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  Flow compensation in balanced SSFP sequences

Bieri, O., & Scheffler, K. (2005). Flow compensation in balanced SSFP sequences. Magnetic Resonance in Medicine, 54(4), 901-907. doi:10.1002/mrm.20619.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-D3EF-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-D778-3
Genre: Journal Article

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Bieri, O, Author
Scheffler, K1, Author              
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1External Organizations, ou_persistent22              

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 Abstract: In balanced steady-state free precession (b-SSFP) sequences, uncompensated first-order moments of encoding gradients induce a nonconstant phase evolution for moving spins within the excitation train, resulting in signal loss and image artifacts. To restore these flow-related phase perturbations, “pairing” of consecutive phase-encoding (PE) steps is compared with a fully flow-compensated sequence using compensating gradient waveforms along all three encoding directions. In volunteer studies, the quality of images acquired with the “pairing” technique was comparable to that of images obtained with the fully flow-compensated technique, regardless of the selected view-ordering scheme used for data acquisition. Nevertheless, the results of phantom experiments indicate that the pairing technique becomes ineffective at flow velocities exceeding roughly 0.5–1 m/s. Consequently, the additional scan time required to null the first gradient moments in a flow-compensated b-SSFP sequence makes the “pairing” technique preferable for applications in which slow to moderate flow velocities can be expected.

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 Dates: 2005-10
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/mrm.20619
BibTex Citekey: BieriS2005
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: 54 (4) Sequence Number: - Start / End Page: 901 - 907 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149