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Abstract #3551

Off-resonance correction of non-cartesian SWI using internal field map estimation

Guillaume Daval-Frérot1,2,3, Aurélien Massire1, Mathilde Ripart2, Boris Mailhe4, Mariappan Nadar4, Alexandre Vignaud2, and Philippe Ciuciu2,3
1Siemens Healthcare SAS, Saint-Denis, France, 2CEA, NeuroSpin, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France, 3Inria, Parietal, Palaiseau, France, 4Digital Technology and Innovation, Siemens Healthineers, Princeton, NJ, United States

Patient-induced inhomogeneities in the magnetic field cause distortions and blurring during acquisitions with long echo times, as in susceptibility-weighted imaging. Most correction methods require collecting an additional $$$\Delta{B_0}$$$ field map. To avoid that, we propose a method to approximate this field map using the single echo acquisition only. The main component of the observed phase is linearly related to $$$\Delta{B_0}$$$ and TE, and the relative impact of non-$$$\Delta{B_0}$$$ terms becomes insignificant with TE>20ms at 3T. The estimated 3D field maps, produced at 0.6 mm isotropic under 3 minutes, provide corrections equivalent to acquired ones.

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