Minimum envelope roughness pulse design for reduced amplifier distortion in parallel excitation.

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
William A GrissomJohn Pauly

Abstract

Parallel excitation uses multiple transmit channels and coils, each driven by independent waveforms, to afford the pulse designer an additional spatial encoding mechanism that complements gradient encoding. In contrast to parallel reception, parallel excitation requires individual power amplifiers for each transmit channel, which can be cost prohibitive. Several groups have explored the use of low-cost power amplifiers for parallel excitation; however, such amplifiers commonly exhibit nonlinear memory effects that distort radio frequency pulses. This is especially true for pulses with rapidly varying envelopes, which are common in parallel excitation. To overcome this problem, we introduce a technique for parallel excitation pulse design that yields pulses with smoother envelopes. We demonstrate experimentally that pulses designed with the new technique suffer less amplifier distortion than unregularized pulses and pulses designed with conventional regularization.

References

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Citations

Feb 24, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Anuj SharmaWilliam A Grissom
Oct 21, 2010·IEEE Transactions on Medical Imaging·Marta G ZanchiGreig C Scott
Jul 7, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Adrian MartinBastien Guerin
May 21, 2015·NMR in Biomedicine·Francesco PadormoShaihan J Malik
Apr 16, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Xinqiang YanWilliam A Grissom
Nov 1, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Michael Twieg, Mark A Griswold
Oct 30, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·William A GrissomAlexey A Samsonov
Jan 18, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Samy Abo SeadaShaihan J Malik
Feb 11, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Armin RundRudolf Stollberger
Oct 3, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Samy Abo SeadaShaihan J Malik
Sep 28, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Johannes T SchneiderPeter Ullmann
Apr 29, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Zhipeng CaoWilliam A Grissom
Oct 25, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Nicolas BoulantAlexandre Vignaud
Aug 11, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Natalia GudinoJeff H Duyn
Oct 29, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Zhipeng CaoWilliam A Grissom
Aug 2, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Xinqiang YanWilliam A Grissom

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