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Dear FSL experts, 

when I try to perform a brain segmentation, bet fails. However, bet seems to work well for other T1 volumes. Any idea what the problem can be?

cheers,
Anders


bet ANAT.nii ANAT_brain.nii -R -B -v
IN=ANAT
OUT=ANAT_brain
bet2opts= -v
verbose=1
debug=0
variation=7
Image Exception : #22 :: ERROR: Could not open image ANAT_brain_tmp_premask_bias
terminate called after throwing an instance of 'RBD_COMMON::BaseException'
/home/andek/fsl/bin/bet: line 391: 21484 Aborted                 (core dumped) ${FSLDIR}/bin/fslmaths $IN -div ${OUT}_tmp_premask_bias ${OUT}_tmp_unbiased
Image Exception : #22 :: ERROR: Could not open image ANAT_brain_tmp_unbiased
terminate called after throwing an instance of 'RBD_COMMON::BaseException'
/home/andek/fsl/bin/bet: line 391: 21486 Aborted                 (core dumped) ${FSLDIR}/bin/bet2 ${OUT}_tmp_unbiased ${OUT}_tmp_unbiased_forskull $bet2opts
Input image ANAT_brain_tmp_unbiased not valid

Error: input image ANAT_brain_tmp_unbiased_premask not valid