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Abstract #3552

Characterizing the acquisition protocol dependencies of B0 field mapping and the effects of eddy currents and spoiling

Divya Varadarajan1,2, Mukund Balasubramanian2,3, Daniel J. Park1, Thomas Witzel4, Jason P. Stockmann1,2, and Jonathan R. Polimeni1,2,5
1Martinos Center for Biomedical Imaging, Charlestown, MA, United States, 2Department of Radiology, Harvard Medical School, Boston, MA, United States, 3Boston Children’s Hospital, Boston, MA, United States, 4Qbio Inc., San Carlos, CA, United States, 5Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, United States

Maps of the B0 field are routinely used for MRI scanner calibration and for post-processing corrections of geometric distortions. However, several sources of bias are present in conventional field estimates, which will result in uncorrected image artifacts, yet it is unclear what the magnitude of these biases are, whether these are large enough to warrant concern, and how to reduce these errors to extract more accurate field estimates. Here we investigate the accuracy of the standard B0 field map acquisition, demonstrate that the estimated fields vary with several acquisition parameters, and investigate sources of these errors.

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