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  Triple-quantum-filtered sodium imaging at 9.4 Tesla

Mirkes, C., Shajan, G., Bause, J., Buckenmaier, K., Hoffmann, J., & Scheffler, K. (2016). Triple-quantum-filtered sodium imaging at 9.4 Tesla. Magnetic Resonance in Medicine, 75(3), 1278-1289. doi:10.1002/mrm.25688.

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Mirkes, C1, 2, Autor           
Shajan, G1, 2, Autor           
Bause, J1, 2, Autor           
Buckenmaier, K1, 2, Autor           
Hoffmann, J1, 2, Autor           
Scheffler, K1, 2, Autor           
Affiliations:
1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Zusammenfassung: Purpose
Efficient acquisition of triple-quantum-filtered (TQF) sodium images at ultra-high field (UHF) strength.
Methods
A three-pulse preparation and a stack of double-spirals were used for the acquisition of TQF images at 9.4 Tesla. The flip angles of the TQ preparation were smoothly reduced toward the edge of k-space along the partition-encoding direction. In doing so, the specific absorption rate could be reduced while preserving the maximal signal intensity for the partitions most relevant for image contrast in the center of k-space. Simulations, phantom and in vivo measurements were used to demonstrate the usefulness of the proposed method.
Results
A higher sensitivity (∼20) was achieved compared to the standard acquisition without flip angle apodization. Signals from free sodium ions were successfully suppressed irrespective of the amount of apodization used. B0 corrected TQF images with a nominal resolution of 5 × 5 × 5 mm3 and an acceptable signal-to-noise ratio could be acquired in vivo within 21 min.
Conclusion
Conventional TQF in combination with flip angle apodization permits to exploit more efficiently the increased sensitivity available at 9.4T.

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 Datum: 2016-03
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.1002/mrm.25688
BibTex Citekey: MirkesSBBHS2015
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Titel: Magnetic Resonance in Medicine
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: New York : Wiley-Liss
Seiten: - Band / Heft: 75 (3) Artikelnummer: - Start- / Endseite: 1278 - 1289 Identifikator: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149