Distortion Correction and Field Maps
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
