Designing 3D selective adiabatic radiofrequency pulses with single and parallel transmission

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Albert JangMichael Garwood

Abstract

To introduce a method of designing single and parallel transmit (pTx) 3D adiabatic π pulses for inverting and refocusing spins that are insensitive to transmit B1 ( B1+) inhomogeneity. A 3D adiabatic pulse is created by replacing each piece-wise constant element (or sub-pulse) of an adiabatic full passage (AFP) by a 2D selective pulse. In this study, the parent AFP is an HS1 and each sub-pulse is a 2D pulse derived from a jinc function designed using a spiral k-trajectory. Spatial selectivity in the third direction is achieved by blipping the slab-selective gradient between sub-pulses, yielding a rectangular slab profile identical to that of the parent AFP. The slew-rate limited sub-pulse can be undersampled utilizing pTx, thus shortening the overall pulse width. Simulations and experiments demonstrate the quality of spatial selectivity and adiabaticity achievable. The 3D adiabatic pulse inverts and refocus spins in a sharply demarcated cylindrical volume. When stepping RF amplitude, an adiabatic threshold is observed above which the flip angle remains π. Experimental results demonstrate that pTx is an effective means to significantly improve pulse performance. A method of designing 3D adiabatic pulses insensitive to B1 inhomog...Continue Reading

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Citations

Dec 18, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Xiaoxuan HeGregory J Metzger
Jan 21, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Qingjia BaoLucio Frydman
Jun 13, 2019·Topics in Magnetic Resonance Imaging : TMRI·Cem M Deniz
Jul 16, 2019·Journal of Magnetic Resonance·Michael MullenMichael Garwood
Jan 27, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Xiaoxuan HeGregory J Metzger

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