Dear FreeSurfers,

I have a question regarding conversion from MNI152 coordinates to MNI305 coordinates. I want to take ROIs from a VBM study and use these exact same ROIs in my vertexwise analysis. So I need to translate the x, y, z coordinates from MNI152 space into MNI305 space. In previous posts, I found a matrix that converts from MNI305 coordinates to MNI152:

M = [ 0.9975 -0.0073 0.0176 -0.0429

0.0146 1.0009 -0.0024 1.5496

-0.0130 -0.0093 0.9971 1.1840

0 0 0 1.0000]

P305 = [MNI305x MNI305y MNI305z 1]';

P152 = M*P305

However, I want to do it the other way around. I tried to calculate the inverse matrix but haven't succeeded. Does anyone have (or know how to create) the matrix/formula I need?

It would be very helpful, thanks in advance.

Anita