[Mrtrix-discussion] output file of "find_SH_peaks"

[Kerstin Pannek]

Hi

is it possible to get the peaks at a higher resolution than the input csd?

Cheers
Kerstin



On 15/02/2011, at 9:42 AM, Donald Tournier wrote:

> 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.
> 
> 
>  
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> 
> 
> 
> -- 
> Jacques-Donald Tournier (PhD)
> Brain Research Institute, Melbourne, Australia
> Tel: +61 (0)3 9496 4078
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