I first created a segment using Segment Editor when CT is the master volume. Then I want to create a same segment when I choose MRI image as the master volume. Is there a easy way to do that? (CT volume and MRI volume have different grid size) I also read the similar topic " How to copy segment between multi-Sequence MRI images" . The answer that you gave is “Add new segments, select the other MRI image as master volume, and segment structures using that volume.” That means I still need to re-segment the structure if I choose MRI image as new master volume. I want to have a same segment and export it into binary labelmap which has the same grid size as MRI volume.