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Dear All,

I want to conduct fMRI FEAT analyses at the individual level with subject specific MRIs and manual segmentation masks. The masks were created in ITK-snap and INT16 type, not FLOAT32 as the other images are.


data_type      INT16

dim1           185

dim2           207

dim3           209

dim4           1

datatype       4

pixdim1        1.000000

pixdim2        1.000000

pixdim3        1.000000

pixdim4        0.000000

cal_max        0.0000

cal_min        0.0000

file_type      NIFTI-1+

Therefore, when I am running the feat, I get an error at post stats:


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
libc++abi.dylib: terminating with uncaught exception of type RBD_COMMON::BaseException

FATAL ERROR ENCOUNTERED:
COMMAND:
/usr/local/fsl/bin/fslmaths thresh_zstat1 -mas /Users/.../Desktop/SCANS/Masks/seg_mask.nii.gz thresh_zstat1
ERROR MESSAGE:
child killed: SIGABRT
END OF ERROR MESSAGE
child killed: SIGABRT
    while executing
"if { [ catch {

for { set argindex 1 } { $argindex < $argc } { incr argindex 1 } {
    switch -- [ lindex $argv $argindex ] {

        -I {
            incr arginde..."
    (file "/usr/local/fsl/bin/feat" line 310)
Error encountered while running in main feat script, halting.
child killed: SIGABRT


I am as sure that the images are labelled correctly, so assume the data type is the problem.


Does this sound correct? And if so, how do I safely convert the mask to the correct data type?


Many thanks in advance.


Clare