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Hi Donald,<br>
<br>
I wanted to bring up motion correction again, particularly what is
recommended for and against in MRtrix. I am aware the issue has been
raised in the mailing list before, but it might be useful to have an
idea of what is generally a good or bad idea.<br>
<br>
So far, I have seen people doing motion/eddy-current correction in
either ExploreDTI or FSL. The documentation for both is these is
somewhat scant and I am trying to piece together what do they
exactly do. This is my naive reading so far, please feel free to
correct me:<br>
<br>
ExploreDTI<br>
* Affine registration<br>
* Whole volume at a time<br>
* Updates B-matrix<br>
<br>
FSL<br>
* Affine registration<br>
* Slice-by-slice<br>
* Does<i> not</i> update B-matrix<br>
<br>
From what I understand in the discussion, the slice-by-slice
registration is preferable to avoid smearing artefacts across the
whole volume while updating the B-matrix can generally improve
results (<a class="moz-txt-link-freetext" href="http://www.ncbi.nlm.nih.gov/pubmed/19319973">http://www.ncbi.nlm.nih.gov/pubmed/19319973</a>). Is this
roughly correct? If so, are there any other considerations specific
to MRtrix?<br>
<pre class="moz-signature" cols="72">--
Kind regards,
Ivan Alvarez
PhD Candidate
Imaging and Biophysics Unit
UCL Institute of Child Health
30 Guilford Street, London, WC1N 1EH </pre>
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