In previous versions of FSL (5.0.6 and 4.1), we were using the -bptf flag in fslmaths to apply a high pass filter to our fMRI data. However, using the same command in FSL 5.0.7 (from NeuroDebian) yields unexpected output that is no longer looks brain-like. Has anyone else experienced this? Is there a reason for this change?
We have been using a command like fslmaths input.nii.gz -bptf 33 -1 filteredoutput.nii.gz on fMRI data with TR=2 seconds, but the output data look similar with a wide range of highpass sigma values (e.g., 2, 100). I can provide example data if that would be helpful.
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