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Hi,

the problem is exactly what the error messages describe. Your data and bvals/bvecs have different number of entries (72 vs 144). Have you done some averaging of the data (e.g. 2 repeats)? Then you should only keep hald of the bvals/bvecs entries.

Cheers
Stam



On 20 Mar 2013, at 12:38, SUBSCRIBE FSL L.Kalmbach wrote:

> Hello all.
> 
> I started preprocessing my data and I got the following error using DTIFIT:
> " Terminate called after throwing an instance of 'NEWMAT::IndexException'"
> Then I checked with bedpostx_datacheck my fsl_analysis directory:
> I got the following output: 
> 
> 
> fsl_analysis/data
> data_type      INT16
> dim1           96
> dim2           96
> dim3           63
> dim4           72
> datatype       4
> pixdim1        2.3958332539
> pixdim2        2.3958332539
> pixdim3        2.0000724792
> pixdim4        1.0000000000
> cal_max        0.0000
> cal_min        0.0000
> file_type      NIFTI-1+
> 
> fsl_analysis/nodif_brain_mask
> data_type      INT16
> dim1           96
> dim2           96
> dim3           63
> dim4           1
> datatype       4
> pixdim1        2.3958332539
> pixdim2        2.3958332539
> pixdim3        2.0000724792
> pixdim4        1.0000000000
> cal_max        0.0000
> cal_min        0.0000
> file_type      NIFTI-1+
> 
> num lines in fsl_analysis/bvals 
> 1
> num words in fsl_analysis/bvals 
> 144
> num lines in fsl_analysis/bvecs 
> 3
> num words in fsl_analysis/bvecs 
> 432
> number of elements in bvals is not equal to number of vols in data
> number of vectors in bvecs is not equal to number of vols in data
> 
> 
> 
> Okay, then I checked the bvecs and bvals but they have the same number of elements.... Do I have to normalize them to unisize and if how? or is there another problem?
> 
> I would be very thankful for your help :)
> 
> 
> Thanks and Cheers
> 
> Lys
>