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A theoretical and experimental comparison of different techniques for B 1 mapping at very high fields
Author(s) -
Pohmann Rolf,
Scheffler Klaus
Publication year - 2013
Publication title -
nmr in biomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.278
H-Index - 114
eISSN - 1099-1492
pISSN - 0952-3480
DOI - 10.1002/nbm.2844
Subject(s) - monte carlo method , flip angle , computation , field (mathematics) , computational physics , statistical physics , propagation of uncertainty , physics , algorithm , computer science , statistics , mathematics , medicine , magnetic resonance imaging , pure mathematics , radiology
With the increasing use of ultrahigh‐field MR with multiple transmit channels, mapping of the B 1 + field has become a critical factor in many studies, leading to the publication of a large number of sequences for the measurement of the flip angle in recent years. In this article, the accuracy, precision and practicability of some of the most prominent of these techniques are investigated both theoretically, using error propagation computations and Monte‐Carlo simulations, and experimentally for different settings. For an exemplary experiment, which is typical for high‐field applications, the flip angle uncertainty is calculated and measured for two‐ and three‐dimensional acquisitions for techniques based on both magnitude and phase data. Simulated and measured results show good agreement. An experimental assessment of T 1 and B 0 dependence yields weak variations with these parameters for only a few of the sequences. Measurements on human scanners show crucial influences of specific absorption rate limitations, especially at ultrahigh field. Copyright © 2012 John Wiley & Sons, Ltd.