[Camino-users] qball reconstruction

[Alexander, Daniel]

Maybe spherical harmonic q-ball is not sensitive enough on your data to pick out multiple directions.  You could try using sfplot to generate a picture of the full ODFs to check whether they appear to have multiple peaks that sfpeaks is missing for some reason.

Danny


On 10 Sep 2012, at 12:56, Peter Neher wrote:

> Hi everybody. I am trying to reconstruct my data using fourth order spherical harmonics, but it looks like there is always only one direction per voxel reconstructed. You can find the commands  I used below.
> 
> qballmx -schemefile camino1.scheme -basistype sh -order 4 > mx.Bdouble 
> linrecon dwi1.Bfloat camino1.scheme mx.Bdouble -normalize -bgmask "mymask.nii" > sh.Bdouble 
> sfpeaks -inputmodel sh -order 4 -pdthresh 0.0 -numpds 3 -density 1000 -searchradius 1.0 < sh.Bdouble > myPds.Bdouble"
> 
> I also tried to run sfpeaks without "-pdthresh 0.0 -numpds 3" but that does not change anything. An image of the result is attached. The PAS reconstruction seems to work fine.
> Any suggestions?
> 
> Best,
> Peter
> <pds.png>_______________________________________________
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