Silent T 1 mapping using the variable flip angle method with B 1 correction

To compare the silent rotating ultrafast imaging sequence (RUFIS) to a traditional Cartesian spoiled gradient-echo (SPGR) acquisition scheme for variable flip angle (VFA) mapping. A two-point VFA measurement was performed using RUFIS and Cartesian SPGR in a quantitative phantom and healthy volunteer...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2020-08, Vol.84 (2), p.813-824
Main Authors: Ljungberg, Emil, Wood, Tobias, Solana, Ana Beatriz, Kolind, Shannon, Williams, Steven C R, Wiesinger, Florian, Barker, Gareth J
Format: Article
Language:English
Subjects:
Algorithms
Brain
Healthy Volunteers
Humans
Magnetic Resonance Imaging
Phantoms, Imaging
Reproducibility of Results
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Summary:To compare the silent rotating ultrafast imaging sequence (RUFIS) to a traditional Cartesian spoiled gradient-echo (SPGR) acquisition scheme for variable flip angle (VFA) mapping. A two-point VFA measurement was performed using RUFIS and Cartesian SPGR in a quantitative phantom and healthy volunteers. To correct for errors, a novel silent magnetization prepared map acquisition (SIMBA) was developed, which combined with RUFIS VFA allows for a completely silent mapping protocol. The silent protocol was found to have comparable repeatability but higher reproducibility in vivo compared to the standard SPGR protocol, and showed no increase in acoustic noise levels above background noise levels compared to a 33 dBA increase for the SPGR acquisition. VFA mapping using RUFIS is a feasible alternative to SPGR, achieving silent mapping with comparable acquisition time.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.28178