Density weighted turbo spin echo imaging

Zeller, Mario, Gutberlet, Marcel, Staeb, Daniel, Ritter, Christian Oliver, Beer, Meinrad, Hahn, Dietbert and Koestler, Herbert (2013) Density weighted turbo spin echo imaging. Journal of Magnetic Resonance Imaging, 37 4: 965-973. doi:10.1002/jmri.23872


Author Zeller, Mario
Gutberlet, Marcel
Staeb, Daniel
Ritter, Christian Oliver
Beer, Meinrad
Hahn, Dietbert
Koestler, Herbert
Title Density weighted turbo spin echo imaging
Journal name Journal of Magnetic Resonance Imaging   Check publisher's open access policy
ISSN 1053-1807
1522-2586
Publication date 2013-04
Sub-type Article (original research)
DOI 10.1002/jmri.23872
Open Access Status
Volume 37
Issue 4
Start page 965
End page 973
Total pages 9
Place of publication Hoboken United States
Publisher John Wiley & Sons
Language eng
Subject 2741 Radiology Nuclear Medicine and imaging
Formatted abstract
Purpose
To optimize the spatial response function (SRF) while maintaining optimal signal to noise ratio (SNR) in T2 weighted turbo spin echo (TSE) imaging by prospective density weighting.

Materials and Methods
Density weighting optimizes the SRF by sampling the k-space with variable density without the need of retrospective filtering, which would typically result in nonoptimal SNR. For TSE, the T2 decay needs to be considered when calculating an optimized sampling pattern. Simulations were carried out and T2 weighted in vivo TSE measurements were performed on a 3 Tesla MRI system. To evaluate the SNR, reversed centric density weighted and retrospectively filtered Cartesian acquisitions with identical measurement parameters and SRFs were compared with TEeff = 90 ms and a density weighted k-space sampling optimized to yield a Kaiser function for SRF side lobe suppression for white matter.

Results
Density weighting of a reversed centric reordering scheme resulted in an SNR increase of (43 ± 13)% compared with the Cartesian acquisition with retrospective filtering while maintaining comparable contrast behavior.

Conclusion
Density weighting is applicable to TSE imaging and results in significantly increased SNR. The gain can be used to shorten the measurement time, which suggests applying density weighting in both time and SNR constrained MRI.
Keyword Density weighting
Modulation transfer function
SNR
Spatial response function
Turbo spin echo
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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