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- W2023382651 abstract "Abstract At high magnetic field strengths (≥3T), the radiofrequency wavelength used in MRI is of the same order of magnitude of (or smaller than) the typical sample size, making transmit magnetic field ( B ) inhomogeneities more prominent. Methods such as radiofrequency‐shimming and transmit SENSE have been proposed to mitigate these undesirable effects. A prerequisite for such approaches is an accurate and rapid characterization of the B field in the organ of interest. In this work, a new phase‐sensitive three‐dimensional B ‐mapping technique is introduced that allows the acquisition of a 64 × 64 × 8 B ‐map in ∼20 s, yielding an accurate mapping of the relative B with a 10‐fold dynamic range (0.2–2 times the nominal B ). Moreover, the predominant use of low flip angle excitations in the presented sequence minimizes specific absorption rate, which is an important asset for in vivo B ‐shimming procedures at high magnetic fields. The proposed methodology was validated in phantom experiments and demonstrated good results in phantom and human B ‐shimming using an 8‐channel transmit‐receive array. Magn Reson Med, 2011. © 2011 Wiley‐Liss, Inc." @default.
- W2023382651 created "2016-06-24" @default.
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- W2023382651 date "2011-08-29" @default.
- W2023382651 modified "2023-10-10" @default.
- W2023382651 title "SA2RAGE: A new sequence for fast B1+-mapping" @default.
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- W2023382651 doi "https://doi.org/10.1002/mrm.23145" @default.
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