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Abstract:
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.
