[Mrtrix-discussion] RE: SD_PROB tractography with DWI input

[Ashmore, Jonathan]

Thanks Ben,
I thought that might have been the case but wanted to ask given it did provide an output (albeit non-sensical).
Jonathan

MRI Physicist
Kings College Hospital
Ruskin Wing
Denmark Hill
London SE5 9RS
Ph (KCH): 020 3299 9000 (x4898)
Ph (CNS): 020 3228 3081
fax (CNS): 020 3228 2116
________________________________________
From: mrtrix-discussion-bounces at www.nitrc.org [mrtrix-discussion-bounces at www.nitrc.org] On Behalf Of Jeurissen Ben [Ben.Jeurissen at ua.ac.be]
Sent: 04 July 2011 09:36
To: mrtrix-discussion
Subject: [Mrtrix-discussion] RE: SD_PROB tractography with DWI input

In a follow-up to that question:

Running SD_PROB on a DWI dataset will interpret the first (Lmax+1)*(Lmax+2)/2 DWIs as FOD SH coefficients. This will indeed produce nonsense tracts.

ALL SD_* tractography algorithms require SH coefficients of the FOD as input.

Cheers,
Ben


-----Original Message-----
From: Jeurissen Ben
Sent: maandag 4 juli 2011 10:30
To: mrtrix-discussion
Subject: RE: SD_PROB tractography with DWI input

Hi Jonathan,

Probabilistic tractography with DTI is not implemented in MRtrix.

>From the manual or the help function: "Allowed types are DT_STREAM, SD_STREAM, SD_PROB."

DT_STREAM is deterministic streamline tractography with the DT model
SD_STREAM is deterministic streamline tractography with FODs
SD_PROB is probabilistic streamline tractography with FODS

Cheers,
Ben

-----Original Message-----
From: mrtrix-discussion-bounces at public.nitrc.org [mailto:mrtrix-discussion-bounces at public.nitrc.org] On Behalf Of Ashmore, Jonathan
Sent: maandag 4 juli 2011 10:22
To: mrtrix-discussion
Subject: [Mrtrix-discussion] SD_PROB tractography with DWI input

Hi all,
hopefully this a quick and easy question. Does MRtrix allow you to run probabilistic tractography with the diffusion tensor reconstruction. Or does probabilistic tractography only run with CSD reconstructed data? If I run streamtrack using SD_PROB with DWI data as the input it outputs a tck file but the tracks seem to be slightly gibberish
All the best
Jonathan


MRI Physicist
Kings College Hospital
Ruskin Wing
Denmark Hill
London SE5 9RS
Ph (KCH): 020 3299 9000 (x4898)
Ph (CNS): 020 3228 3081
fax (CNS): 020 3228 2116_______________________________________________
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