Robust field map generation using a triple-echo acquisition

Journal of Magnetic Resonance Imaging : JMRI
C WindischbergerE Moser

Abstract

To establish a fast and robust technique for generating magnetic field maps for the correction of geometric distortions in echo-planar magnetic resonance (MR) images. Multislice gradient-echo (GE) images were acquired at echo times of 6, 6.5, and 7.5 msec in order to cover a field shift range of +/-666 Hz in the resulting B0 maps. To account for possible phase wrap scenarios, seven phase triples were calculated for each pixel. Linear regression of the phase vs. echo time was performed for each set. The slope of the set with the minimum fitting error was taken as the true magnetic field in the respective pixel. Based on the fitting error distribution, the technique is shown to be feasible and effective for assessing the field distribution in the brain at 3 T, especially in inferior brain areas (amygdalae, hippocampus). Examples of echo-planar images distortion corrected using the calculated field maps are shown. The approach presented yields robust estimation of magnetic field maps and requires under a minute of additional acquisition time and only seconds of computational time. As such, it is easily possible to apply image distortion correction in routine functional MR imaging (fMRI) studies, enabling improved coregistration of...Continue Reading

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Citations

Feb 14, 2016·European Journal of Nuclear Medicine and Molecular Imaging·Sara LeibfarthDaniela Thorwarth
Feb 7, 2016·Journal of Magnetic Resonance·Qingjia BaoChaoyang Liu
Aug 29, 2012·Magnetic Resonance Imaging·Sebastian DomschLothar R Schad
Jul 18, 2009·Magnetic Resonance Imaging·Noam Ben-EliezerLucio Frydman
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Aug 14, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Wei FengE Mark Haacke
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May 13, 2011·Journal of Magnetic Resonance Imaging : JMRI·Guang JiaMichael V Knopp
Jan 4, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Weiguo LiAndrew C Larson
Aug 1, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Simon RobinsonSiegfried Trattnig
Feb 13, 2013·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Joseph DagherAli Bilgin
Sep 26, 2008·IEEE Transactions on Medical Imaging·Amanda K FunaiDouglas C Noll
May 13, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Ana Beatriz SolanaFlorian Wiesinger
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Dec 24, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Matteo CenciniGuido Buonincontri
May 25, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Sreekanth MadhusoodhananJoseph Suresh Paul

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