Abstract #0892

On the impact of B0 map resolution and undersampling on reconstructions using expanded encoding models

Paul Dubovan^1,2, Lars Kasper³, Kamil Uludag^3,4, and Corey Baron^1,2

¹Medical Biophysics, Western University, London, ON, Canada, ²Center for Functional and Metabolic Mapping, Robarts Research Institute, London, ON, Canada, ³Techna Institute, University Health Network, Toronto, ON, Canada, ⁴Medical Biophysics, University of Toronto, Toronto, ON, Canada

Spiral diffusion images are known to suffer from image distortions due to the enhanced sensitivity to magnetic field inhomogeneities. Application of parallel imaging to accelerate readout times, and inclusion of robust B₀ field maps are two techniques that generally contribute to spiral image improvements. In this work, the impact of field map resolution and acceleration factors are investigated to identify acquisition parameters that optimize image quality. A moderate acceleration factor (3 or 4) coupled with a field map on the order of the imaging resolution (1.5 mm in-plane) provided the best trade-off between geometric accuracy, blurring reduction, and noise amplification.

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