Strongly modulating pulses for counteracting RF inhomogeneity at high fields

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
N BoulantA Amadon

Abstract

A new pulse technique for counteracting RF inhomogeneity at high fields is reported. The pulses make use of the detailed knowledge of the voxels' B(1) and B(0) amplitude 2D histogram to generate, through an optimization procedure, gates where the flip angle is made uniform. Although most approaches to date require the use of parallel transmission, this method does not and therefore offers several advantages. The data necessary for the algorithm to determine an irradiation scheme requires only one transmit B(1) along with a B(0) inhomogeneity measurement. The use of a B(1) and B(0) amplitude 2D histogram instead of their spatial distribution also decreases substantially the complexity of the optimization problem, allowing the algorithm to find an RF solution in less than 30 s. Finally, the optimization procedure is based on an exact calculation and does not use any linear approximation. In this article, the theory behind the method in addition to spoiled gradient echo experimental data at 3T for 3D brain imaging are reported. The images obtained yield a reduction of the standard deviation of the sine of the flip angle by a factor of up to 15 around the desired value, compared to when a standard square pulse calibrated by the sca...Continue Reading

References

May 1, 1990·Investigative Radiology·R S StaewenM Garwood
Dec 1, 1985·Physical Review A: General Physics·J BaumA Pines
Aug 10, 2000·Journal of Magnetic Resonance Imaging : JMRI·D I Hoult, D Phil
Dec 13, 2001·Journal of Magnetic Resonance·M Garwood, L DelaBarre
Apr 30, 2002·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Qing X YangWei Chen
Jan 2, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Ulrich KatscherJohan S van den Brink
Apr 6, 2004·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Yudong Zhu
Jan 29, 2005·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Suwit SaekhoV Andrew Stenger
Nov 5, 2005·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Pierre-François Van de MoorteleKāmil Uğurbil
Mar 10, 2006·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Suwit SaekhoV Andrew Stenger
Aug 9, 2006·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·William GrissomDouglas C Noll
Sep 8, 2006·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Weihua MaoChristopher M Collins
Nov 1, 2006·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Thomas VaughanKamil Ugurbil
Dec 28, 2006·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Vasily L Yarnykh
Feb 28, 2007·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Christopher M CollinsMichael B Smith
Jul 27, 2007·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Dan XuZhi-Pei Liang

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Citations

Feb 19, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Vincent GrasNicolas Boulant
Jan 30, 2013·Journal of Magnetic Resonance·Matthias BechmannAngelika Sebald
Dec 20, 2011·Journal of Magnetic Resonance·Jay MooreJohn C Gore
May 11, 2010·Journal of Magnetic Resonance·Jay MooreJohn C Gore
Jan 28, 2009·Journal of Magnetic Resonance·Nicolas Boulant
Mar 3, 2009·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·N BoulantA Amadon
Apr 19, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Shaihan J MalikJoseph V Hajnal
Apr 28, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Hui Liu, Gerald B Matson
May 19, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·M A CloosA Amadon
Apr 8, 2014·Journal of Magnetic Resonance·Mirjam HolbachDieter Suter
Aug 12, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Wenbo LiQin Qin
Oct 16, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·N BoulantA Amadon
Jan 18, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Vincent GrasNicolas Boulant
Jul 17, 2019·Radiology·Michael N HoffEmanuel Kanal
Aug 28, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Redouane JamilNicolas Boulant

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