Hi at all,
I'm conducting a fMRI study on 6 kids who underwent monolateral brain ischemic lesion.
I'm particularly interested in the primary motor cortex and supplementary motor cortex, so i thought about using a mask for those regions.
I tried to draw a mask in fslview based either on the standard atlas or based on tresh_zstat calculated at higher (unmasked) level analysis but there is one problem as I see in the log file:
WARNING:: Inconsistent orientations for individual images in pipeline!
Will use voxel-based orientation which is probably incorrect - *PLEASE CHECK*!
Image Exception : #3 :: Attempted to multiply images/ROIs of different sizes
terminate called after throwing an instance of 'RBD_COMMON::BaseException'
Aborted
So the results of the masked analysis is exactly the same of unmasked ones.
I already check in the archives, but the my situation seems slightly different.
The FEAT input images were processed and registered to MNI 2mm brain template.
The mask i draw has this values:
nico@nico-EX58-UD5:~/Desktop/Mask$ fslinfo test.nii.gz
data_type INT16
dim1 91
dim2 109
dim3 91
dim4 1
datatype 4
pixdim1 2.0000000000
pixdim2 2.0000000000
pixdim3 2.0000000000
pixdim4 0.0000000000
cal_max 4.0000
cal_min 0.0000
file_type NIFTI-1+
While the tresh_zstat are:
nico@nico-EX58-UD5:~/Desktop/Mask$ fslinfo thresh_zstat4.nii.gz
data_type FLOAT32
dim1 91
dim2 109
dim3 91
dim4 1
datatype 16
pixdim1 2.0000000000
pixdim2 2.0000000000
pixdim3 2.0000000000
pixdim4 1.0000000000
cal_max 0.0000
cal_min 0.0000
file_type NIFTI-1+
Instead, the filtered_func_data.nii.gz out FEAT prestats has those values:
nico@nico-EX58-UD5:~/Desktop/Mask$ fslinfo z.nii.gz
data_type FLOAT32
dim1 64
dim2 64
dim3 36
dim4 100
datatype 16
pixdim1 3.5156250000
pixdim2 3.5156250000
pixdim3 3.7499618530
pixdim4 3.5000009537
cal_max 0.0000
cal_min 0.0000
file_type NIFTI-1+
The question is... this error occur because I create I mask on standard 2mm space instead on the (different in dimension) filtered_func_data, or there are other problems?
Thanks a lot.
P.s.: my fsl version is 4.1.8 on Ubuntu system.
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