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Silent T 1 mapping using the variable flip angle method with B 1 correction
Author(s) -
Ljungberg Emil,
Wood Tobias,
Solana Ana Beatriz,
Kolind Shan,
Williams Steven C. R.,
Wiesinger Florian,
Barker Gareth J.
Publication year - 2020
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.28178
Subject(s) - flip angle , repeatability , reproducibility , imaging phantom , cartesian coordinate system , data acquisition , noise (video) , nuclear medicine , physics , nuclear magnetic resonance , computer science , mathematics , magnetic resonance imaging , medicine , statistics , artificial intelligence , radiology , image (mathematics) , geometry , operating system
Purpose To compare the silent rotating ultrafast imaging sequence (RUFIS) to a traditional Cartesian spoiled gradient‐echo (SPGR) acquisition scheme for variable flip angle (VFA) T 1 mapping. Methods A two‐point VFA measurement was performed using RUFIS and Cartesian SPGR in a quantitative phantom and healthy volunteers. To correct for B 1 errors, a novel silent magnetization prepared B 1 map acquisition (SIMBA) was developed, which combined with RUFIS VFA allows for a completely silent T 1 mapping protocol. Results 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. Conclusions VFA T 1 mapping using RUFIS is a feasible alternative to SPGR, achieving silent T 1 mapping with comparable acquisition time.