The inhomogeneity in the main magnetic field (B0) leads to SNR loss and image artifacts. B0 inhomogeneity increases with the field strength, thus leading to more pronounced B0 inhomogeneity at 3T and beyond. However repeated B0 map acquisition for shimming and for image reconstruction is time consuming. We show that subject-specific B0 and the corresponding shim settings can be predicted accurately using pseudo-CT generated from MR images – potentially obviating the need for a B0 scan. We propose an alternative approach based on image co-registration techniques that yields comparable results using survey images, without the need of any additional scans.
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