<div dir="ltr"><div><div><div><div><div>Dear experts,<br><br></div>As recommended by Ivan, I will try to include more details on my post. <br><br></div>I am using MRtrix2 et trying to tract facial nerve (VII) from the internal auditory meatus to brainstem. I am using CSD tracking ans SD_PROB as method. My seed ROI have been defined on the T1 anatomical then register on DTI image (32 directions images, b0 = 1000, resolution = 2x2x2).<br><br></div>As you can see in the joined files, facial nerve on the left hemisphere is visible on T1 anatomical (show focus) however my tracking results show a hole (show focus) in the facial nerve tract.<br><br></div>Many thanks in advance for helping !<br><br></div>Best regards, <br></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div style="font-family:arial;font-size:small">-------------------------------------<br>Matthieu Vanhoutte, MSc<br></div><div style="font-family:arial;font-size:small">Research Engineer - Department of Neuroradiology </div><div style="font-family:arial;font-size:small">Regional University Hospital, Lille, France<br></div></div></div></div>
<br><div class="gmail_quote">2015-03-24 11:06 GMT+01:00 Ivan Alvarez <span dir="ltr"><<a href="mailto:ivan.alvarez.11@ucl.ac.uk" target="_blank">ivan.alvarez.11@ucl.ac.uk</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Hi Matthieu,<br>
<br>
This mailing list has been largely superseded by a Google+ page
here: <a href="https://plus.google.com/communities/111072048088633408015" target="_blank">https://plus.google.com/communities/111072048088633408015</a><br>
<br>
Also, if you would like some advice from the community I would
recommend including the following details in your post: 1) what
exact structure are you attempting to track? A particular branch of
the facial nerve, or the whole thing? 2) what method are you using?
(tracking algorithm, seed/waypoint ROIs, location), 3) what dMRI
acquisition are you using? (resolution, b values, etc.) and most
importantly, 4) what makes you say the results are not convincing?
in other words, what's going wrong?<br>
<br>
Also, since you're writing here I'll guess you are using MRtrix2,
rather than the newer version
(<a href="https://github.com/jdtournier/mrtrix3" target="_blank">https://github.com/jdtournier/mrtrix3</a>), so it's worth pointing that
out too. Some extra detail would make it easier for the experts to
point you in the right direction. Good luck!<br>
<pre cols="72">Kind regards,
Ivan Alvarez
PhD Candidate
Imaging and Biophysics Unit
UCL Institute of Child Health
30 Guilford Street, London, WC1N 1EH</pre><div><div class="h5">
<div>On 24/03/2015 09:17, Matthieu Vanhoutte
wrote:<br>
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<div>Dear MRtrix's experts,<br>
<br>
</div>
I am trying to compute tracts of the facial nerve
(nerve VII). In order to succeed in this, I have tried
different methods but the results aren't still
convincing :<br>
<br>
</div>
1) I tried to compute tracts from one coordinate seed
with radius of 3 mm at the entry area of the facial
nerve at the brain-stem<br>
<br>
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OR<br>
<br>
</div>
2) I tried to compute tracts from one ROI including the
visible facial nerve from T1 image<br>
<br>
</div>
Could you propose me any other method I should try ?<br>
<br>
</div>
Best regards,<br>
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<div style="font-family:arial;font-size:small">-------------------------------------<br>
Matthieu Vanhoutte, MSc<br>
</div>
<div style="font-family:arial;font-size:small">Research
Engineer - Department of Neuroradiology </div>
<div style="font-family:arial;font-size:small">Regional
University Hospital, Lille, France<br>
</div>
</div>
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</blockquote>
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