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Abstract #2865

Interferometric, Hybrid, and Weighted $$$B_1^+$$$ Mapping for Expedited RF Calibration of Parallel Transmit Ultrahigh-Field MRI

Dario Bosch1,2, Fabian Müller1, and Klaus Scheffler1,2
1Magnetic Resonance Center, MPI for Biological Cybernetics, Tuebingen, Germany, 2Department for Biomedical Magnetic Resonance, University Tuebingen, Tuebingen, Germany


With an increasing number of transmit channels, faster methods for acquiring $$$B_1^+$$$ maps on pTx MRI systems grow in importance. We compared different interferometry modes for accurate absolute $$$B_1^+$$$ mapping using satTFL. We also introduced weighted hybrid $$$B_1^+$$$ mapping as an attempt to improve hybrid $$$B_1^+$$$ mapping. In this, a second absolute $$$B_1^+$$$ map was introduced as an attempt to further shorten measurement duration while keeping acceptable accuracy. From the tested interferometry modes, phase-cycling performed best in both absolute and weighted mapping. Weighted hybrid mapping exceeded conventional hybrid mapping substantially and could therefore be sufficiently accurate for many applications.

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