[Mrtrix-discussion] iFOD1, iFOD2 and SD_PROB

[Donald Tournier]

Hi Manuel,

Yes, iFOD1 is almost identical to streamtrack's SD_PROB. I'm surprised
you're getting unrealistic results with either iFOD1 or iFOD2 though, they
have both been working well for years now with default parameters. Are you
sure you don't have similar issues using the same data set with
streamtrack? There is the slight issue that the FODs would need to be
either converted using sh_basis or computed separately for each command due
to the change in SH basis, but I wouldn't expect even that to cause grossly
unrealistic results. Do the FODs obtained using dwi2fod look convincing
when displayed in MRView's ODF display tool? Maybe it would help of you
posted the commands you used to generate the FOD images and for the
tracking, and also provide some information as to the data acquisition
parameters?

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 3 Jun 2014 17:20, "Manuel Blesa Cábez" <mblesac at gmail.com> wrote:

> Dear all,
>
> I have a little question about the different propagation algorithms:
>
> I Know the difference between iFOD and iFOD2, but I would like to know
> which is the difference between this last algorithms of MRtrix 3 and the
> SD_PROB of MRtrix 2. I believe that the iFOD1 is the same of SD_PROB, I'm
> right about this?
>
> In order to perform a realistic tractography, which should I use? because
> I tried iFOD1 and iFOD2 and I obtained very unrealistic results, maybe is
> for the parameters that I choosed, but I'm not sure. Thanks in advance.
>
> Best regards,
>
> Manuel Blesa
>
>
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