Contouring the outer surface of a CT image

Slicer version: 4.10.1
Hi 3D Slicer Experts and all
I have a CT image and I only want to contour its outside surface (like Figure A). I used Draw and Paint in the Segment Editor module. But it includes the inside area, too (Figure B). Also, when I use the Eraser, the outer line isn’t uniform. Is it possible not to do this contouring manually? and can I obtain this outer line?
Thanks a lot

p1

You can use SurfaceWrapSolidify extension to fill internal cavities in a segment.

I use the hollow effect to get what you describing and it gives very good results.You can use the hollow effect first to get the inner or outer surfaces and as Prof Lasso said then use the warpsolodify to fill inside if you want again.

Hi
Thank you very much for your helpful reply. now I have another question. I want to shift the red contour d cm to the Anterior( like the figure) . How can I do this?
If the value of d in each slice be different (di), can I shift the red contour in each slice separately di cm?
Thanks a lot

What do you mean by “shifting” the contour? What would you like to achieve?

What is the clinical application? (maybe we can point to readily available solutions)