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<HTML><TITLE>FDT - FMRIB's Diffusion Toolbox - User Guide</TITLE><BODY BACKGROUND="fdt_images/fsl-bg.jpg">
<p><h3>Eddy Current Correction</h3>
Eddy current in the gradient coils induce (approximate) stretches and shears
in the diffusion weighted images. These distortions are different for
different gradient directions. Eddy Current Correciton corrects for these
distortions, and for simple head motion, using affine registration to a
reference volume.
<p>To call the FDT GUI, either run <b>Fdt</b>, or run <b>fsl</b> and press the
<b>FDT</b> button.  Use the top left drop down menu to select Eddy Current Correction.  

<p><b>Diffusion Weighted data:</b> Use the browse button to select your 4D
analyze format series of diffusion weighted data.
<br><b>Corrected output data:</b> Use the browse button to specify a filename for
the corrected 4D dataset.
<br><b>Reference Volume:</b> (default 0). Set the volume number for the reference volume
that will be used as a target to register all other volumes to. <br><br>
<b>command line utility</b><br>
 eddy_correct &#60;4dinput&#62; &#60;4doutput&#62; &#60;reference_no&#62;