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SPM for programmers » Convert matrix coordinates to image coordinates and vice versa
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Tips Martin Pyka on 31 May 2010 04:14 pm

Convert matrix coordinates to image coordinates and vice versa

To convert matrix coordinates for a given Nifti/Analyze-image into the image coordinates and vice versa, you need to load the transformation matrix of the image into the workspace:

vol = spm_vol('image.img')
vol.mat % displays the transformation matrix

% trasform from matrix/voxel coordinates to image coordinates (the fourth element has to be 1)
vol.mat * [x y z 1]‘
% transform image coordinates (e.g. mni space) to matrix coordinates
inv(vol.mat) * [x y z 1]‘

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