Abstract #3191

B1-sensitive Encoding for Magnetic Resonance Fingerprinting

Gregor Körzdörfer¹, Thorsten Feiweier¹, Yun Jiang², and Mathias Nittka¹

¹Siemens Healthcare GmbH, Erlangen, Germany, ²Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, United States

Quantitative parameter maps obtained from Magnetic Resonance Fingerprinting (MRF) are sensitive to B1+ inhomogeneities. In principle, one could reduce this dependency by using a dictionary with an additional B1+ dimension. However, if the dictionary entries are not well distinguishable, the simultaneous pattern matching of three parameters (T1, T2, B1+) will not work reliably. In order to improve the separation of data in the B1+ dimension, we implemented a novel B1+ sensitive encoding. This approach employs a dedicated composite RF excitation pulse which directly encodes B1+ magnitude information into the phase of the acquired signal. Here we present an experimental proof of principle using a 1D projection MRF sequence.

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