Publications de Frédéric Gretsch

Fat navigators based retrospective motion correction strategies for brain magnetic resonance imaging

Magnetic resonance resonance (MRI) is a widely used modality to obtain in vivo tissue information. Clinical applications are near countless, and almost all body parts can be examined using an MR scanner. As the method is non invasive, does not use ionizing ...

EPFL2020

Improved susceptibility-weighted imaging for high contrast and resolution thalamic nuclei mapping at 7T

Meritxell Bach Cuadra, Elena Najdenovska, José Pedro Rebelo Ferreira Marques, Frédéric Gretsch, João Pedro Forjaco Jorge, Daniel Gallichan, Constantin Tuleasca

Purpose The thalamus is an important brain structure and neurosurgical target, but its constituting nuclei are challenging to image non-invasively. Recently, susceptibility-weighted imaging (SWI) at ultra-high field has shown promising capabilities for tha ...

Wiley2020

Fat navigators and Moire phase tracking comparison for motion estimation and retrospective correction

Frédéric Gretsch, Daniel Gallichan

Purpose To compare motion tracking by 2 modern methods (fat navigators [FatNavs] and Moir' phase tracking [MPT]) as well as their performance for retrospective correction of very high resolution acquisitions. Methods A direct comparison of FatNavs and MPT ...

Wiley2020

Tracking discrete off-resonance markers with three spokes (trackDOTS) for compensation of head motion and B0 perturbations: Accuracy and performance in anatomical imaging

José Pedro Rebelo Ferreira Marques, Frédéric Gretsch, João Pedro Forjaco Jorge, Daniel Gallichan

PURPOSE: To develop a novel approach for head motion and B0 field monitoring based on tracking discrete off-resonance markers with three spokes (trackDOTS). METHODS: Small markers filled with acetic acid were built and attached to a head cap. Marker positi ...

Wiley-Blackwell2018

Investigating the accuracy of FatNav-derived estimates of temporal B0 changes and their application to retrospective correction of high-resolution 3D GRE of the human brain at 7T

José Pedro Rebelo Ferreira Marques, Frédéric Gretsch, Daniel Gallichan

Wiley2018

Perturbative conformal symmetry and dilaton

Frédéric Gretsch, Alexander Monin

Spontaneous symmetry breaking with necessity leads to the presence of Goldstone field(s). In the case of scale or conformal symmetries the corresponding Goldstone mode is called the dilaton. Consistently coupling a system to the dilaton poses certain diffi ...

American Physical Society2015