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.