Abstract #3305

Accelerated 3D-UTE-AFI B1 mapping to correct VFA-based T1 estimations in short T2* tissues

Marta Brigid Maggioni¹, Martin Krämer^1,2, and Jürgen R. Reichenbach^1,2,3,4,5

¹Medical Physics Group, Institute of Diagnostic and Interventional Radiology, Jena University Hospital - Friedrich Schiller University, Jena, Germany, ²Institute of Diagnostic and Interventional Radiology, Jena University Hospital - Friedrich Schiller University, Jena, Germany, ³Michael Stifel Center for Data-driven and Simulation Science Jena, Friedrich Schiller University, Jena, Germany, ⁴Abbe School of Photonics, Friedrich Schiller University, Jena, Germany, ⁵Center of Medical Optics and Photonics, Friedrich Schiller University, Jena, Germany

B₁ mapping is a considerable challenge for T₁ quantification, and it is especially difficult for short T₂^* species because only ultrashort echo-time (UTE) imaging sequences are able to retrieve signal in such tissues. Recently a method called Actual Flip Angle Imaging (AFI) has shown promising results because of its potential to be combined with UTE acquisition. However the AFI method is characterized by long acquisition times. In this work we propose to use undersampling to reduce the acquisition times of AFI-based B₁ mapping.

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