PMID: 9178243Jun 1, 1997Paper

Improved automatic off-resonance correction without a field map in spiral imaging

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
L C ManA Macovski

Abstract

Non-2DFT k-space readout strategies are useful in fast imaging but prone to blurring when reconstructed off resonance. Field inhomogeneities or susceptibility variations, coupled with a long readout time, are the major sources of this artifact. Correction methods based on a priori off-resonance information such as an acquired field map have been proposed in the literature. An alternative approach estimates the spatially varying off-resonance frequency from the data itself before applying a correction. In this latter approach there is a trade-off between the extent of correction and the chance of increased artifact due to estimation error. This paper introduces an improved algorithm for field map estimation which is both faster and more robust than the existing method. It uses a multi-stage estimation of the field map, starting from a coarse estimate both in frequency and space and proceeds towards higher resolution. The new algorithm is applied to phantom and in vivo images acquired with radial and spiral sequences to give sharper images.

References

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Citations

Sep 7, 2000·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·E Ahunbay, J G Pipe
Feb 17, 2001·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·G T Luk-Pat, D G Nishimura
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Mar 8, 2014·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Samuel W Fielden, Craig H Meyer
Feb 5, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Hua GuoFeng Huang
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Mar 9, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Joseph Y ChengJohn M Pauly
Mar 30, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Travis B Smith, Krishna S Nayak
Jun 25, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Angus Z LauCharles H Cunningham
Jun 22, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Trong-Kha TruongAllen W Song
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Apr 23, 2008·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Weitian Chen, Craig H Meyer
Feb 23, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Shuyu TangPeder E Z Larson
Sep 4, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Michael Marx, Kim Butts Pauly
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Jul 28, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Yongwan LimKrishna S Nayak
Jun 10, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Angus Z LauCharles H Cunningham
Nov 25, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Julian A J RichterHerbert Köstler
Aug 11, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Hecong QinJohn Kurhanewicz

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