Is it possible to use margin tool only inside a ROI?

I am trying to shrink the margin of the segmentation by couple millimetres. However I want to do it only inside the specified annotation ROI. I tried setting the source geometry as the annotation ROI and then using the shrink tool. But it shrinks the whole segmentation.

Is it possible to shrink the segmentation just inside the ROI?

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You need to specify editable region using a segment and specify that segment in the masking options section in Segment Editor.

Do you mean I should create another segment for the portion I want to edit, select that segment as editable region in masking and then apply shrink? Is there anyway I can edit only inside the ROI and not anywhere else?

Yes. Make sure to allow overlap so that the mask segment can overlap with segments you want to modify.

That’s exactly how it works. Once you set a segment as editable region, you can only modify inside that region.

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