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Abstract #3870

Analytical B0 shimming from 3D survey scans: feasibility and impact on EPI image quality

Sharun S Thazhackal1, Ashvin Srinivasan1, Suja Saraswathy1, Manivannan Jayapalan2, Umesh Rudrapatna2, and Jaladhar Neelavalli2
1Philips Research, Bangalore, India, 2Philips Healthcare, Bangalore, India


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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