Universal pulses: A new concept for calibration-free parallel transmission

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Vincent GrasNicolas Boulant

Abstract

A calibration-free parallel transmission method is investigated to mitigate the radiofrequency (RF) field inhomogeneity problem in brain imaging at 7 Tesla (T). Six volunteers were scanned to build a representative database of RF and static field maps at 7T. Small-tip-angle and inversion pulses were designed with joint kT -points trajectory optimization to work robustly on all six subjects. The returned "universal" pulses were then inserted in an MPRAGE sequence implemented on six additional volunteers without further field measurements and pulse optimizations. Similar acquisitions were performed in the circularly polarized mode and with subject-based optimizations for comparison. Performance of the different approaches was evaluated by means of image analysis and computation of the flip angle normalized root mean square errors (NRMSE). For both the excitation and inversion, the universal pulses (NRMSE∼11%) outperformed the circularly polarized (NRMSE∼28%) and RF shim modes (NRMSE∼20%) across all volunteers and returned slightly worse results than for subject-based optimized pulses (NRMSE∼7%). RF pulses can be designed to robustly mitigate the RF field inhomogeneity problem over a population class. This appears as a first step ...Continue Reading

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Citations

Oct 19, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Morgane Le GarrecNicolas Boulant
Oct 23, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·M Arcan ErtürkGregory J Metzger
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Jan 24, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Vincent GrasNicolas Boulant
Dec 2, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Vincent GrasNicolas Boulant
Feb 25, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Arian BeqiriShaihan J Malik
Sep 29, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Eric Van ReethDominique Sugny
Jan 18, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Vincent GrasNicolas Boulant
Jun 13, 2019·Topics in Magnetic Resonance Imaging : TMRI·M Arcan ErturkGregory J Metzger
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