0000000000193401
AUTHOR
O. Beuf
Impulsions d'excitation basse énergie robustes aux inhomogénéités B1
International audience
MRI phase control with Optimal Control Theory
International audience
BEEEP: B1-robust Energy Efficient Excitation Pulses
International audience; SynopsisThis study introduces a new family of broadband B1-robust excitation (90°) pulses for MRI with large enough bandwidth (+/- 1 kHz) to account forstatic field inhomogeneities, and minimal energy deposition. RF pulses are designed with a regularized optimal control algorithm, which is able toadapt the pulse B1-robustness range to fit the coil limits in terms of peak amplitude and energy. In vitro acquisitions using an endoluminal-shapedRF transmit coil show comparable excitation profiles than BIR4 pulses, although BEEEP pulses deposit 5.2 times less energy.https://index.mirasmart.com/ISMRM2019/PDFfiles/4623.html
A Simplified Framework for Contrast Optimization in MRI
International audience
Contrôle optimal appliqué à l’Elastographie par Résonance Magnétique avec un gradient constant: expériences ex vivo et in vitro
International audience
Contrast Preparation Pulses Robust to B1 and B0 inhomogeneities: an Optimal Control Approach
International audience