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
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
We propose to approximate the $$$\Delta{B_0}$$$ field map of a single echo acquisition using long echo time. The estimated 3D field maps, produced at 0.6 mm isotropic under 3 minutes, are then used for $$$\Delta{B_0}$$$ correction with performances similar to acquired ones.
Figure 4 : Comparison of the SWI with mIP without correction (A), with correction using the acquired field map (B) and with correction using the estimated field map (D) with the same slices as Fig3. (C) and (E) are respectively the difference between (A) and (B), and between (A) and (D).
Figure 1 : Pipeline of the field map estimation followed by an off-resonance correction. The magnitude and associated mask estimated with the adjoint are used to weight and stabilize the phase unwrapping algorithm.
