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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
Eddy currents 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
different gradient directions. Eddy Current Correction 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.
<b>FDT</b> button. Use the top left drop down menu to select <b>Eddy current correction</b>.
<p><b>Diffusion Weighted data:</b> Use the browse button to select your 4D
analyze format series of diffusion weighted data.
<p><b>Diffusion weighted data:</b> Use the browse button to select
your diffusion weighted dataset (a 4D image).
<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
<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;
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The main FDT programmes, which are accesible from the GUI are:
<ul><li><a href="fdt_eddy.html">eddycorrect</a> - for correction of eddy current distortion</li>
<li><a href="fdt_bedpost.html">Bedpost</a> - for local modelling of diffusion parameters.</li>
<li><a href="fdt_probtrack.html">ProbTrack</a> - for tractography and connectivity-based segmentation</li>
<li><a href="fdt_dtifit.html">DtiFit</a> - for local of fitting of diffusion tensors</li></ul>
<li><a href="fdt_bedpost.html">bedpost</a> - for local modelling of diffusion parameters.</li>
<li><a href="fdt_probtrack.html">probtrack</a> - for tractography and connectivity-based segmentation</li>
<li><a href="fdt_dtifit.html">dtifit</a> - for local of fitting of diffusion tensors</li></ul>
<br>The FDT GUI also includes a <a href="fdt_reg.html">registration</a> option that registers images using <a
href="http://www.fmrib.ox.ac.uk/fsl/flirt/index.html" target="_top"> FLIRT </a>
<br>The FDT GUI also includes a <a
href="fdt_reg.html">registration</a> option that registers images
using <a href="../flirt/index.html" target="_top">FLIRT</a>.
<p>Additional FDT programmes, that can be run only from the command line, are:
<ul><li><a href="fdt_thresh.html">proj_thresh</a> - for thresholding some outputs
of ProbTrack</li>
of probtrack</li>
<li><A href="fdt_biggest.html">find_the_biggest</a> - for performing hard
segmentation on the outputs of connectivity-based thersholding in ProbTrack</li></ul>
segmentation on the outputs of connectivity-based thresholding in probtrack</li></ul>
<p>The probabilistic tractography tools within FDT are very flexible and allow
the user to generate connectivity distributions from single or multiple
voxels; to limit these distribution based on anatomical criteria and to
voxels; to limit these distributions based on anatomical criteria and to
perform segmentation based on the probability of connection to user-defined
target regions.
<p>To call the FDT GUI, either run <b>Fdt</b>, or run <b>fsl</b> and press the <b>FDT</b> button.
<p>To call the FDT GUI, either run <b>Fdt</b> (<b>Fdt_gui</b> on Mac
or Windows), or run <b>fsl</b> and press the <b>FDT</b> button.
<p>For an overview of the local diffusion modelling and tractography used
within FDT see the <a href="http://www.fmrib.ox.ac.uk/analysis/techrep/tr03tb1/tr03tb1/">appendix</a>
within FDT see the <a href="http://www.fmrib.ox.ac.uk/analysis/techrep/tr03tb1/tr03tb1/">appendix</a>.
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<p>To call the FDT GUI, either run <b>Fdt</b>, or run <b>fsl</b> and press the <b>FDT</b> button.
<p>A typical processing pipeline (and approximate time required for each
stage, based on an Intel 2.4GHz processor, and a 60 direction whole brain
dataset of dimensions, at 2.5 mm isotropic resolution )
stage, based on an Intel 2.4GHz processor, and a 60-direction whole brain
dataset of dimensions 128x128x64, at 2.5 mm isotropic resolution)
would consist of:
<ol>
<li>Any study or scanner-specific pre-processing (e.g., averaging of multiple
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......@@ -356,7 +356,7 @@ proc fdt:dialog { w tclstartupfile } {
$w.tool.menu add command eddy_current -label "Eddy current correction"
$w.tool.menu add command bedpost -label "BEDPOST Estimation of diffusion parameters"
$w.tool.menu add command registration -label "Registration"
$w.tool.menu add command probtrack -label "ProbTrack Probabalistic tracking"
$w.tool.menu add command probtrack -label "ProbTrack Probabilistic tracking"
$w.tool.menu add separator xutilsx
$w.tool.menu add command dtifit -label "DTIFit Reconstruct diffusion tensors"
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