To visualise the mark-ups in 3D, install a Tv using this button, to produce a threed Tv.
Click on Draw Spline and then Mousemouse in the SequenceTv. Use the left mouse button to position the points of the spline, and the middle button to create the spline.
Click on Edit Spline and then Mousemouse (if not already selected) in the sequence Tv. To move a point on the spline, click with the left button on the spline point and drag to required position. To insert a point, click with middle button; to delete a point, click on the point with the right button. Note that because of the spline representation, there must be three remaining points in the spline.
Click on Remove Spline to remove the spline in the given VOI for that slice.
If any Tv panel has a polygonal region of interest marked out, clicking on this button results in the poly_roi being converted to a spline and represented on the sequence Tv and threed Tv.
Use this button to convert a spline to a poly_roi and display in the imcalc Tv. I think you need to have an image in the imcalc first.