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Abstract #4427

B1-Mapping with the Transient Phase of SSFP

Carl Ganter1, Marcus Settles1, Klaus Scheffler2, Oliver Bieri2

1Department of Radiology, Technische Universitt Mnchen, Munich, Germany; 2Division of Radiological Physics, University of Basel Hospital, Basel, Switzerland

In rapid SSFP sequences, the approach toward dynamical equilibrium (transient phase) typically consists of a smooth decay and a superimposed damped oscillation. Recent theoretical studies for the FID signal of unbalanced SSFP showed that the frequency of the latter is closely connected to the actual flip angle α and depends only weakly on tissue parameters. In this work, we show that fast and accurate B1-mapping, based on a frequency analysis of the transient phase of SSFP, can be implemented in a conceptually simple and flexible manner.