I&#39;m trying to draw an ROI by selecting the center of activation for a particular contrast and then selecting nearby voxels within a certain range (for example. say 20 voxels).  Ideally I&#39;d like to select only the voxels within this range that are activated by my contrast.  However, I can&#39;t see how to do this, any help would be appreciated.<div>

<br></div><div>Thanks,</div><div><br>Katie</div>