[Mrtrix-discussion] empty ROI

[Donald Tournier]

Hi Manuel,

Can you post the output of 'mrinfo roi_CC1.mif' ? Would be good to also
have some info as to how the image was generated. Hopefully that'll help to
narrow down the problem...

Cheers,
Donald

--
Dr J-Donald Tournier (PhD)

Senior Lecturer, Biomedical Engineering
Division of Imaging Sciences & Biomedical Engineering
King's College London

A: Department of Perinatal Imaging & Health, 1st Floor South Wing, St
Thomas' Hospital, London. SE1 7EH
T: +44 (0)20 7188 7118 ext 53613
W:
http://www.kcl.ac.uk/medicine/research/divisions/imaging/departments/biomedengineering

On 4 Jun 2014 17:01, "Manuel Blesa Cábez" <mblesac at gmail.com> wrote:

> Hi all,
>
> I have a strange problem, I'm sure is easy to solve but I'm stuck on this
> and I don't find the solution.
>
> I want to calculate the tracks for a ROI, and when I run it I obtain the
> following message:
>
> tckgen fod.mif tracks_CC1.tck -algorithm SD_STREAM -grad
> ag140128a_6_HARDI_WT_ref.b -seed_image roi_CC1.mif -mask mask.mif -number
> 1000
>
> tckgen [ERROR]: Cannot use image roi_CC1.mif as ROI - image is empty
>
> I opened the ROI and it looks ok, and is not "outside" of the fod map. I
> did the same, for another ROI and it works correctly. I don't know way this
> ROI has this problem, Somebody can help me? Maybe is due to the location of
> the ROI and the default parameters? Thanks in advance.
>
> Best regards,
>
> Manuel Blesa
>
>
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