Dear list,

I'm working on intracranial electrode localization and am developing a pipeline to map electrode coordinates in the native RAS space to brain templates like fsaverage/MNI305 and MNI152. I would like to check whether my workflow is correct and would appreciate any input on the validity! The steps are described below:

1. Obtain electrode coordinates (in mm) on the native orig.mgz as an array [R A S]
2. Read the 4x3 matrix (tal_mat) in mri/transforms/talairach.xfm. Obtain the new coordinates in MNI305 = tal_mat * [R A S 1]'
3. Use the MNI305 to MNI152 matrix (305_152_mat) mentioned in MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be https://surfer.nmr.mgh.harvard.edu/fswiki/CoordinateSystems (8^th Use case). Obtain the new coordinates in MNI152 = 305_152_mat * [R_305 A_305 S_305 1]'. Where R/A/S_305 is the output from step 2.
   

Thank you very much in advance!