Volker Jrg Friedrich Sturm1, Thomas Christian Basse-Lsebrink2, Thomas Kampf2, Peter Michael Jakob2
1Experimental Physics 5, University of Wrzburg , Wrzburg, Germany; 2Experimental Physics 5, University of Wrzburg, Wrzburg, Germany
A new method for phase-based B1+ mapping based on the Bloch-Siegert (BS) shift (ϕ BS) was presented in the past. Being a phase-based method, the maximal ϕ BS can be restricted since phase wraps cannot easily be removed for all given situations. This can be critical for BS B1 mapping using surface coils. Thus, to also obtain high quality B1 data in insensitive areas phase wraps in more sensitive areas cannot always be prevented. To reduce this problematic, a method is proposed which allows variation of ϕ BS in a single echo train. Consequently, by combining the information of the various obtained ϕ BS it is possible to remove phase wraps.