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Dear FSL users

I have one functional run of an fMRI task that I have preprocessed with feat to generate the appropriate first level feat directory. I want to register the statistics in the feat directory to standard space with the featregapply command so I can convert the standard space cope images to zstats. First, when I run the featregapply command on the feat directory it creates the cope and varcope files for each of my contrasts but doesn't create the FE_dof files for some of the subjects. I understand that I require the FE_dof for each cope image to perform the ttoz command. The preprocessing for each subject is identical by the way.

Any idea why this is happening?

Second, on the subjects where it does create the FE _dof files, I receive an error when I attempt to run the ttoz.

Command performed:

ttoz -zout zstat1.nii.gz varcope1.nii.gz cope1.nii.gz FEtdof_t1.nii.gz

Error received:

Error: failed to open file zstat1.nii.gz

Image Exception : #22 :: ERROR: Could not open image zstat1

An exception has been thrown

ERROR: Could not open image zstat1Trace: save_basic_volume4D.

terminate called after throwing an instance of 'RBD_COMMON::BaseException'

Aborted.

Any idea why this is happening?

Many thanks,

Liam.