help > Can the coordinate table resolution be based on the overlay map?
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Sep 11, 2023  07:09 PM | Jeremy Purcell - Johns Hopkins University
Can the coordinate table resolution be based on the overlay map?

Hello,


I notice when generating cluster table outputs, the voxel coordinates are in the underlay space. Is it possible for them to be in the overlay space? E.g., if I have an overlay in 1x1x1mm resolution but use the default MNI152 brain in ~.7x.7x.7mm resolution I get standard coordinates in sub mm increments. It would be a bit more convenient if the resolution of these coordinates were based on the overlay maps. My current work around is to simply use an underlay that is the functional or lesion map, and then generate the cluster tables, but it would be easier if one did not need to do this. 


Thanks!


Jeremy

Sep 12, 2023  01:09 PM | Chris Rorden
RE: Can the coordinate table resolution be based on the overlay map?

The background image provides the spatial coordinates for the table. You can load the same image for the background and overlay to get identical dimensions. 


 


Alternatively, you may want to reslice your template image to use the same resolution as the target image. Here is my SPM script for this purpose:


  https://github.com/rordenlab/spmScripts/...


In general, you need to be cautious about reslicing thresholded images to different resolutions, as I discuss here:


 


 


https://www.nitrc.org/plugins/mwiki/index.php/mricrogl:MainPage#Cluster_Thresholds