Multifrequency reconstruction for frequency‐modulated bSSFP
Purpose Banding artifacts in images acquired by balanced steady‐state free precession (bSSFP) remain a challenge in MRI as they considerably reduce image quality, and diagnostic value deteriorates accordingly. As the steady‐state tolerates small shifts in frequency, it is possible to acquire frequen...
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Published in | Magnetic resonance in medicine Vol. 78; no. 6; pp. 2226 - 2235 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Wiley Subscription Services, Inc
01.12.2017
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Subjects | |
Online Access | Get full text |
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Summary: | Purpose
Banding artifacts in images acquired by balanced steady‐state free precession (bSSFP) remain a challenge in MRI as they considerably reduce image quality, and diagnostic value deteriorates accordingly. As the steady‐state tolerates small shifts in frequency, it is possible to acquire frequency‐modulated bSSFP. Unfortunately, standard reconstructions of such measurements suffer from signal loss. Our study proposes a multifrequency reconstruction and demonstrates its capability of suppressing banding artifacts while retaining the high signal level of standard bSSFP.
Methods
Numerical simulations in vitro and in vivo measurements were performed using both standard bSSFP and frequency‐modulated bSSFP. The modulated data were reconstructed using a multifrequency approach consisting of three steps: phase correction, multiple reconstructions for different assumed frequencies, and maximum intensity projection.
Results
Although standard bSSFP measurements showed banding artifacts that compromised the image quality, standard reconstructions of frequency‐modulated acquisitions suffered from signal loss. In contrast, images reconstructed from frequency‐modulated data using the proposed multifrequency reconstruction showed no visual bandings and featured a higher signal‐to‐noise ratio (SNR). The SNR gain for phantom and in vivo measurements ranged from 1.23 to 1.49.
Conclusions
The presented multifrequency reconstruction for frequency‐modulated bSSFP provides images showing no bandings and featuring high SNR in short scan times. Magn Reson Med 78:2226–2235, 2017. © 2017 International Society for Magnetic Resonance in Medicine. |
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Bibliography: | The Department of Diagnostic and Interventional Radiology receives a research grant from Siemens Healthcare, which is not specifically directed toward this study or any of the authors. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0740-3194 1522-2594 |
DOI: | 10.1002/mrm.26630 |