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Abstract #1404

Contrast and Resolution Mixing for Magnetic Resonance Fingerprinting

Gregor Körzdörfer1,2, Mark Griswold3,4, Dan Ma3, Yun Jiang3, Josef Pfeuffer1, Thorsten Feiweier1, Thomas Kluge1, and Mathias Nittka1

1Application Development, Siemens Healthcare, Erlangen, Germany, 2Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany, 3Department of Biomedical Engineering, Case Western Reserve University, OH, United States, 4Dept. of Radiology, Case Western Reserve University and University Hospitals of Cleveland, OH, United States

Quantitative parameter maps obtained from Magnetic Resonance Fingerprinting (MRF) are sensitive to B1+ inhomogeneities. Extending a dictionary by an additional B1+ dimension is a promising approach to account for this. In order to improve the differentiation of data in the B1+ dimension, we implemented a novel B1+ sensitive encoding. This approach employs the extension of the conventional FISP encoding by RF spoiled parts. Since high undersampling factors prevent a direct implementation of this technique, the undersampling pattern is varied during the acquisition. We use a spiral acquisition scheme which samples most of the FISP encoded parts of the fingerprint with high resolution. RF spoiled parts as well as a small fraction of the FISP encoded parts are being sampled with low resolution.

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