Abstract #3386

Optimized gradient spoiling for B1 mapping with UTE AFI that is less sensitive to the RF-spoiling phase increment

Marta Brigid Maggioni¹, Martin Krämer¹, and Jürgen R. Reichenbach^1,2,3,4

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

B₁ mapping is a major challenge for reliable T₁ quantification, and it is especially difficult for UTE sequences, because most conventional B₁ mapping methods are unable to perform on short T₂^* tissues. Recently, an implementation of the actual flip angle imaging (AFI) method was proposed for UTE sequences. The AFI method requires ideal spoiling of residual transverse magnetization, which is typically achieved by fine-tuning RF-spoiling phase increments as well as the strength of spoiler gradients. In this work, we propose an improved gradient spoiling scheme, which reduces the effect of the RF-spoiling phase increment on the AFI results.

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