On Wed, May 16, 2012 at 9:32 AM, Emily Coffey <[log in to unmask]> wrote:

Hi,

I am trying to find the midpoint of a rigid body registration between two consecutive scans. Thomas et al., 2009 have done this previously, and provide the description: "the halfway point was determined by taking the square root of the alignment transformation (rigid, 6 DOF)".

I tried using the -sqrt option in fslmaths but this appears to be designed to handle volume data rather than transformation matrices. I thought it might be doable manually using MatLab's matrix capability but the format does not seem to be appreciated by MatLab.

Ideas?

E.