Improved elimination of phase effects from background field inhomogeneities for susceptibility weighted imaging at high magnetic field strengths

Rauscher, Alexander, Barth, Markus, Herrmann, Karl-Heinz, Witoszynskyj, Stephan, Deistung, Andreas and Reichenbach, Jüergen R. (2008) Improved elimination of phase effects from background field inhomogeneities for susceptibility weighted imaging at high magnetic field strengths. Magnetic Resonance Imaging, 26 8: 1145-1151. doi:10.1016/j.mri.2008.01.029


Author Rauscher, Alexander
Barth, Markus
Herrmann, Karl-Heinz
Witoszynskyj, Stephan
Deistung, Andreas
Reichenbach, Jüergen R.
Title Improved elimination of phase effects from background field inhomogeneities for susceptibility weighted imaging at high magnetic field strengths
Journal name Magnetic Resonance Imaging   Check publisher's open access policy
ISSN 0730-725X
1873-5894
Publication date 2008-01-01
Sub-type Article (original research)
DOI 10.1016/j.mri.2008.01.029
Volume 26
Issue 8
Start page 1145
End page 1151
Total pages 7
Place of publication Philadelphia, PA, United States
Publisher Elsevier
Language eng
Abstract To enhance susceptibility-related contrast of magnetic resonance images, the phase of susceptibility weighted data needs to be corrected for background inhomogeneities and phase wraps caused by them. Current methods either use homodyne filtering or a combination of phase unwrapping and high pass filtering. The drawback of homodyne filtering is incomplete elimination of phase wraps in areas with steep phase topography produced by background inhomogeneities of the static magnetic field. The disadvantage of phase unwrapping is that it requires subsequent high pass filtering, which introduces artifacts in areas with very steep transitions, such as areas near interfaces between parenchyma and bone or air. A method is proposed that reduces the artifacts associated with high pass filtering without sacrificing the advantages of phase unwrapping. This technique is demonstrated with phantom data at 1.5 T and with human data at 1.5, 3 and 7 T.
Keyword 7 T
Field inhomogeneities
MRI
Phase
SWI
Unwrapping
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Advanced Imaging Publications
 
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