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Abstract #4226

On the use of frequency modulated pulses in sat-UTE

Lucas Soustelle1, Ericky Caldas de A. Araujo2,3, François Rousseau4, Jean-Paul Armspach1, Pierre G. Carlier2,3, and Paulo Loureiro de Sousa1

1Université de Strasbourg, CNRS, ICube, FMTS, Strasbourg, France, 2NMR laboratory, Institute of Myology, Paris, France, 3NMR laboratory, CEA/DRF/IBFJ/MIRCen, Paris, France, 4Institut Mines Télécom Atlantique, INSERM, LaTIM, Brest, France

Conventional slice selection in 2D-UTE sequences is challenging as eddy currents and gradient non-idealities make difficult to achieve an appropriate slice selection and a minimum TE. The sat-UTE sequence proposes a simplification that separates slice selection from excitation, ensuring an easily implementable 2D-UTE sequence. The selection part was originally proposed with a short gaussian pulse, constraining slice selectivity to a gaussian profile and demanding exceedingly high RF power for ensuring efficient saturation. In this work, we propose an alternative implementation using low-peak-amplitude and selective quadratic phase pulses for slice saturation, providing an efficient and sharp short-T2 slice selection in sat-UTE.

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