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  Dynamically phase-cycled radial balanced SSFP imaging for efficient banding removal

Benkert, T., Ehses, P., Blaimer, M., Jakob, P., & Breuer, F. (2015). Dynamically phase-cycled radial balanced SSFP imaging for efficient banding removal. Magnetic Resonance in Medicine, 73(1), 182-194. doi:10.1002/mrm.25113.

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Benkert, T, Author
Ehses, P1, Author              
Blaimer, M, Author
Jakob, PM, Author
Breuer, FA, Author
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1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              

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 Abstract: Purpose Balanced steady-state free precession (bSSFP) imaging suffers from banding artifacts due to its inherent sensitivity to inhomogeneities in the main magnetic field. These artifacts can be removed by the acquisition of multiple images at different frequency offsets. However, conventional phase-cycling is hindered by a long scan time. The purpose of this work is to present a novel approach for efficient banding removal in bSSFP imaging. Theory and Methods To this end, the phase-cycle during a single-shot radial acquisition of an image was dynamically changed. Thus, each projection is acquired with a different frequency offset. Using conventional radial gridding, an artifact-free image can be reconstructed out of this dataset. Results The approach is validated at clinical field strength [3.0 Tesla (T)] as well as at ultrahigh field (9.4T). Robust elimination of banding artifacts was obtained for different imaging regions, including brain imaging at ultrahigh field with an in-plane resolution of 0.25 × 0.25 mm2. Besides banding artifact-free imaging, the applicability of the proposed technique for fat-water separation is demonstrated. Conclusion Dynamically phase-cycled radial bSSFP has the potential for banding-free bSSFP imaging in a short scan time, in the presence of severe field inhomogeneities and at high resolution.

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 Dates: 2015-01
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/mrm.25113
BibTex Citekey: BenkertEBJB2014
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 73 (1) Sequence Number: - Start / End Page: 182 - 194 Identifier: -