Distortion Correction and Field Maps

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Distortion? What distortion?[edit]

The various tissues and air spaces in the head cause inhomogeneities in the B0 magnetic field. The inhomogeneities cause distortions in functional images.
A field map scan measures the inhomogeneities in B0. There are several tools that apply the information from a field map to correct EPI distortion.


Corrections using FSL: Prelude and Fugue[edit]

http://www.fmrib.ox.ac.uk/fsl/fugue/index.html


Corrections using Brain Voyager: Antabacus[edit]

File:Anatabacus v10 manual.pdf