[Mrtrix-discussion] output file of "find_SH_peaks"

[Donald Tournier]

Hi Jeong,

I wonder the order of fiber directions saved in the output file of
> "find_SH_peaks".
>
> This is what I did:
>
> gendir 100 dir100.txt
>
> find_SH_peak CSD8.mif dir100.txt SH_peaks_CSD8.mif
>
>
>
> The output file consists of 9 different 3-D volumes.
>
> Which ones are for X, Y, Z to indicate the direction of the 1st fiber ?
>
> I am guessing the first three volumes indicates the X, Y, Z of the first
> vector, next three indicates those of the second vector, and so on.
>
> Is it correct?
>

Yes, this is correct. Also, the norm of each of these X,Y,Z vectors provides
the amplitude of the FOD along the corresponding peak direction.


> Also, I would like to know whether 100 directions are good enough to
> estimate the directions of three fibers.
>

Yes, that's more than enough. In my experience, 60 is already enough for
lmax 8.

Cheers,

Donald.




> _______________________________________________
> Mrtrix-discussion mailing list
> Mrtrix-discussion at www.nitrc.org
> http://www.nitrc.org/mailman/listinfo/mrtrix-discussion
>
>


-- 
Jacques-Donald Tournier (PhD)
Brain Research Institute, Melbourne, Australia
Tel: +61 (0)3 9496 4078
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.nitrc.org/pipermail/mrtrix-discussion/attachments/20110215/d9c22a29/attachment.html