AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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Daniel Glen
October 02, 2020 10:37PM
Those numbers aren't exactly the "resolution"; they describe the grid size. It looks like you have more slices in the z-direction for one subject's dataset than the others, but the voxel size may be the same. Using a command like

3dinfo -d3 mydset.nii.gz

will give you the dimensions of a voxel. If you are using afni_proc.py and transforming your data to a standard space like MNI or TLRC, the template dataset will define your grid space, and you can use the option "-volreg_warp_dxyz" to define the voxel size of the output. If your datasets have the same voxel size to start, the same dxyz voxel size will be set for the output even without the option. See the help for afni_proc.py for more help on this.
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voxel resolution

nstuart October 01, 2020 11:54AM

Re: voxel resolution

Daniel Glen October 02, 2020 10:37PM