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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