Magma (New York, N.Y.)
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Magma (New York, N.Y.) · Jun 2011
An improved PSF mapping method for EPI distortion correction in human brain at ultra high field (7T).
To further improve the quality and robustness of the point-spread function (PSF) mapping method for fully automatic and accurate correction of geometric distortions in EPI at ultra high field such as 7 Tesla with high fidelity. ⋯ More precise mapping and correction of pixel shifts and blurring is accomplished with the proposed improvements. Errors in the shift map that are caused by PSF-ghost artifacts in the multi-shot PSF acquisition, e.g., from small motion during the reference scan, do not affect the improved shift estimation method.