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Abstract #2929

Turbo Spin Echo Bloch Siegert Shift B1+ Mapping

Thomas Christian Basse-Lsebrink1, Volker Sturm1, Thomas Kampf1, Guido Stoll2, Peter Michael Jakob1

1Experimental Physics 5, University of Wuerzburg, Wuerzburg, Bavaria, Germany; 2Neurology, University of Wuerzburg, Wuerzburg, Bavaria, Germany

An interesting method for B1+ mapping based on the Bloch-Siegert (BLS) shift was recently presented for gradient echo (FLASH) and Spin Echo (SE) sequences. This method uses off-resonant pulses before signal acquisition to encode the B1 information into the signal phase. Fast B1+ mapping is possible since the repetition time has only minor influence on the quality of the phase information. In the present study, the use of BLS B1+ mapping was extended to CPMG-based Turbo-Spin-Echo (BLS-CPMG-TSE) imaging. For fast B1+ mapping phantom as well as in vivo 2D and 3D experiments were performed to evaluate the proposed method.