Dear all,<div><br></div><div>For a longitudinal analysis I need to have within subject templates. After some preprocessing that included FSL&#39;s BET, and linear registration of all time points to time-point 1, I fed images to mri_robust_template:</div>
<div><br></div><div>mri_robust_template --mov tp1 tp2 tp3 --template &lt;template_address&gt; --satit</div><div><br></div><div>It runs fine for some subjects, however I get the following error for some others:</div><div><div>
<br></div><div>ERROR: All entries are zero! Images do not overlap (anymore?).</div><div>    This can have several reasons (i.e. different modalities, different </div><div>    intensity scales, large non-linearities, too diff. voxel sizes ...)</div>
<div>    Maybe use --transform &lt;init.lta&gt; with an approx. alignment</div><div>    obtained from tkregister or another registration program.</div><div>    Or do some prior intensity correction?</div></div><div><br></div>
<div>I have rechecked data, they are bias corrected, and coregistered. </div><div><br></div><div>Any thoughts of what could possibly go wrong here?</div><div><br></div><div>All the best,</div><div>Arman</div>