Control Masks

Approach to generate dilated and shifted control masks
MRI
Author

MG

Published

16 Dec 2025

Modified

16 Dec 2025

In a previous project, we needed to provide evidence for the spacial specificity of the response captured in a (Claustrum) mask.

To achieve this, we defined control masks by dilating and shifting the original mask, to cover brain areas surrounding the relevant structure.

The corresponding script can be found here: /shared/ClaustrumLabels/control/create_shifted_and_dilated_masks.ipynb

After specifying location and name of a given mask, this notebook creates (per Hemisphere!):

  1. 6 shifted control masks: the original mask is shifted by one voxel in one of (currently) six directions. This process is repeated until the shifted mask isn´t overlapping with the original mask anymore

  2. 1 mask combining the 6 shifted control regions

  3. 1 dilated mask: the original mask is dilated by a given number of voxels. By subsequently subtracting the original mask, this dilated control contains only voxels surrounding the original structure

Finally, all newly computed masks are stored.

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