Hi,
your data file is not correct: You need to input a 4D-file, yours is only 3D. Furthermore, its 3rd dimension should equal your number of slices, i.e. 20 and not 260.
So if you fix your data conversion you may be fine.
Cheers-
Andreas
-----Ursprüngliche Nachricht-----
Von: FSL - FMRIB's Software Library im Auftrag von Jenifer Juranek
Gesendet: Do 15.09.2005 00:41
An: [log in to unmask]
Betreff: [FSL] bedpost_datacheck ->mismatch error
Hi,
I'm experiencing "user error" with my attempts to use DTIFit to analyze
12MDDW data acquired on a 3T Siemens Trio. I have attempted to follow the
advice in the email archive re: bvals and bvecs, but have been unsuccessful
in generating files using DTIFit to Reconstruct diffusion tensors with my
data (attempts using posted data from the FSL course have been successful).
I get errors when I run bedpost_datacheck on my data, specifically "the
number of elements in bvals and bvecs are not equal to the number of vols in
data". I have 260 images total, 20 slices/direction, and I have 13
directions (b=0 x1; b=1000 x12). The bvecs were obtained from Siemens. The
output of bedpost_datacheck is appended below:
TIA for suggestions to correct "user error",
Jenifer
$more output.txt
./data
dim1 128
dim2 128
dim3 260
dim4 1
datatype 4
pixdim1 1.5625
pixdim2 1.5625
pixdim3 6.545
pixdim4 0.0000
cal_max 255.000
cal_min 0.000
glmax 255
glmin 0
origin1 0
origin2 0
origin3 0
file_type NIFTI-1+
./nodif
dim1 128
dim2 128
dim3 260
dim4 1
datatype 4
pixdim1 1.5625
pixdim2 1.5625
pixdim3 6.545
pixdim4 0.0000
cal_max 255.000
cal_min 0.000
glmax 255
glmin 0
origin1 0
origin2 0
origin3 0
file_type ANALYZE-7.5
./nodif_brain_mask
dim1 128
dim2 128
dim3 260
dim4 1
datatype 4
pixdim1 1.5625
pixdim2 1.5625
pixdim3 6.545
pixdim4 1.0000
cal_max 1.000
cal_min 0.000
file_type NIFTI-1+
num lines in ./bvals
1
num words in ./bvals
13
num lines in ./bvecs
3
num words in ./bvecs
39
number of elements in bvals is not equal to number of vols in data
number of elements per line in bvecs is not equal to number of vols in data
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