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Transmit gain calibration for nonproton MR using the Bloch–Siegert shift
Author(s) -
Schulte Rolf F.,
Sacolick Laura,
Deppe Martin H.,
Janich Martin A.,
Schwaiger Markus,
Wild Jim M.,
Wiesinger Florian
Publication year - 2011
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.1657
Subject(s) - calibration , physics , power (physics) , nuclear magnetic resonance , phase (matter) , radio frequency , computer science , computational physics , process (computing) , telecommunications , operating system , quantum mechanics
Transmit gain ( B 1 + ) calibration is necessary for the adjustment of radiofrequency (RF) power levels to the desired flip angles. In proton MRI, this is generally an automated process before the actual scan without any user interaction. For other nuclei, it is usually time consuming and difficult, especially in the case of hyperpolarised MR. In the current work, transmit gain calibration was implemented on the basis of the Bloch–Siegert phase shift. From the same data, the centre frequency, line broadening and SNR could also be determined. The T 1 and B 0 insensitivity, and the wide range of B 1 +over which this technique is effective, make it well suited for nonproton applications. Examples are shown for hyperpolarised 13 C and 3 He applications. Copyright © 2011 John Wiley & Sons, Ltd.