[Mrtrix-discussion] eddy correction and ideal number of streamlines for TDI

[Fernando Calamante]

Hi there,
Following on Rob's email, if you don't have the merge_tracks program, you
can calculate the separate TDI files (e.g. from a 3M and 2M tck files), and
then just add the TDI files to generate the TDI of 5M tracks (provided you
used "count" and not "fraction", given that the TDI counts the number of
tracks, so adding TDIs from separate tck files, just add the counts).
In that way, you can keep on generating a few extra million at a time,
until you are happy with the achieved CNR (i.e. you can do this to "fine
tune" your TDI protocol).
The only practical issue is that you should use the -template option, so
all the TDIs have the same FOV (if you use the -vox option only, then each
would have its own specific FOV, and mradd will complain).
Cheers,
Fernando

----------------------------------------

On Sat, Dec 15, 2012 at 4:46 PM, Robert Smith <r.smith at brain.org.au> wrote:

> Todd
>
> I just successfully compiled this program in MRtrix version 0.2.10. This,
> combined with the location of the error you're getting, suggests that your
> system is either missing the necessary header files to compile this program
> (not likely), or the required header files are not being found in the
> compilation process (more likely).
>
> In file cmd/merge_tracks.cpp, try adding the following line near the top
> of the file (around line 27):
> #include <unistd.h>
> The merge_tracks program uses code libraries that come with Linux to
> navigate and interrogate the HDD directory structure; addition of this line
> should hopefully inform the compiler where to find the relevant libraries.
> If this still doesn't fix the problem please let me know, as I can't
> reproduce the error at my end.
>
> Best regards
> Rob
>
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>
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