‐line with a conventional 1.5 Tesla MRI system to transmit and receive on an 8‐coil array. The system used a current sensor for real‐time feedback to achieve real‐time current control by determining coupling and null modes...

article

SmartPulse, a machine learning approach for calibration‐free dynamic RF shimming: Preliminary study in a clinical environment

Raphaël Tomi‐Tricot, Vincent Gras, Bertrand Thirion, Franck Mauconduit, more

Magnetic Resonance in Medicine > 82 > 6 > 2016 - 2031

Purpose A calibration‐free pulse design method is introduced to alleviate

B_{1}^{+}

artifacts in clinical routine with parallel transmission at high field, dealing with significant inter‐subject variability, found for instance in the abdomen. Theory and Methods From a dual‐transmit 3T scanner, a database of

B_{1}^{+}

and off‐resonance abdominal maps from 50 subjects was first divided into 3 clusters based...

article

Optimizing BOLD sensitivity in the 7T Human Connectome Project resting-state fMRI protocol using plug-and-play parallel transmission

Vincent Gras, Benedikt A. Poser, Xiaoping Wu, Raphaël Tomi-Tricot, more

NeuroImage > 2019 > 195 > C > 1-10

The Human Connectome Project (HCP) has a 7T component that aims to study the human brain's organization and function with high spatial and temporal resolution fMRI and diffusion-weighted acquisitions. For whole brain applications at 7T, a major weakness however remains the heterogeneity of the radiofrequency transmission field (B1+ ), which prevents from achieving an optimal signal and contrast homogeneously...

article

B₁ artifact reduction in abdominal DCE‐MRI using k_T‐points: First clinical assessment of dynamic RF shimming at 3T

Raphaël Tomi‐Tricot, Vincent Gras, Franck Mauconduit, François Legou, more

Journal of Magnetic Resonance Imaging > 47 > 6 > 1562 - 1571

Background The excitation inhomogeneity artifact occurring at 3T in the abdomen can lead to dramatic loss of signal and contrast, thereby hampering diagnosis. Purpose To assess excitation homogeneity and image quality achieved by nonselective prototypical k_T‐points pulses, compared to tailored static RF shimming, in clinical routine on a commercial dual‐transmit scanner. Study Type Retrospective...

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INFONA - science communication portal

Search results for: Raphael Tomi‐Tricot

Data‐driven motion‐corrected brain MRI incorporating pose‐dependent B₀ fields

Parallel transmit pulse design for saturation homogeneity (PUSH) for magnetization transfer imaging at 7T

Interventional cardiac MRI using an add‐on parallel transmit MR system: In vivo experience in sheep

SmartPulse, a machine learning approach for calibration‐free dynamic RF shimming: Preliminary study in a clinical environment

Optimizing BOLD sensitivity in the 7T Human Connectome Project resting-state fMRI protocol using plug-and-play parallel transmission

B₁ artifact reduction in abdominal DCE‐MRI using k_T‐points: First clinical assessment of dynamic RF shimming at 3T

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INFONA - science communication portal

Search results for: Raphael Tomi‐Tricot

Data‐driven motion‐corrected brain MRI incorporating pose‐dependent B0 fields

Parallel transmit pulse design for saturation homogeneity (PUSH) for magnetization transfer imaging at 7T

Interventional cardiac MRI using an add‐on parallel transmit MR system: In vivo experience in sheep

SmartPulse, a machine learning approach for calibration‐free dynamic RF shimming: Preliminary study in a clinical environment

Optimizing BOLD sensitivity in the 7T Human Connectome Project resting-state fMRI protocol using plug-and-play parallel transmission

B1 artifact reduction in abdominal DCE‐MRI using kT‐points: First clinical assessment of dynamic RF shimming at 3T

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Data‐driven motion‐corrected brain MRI incorporating pose‐dependent B₀ fields

B₁ artifact reduction in abdominal DCE‐MRI using k_T‐points: First clinical assessment of dynamic RF shimming at 3T