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Abstract #0133

Mitigation of Spiral Undersampling Artifacts in Magnetic Resonance Fingerprinting (MRF) by Adapted Interleave Reordering

Josef Pfeuffer1, Argyrios Kechagias1, Craig H. Meyer2, Gregor Körzdörfer1, and Mathias Nittka1

1Application Development, Siemens Healthcare, Erlangen, Germany, 2Biomedical Engineering, University of Virginia, Charlottesville, VA, United States

In MRF fast spiral scanning is done with variable FA/TR using a highly – up to 48-fold – undersampled trajectory. Spatial undersampling artifacts are mitigated by the MRF dictionary-matching process for the resulting quantitative T1/T2 maps. In this study, we demonstrate how undersampling artifacts can bias MRF results and present strategies to minimize them by spiral-interleave reordering adapted to the specific MRF encoding scheme. An experimental procedure is developed to test for a potential spatial bias in a specific spiral and MRF encoding scheme. The sources of spatial variances are mitigated with appropriate distribution of undersampling artifacts over the temporal MRF encoding.

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