Improved gradient-echo 3D magnetic resonance imaging using pseudo-echoes created by frequency-swept pulses

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Jang-Yeon ParkM Garwood

Abstract

Frequency-swept pulses are not typically employed to excite spins in NMR. When used for selective excitation in MRI, such pulses do not produce a proper echo because the phase of the transverse magnetization varies in a quadratic manner across the slice or slab. Previously, frequency-swept pulses such as the chirp pulse have been shown to offer an approach to reduce the peak radiofrequency power required for excitation. It has also been shown that chirp excitation produces a unique type of echo (dubbed "pseudo-echo" here) and images can be generated from the resultant pseudo-echoes using a quadratic reconstruction method (J.G. Pipe, Magn Reson Med 1995;33:24-33). The present work describes a general theory and methods for exciting spins with other types of frequency-swept pulses (HSn pulses), which offer the advantage of delivering better excitation profiles than the chirp pulse. Here, pseudo-echoes are produced with HSn pulses in conventional gradient-echo 3D MRI, and high-quality images are reconstructed using standard fast Fourier transformation. An optional apodization procedure using a sliding window function is also introduced. When the dynamic range of the analog-to-digital converter is limiting, signal-to-noise ratio of...Continue Reading

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Dec 30, 2015·Magnetic Resonance Imaging·Ute Goerke
Dec 4, 2012·Journal of Magnetic Resonance·Jean-Nicolas Dumez, Lucio Frydman
Jun 24, 2010·Journal of Magnetic Resonance·Julien ValetteVincent Lebon
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Jun 19, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Ying ChenZhong Chen
Jun 12, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Naoharu Kobayashi, Michael Garwood
Aug 6, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Angela L S SnyderMichael Garwood
Sep 10, 2014·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Stephen J Wastling, Gareth J Barker
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May 14, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jinjin ZhangJang-Yeon Park
May 13, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Albert JangMichael Garwood
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Dec 20, 2008·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jang-Yeon Park, Michael Garwood
Mar 19, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jae-Kyun RyuJang-Yeon Park
Jan 25, 2014·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Yoojin LeeJang-Yeon Park
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Nov 27, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Carl Ganter

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