Hi,

you need to include a bvals and a bvecs file in the same directory as the data. The files should be named exactly like that, without any extensions (e.g. bvals.txt).

By the way, the slice thickness in your dataset is huge. It is always preferable to have isotropic voxel dimensions. If acquistion time is an issue, I'd rather sacrifice the number of directions to keep voxels close to isotropic.

Cheers,
Stam



----- Original Message ----- From: "Caporlingua Federico" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 12, 2011 7:28 PM
Subject: [FSL] Bedpostx error

Dear all,

I'm having difficulties in starting bedpostx. Here's what I get by trying with bedpostx_datacheck:


[root@localhost FSL_data]# bedpostx_datacheck bedpostx
bedpostx/data
data_type      INT16
dim1           128
dim2           128
dim3           19
dim4           130
datatype       4
pixdim1        1.9531250000
pixdim2        1.9531250000
pixdim3        6.5000000000
pixdim4        1.0000000000
cal_max        0.0000
cal_min        0.0000
file_type      NIFTI-1+

bedpostx/nodif_brain_mask
data_type      INT16
dim1           128
dim2           128
dim3           19
dim4           1
datatype       4
pixdim1        1.9531250000
pixdim2        1.9531250000
pixdim3        6.5000000000
pixdim4        1.0000000000
cal_max        0.0000
cal_min        0.0000
file_type      NIFTI-1+

num lines in bedpostx/bvals
cat: bedpostx/bvals: No such file or directory
0
num words in bedpostx/bvals
cat: bedpostx/bvals: No such file or directory
0
num lines in bedpostx/bvecs
cat: bedpostx/bvecs: No such file or directory
0
num words in bedpostx/bvecs
cat: bedpostx/bvecs: No such file or directory
0
cat: bedpostx/bvals: No such file or directory
cat: bedpostx/bvals: No such file or directory
Runtime error (func=(main), adr=3): Divide by zero
cat: bedpostx/bvecs: No such file or directory
cat: bedpostx/bvecs: No such file or directory
Runtime error (func=(main), adr=3): Divide by zero
/usr/local/fsl/bin/bedpostx_datacheck: line 51: [: too many arguments
/usr/local/fsl/bin/bedpostx_datacheck: line 55: [: too many arguments
/usr/local/fsl/bin/bedpostx_datacheck: line 59: [: too many arguments
number of elements in bvals is not equal to number of vols in data
/usr/local/fsl/bin/bedpostx_datacheck: line 67: [: too many arguments



I would really appreciate any help I could get!  Thank you very much....