[Mrtrix-discussion] Facial Nerve Tractography

[Matthieu Vanhoutte]

Dear experts,

As recommended by Ivan, I will try to include more details on my post.

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).

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.

Many thanks in advance for helping !

Best regards,

-------------------------------------
Matthieu Vanhoutte, MSc
Research Engineer - Department of Neuroradiology
Regional University Hospital, Lille, France

2015-03-24 11:06 GMT+01:00 Ivan Alvarez <ivan.alvarez.11 at ucl.ac.uk>:

>  Hi Matthieu,
>
> This mailing list has been largely superseded by a Google+ page here:
> https://plus.google.com/communities/111072048088633408015
>
> 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?
>
> Also, since you're writing here I'll guess you are using MRtrix2, rather
> than the newer version (https://github.com/jdtournier/mrtrix3), 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!
>
> Kind regards,
> Ivan Alvarez
>
> PhD Candidate
> Imaging and Biophysics Unit
> UCL Institute of Child Health
> 30 Guilford Street, London, WC1N 1EH
>
> On 24/03/2015 09:17, Matthieu Vanhoutte wrote:
>
>    Dear MRtrix's experts,
>
>  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 :
>
>  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
>
>  OR
>
>  2) I tried to compute tracts from one ROI including the visible facial
> nerve from T1 image
>
>  Could you propose me any other method I should try ?
>
>  Best regards,
>
>      -------------------------------------
> Matthieu Vanhoutte, MSc
>  Research Engineer - Department of Neuroradiology
> Regional University Hospital, Lille, France
>
>
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