I suppose too，but I try to segment a piece of vertebra with thresholding and region growing, I get a whole vertebrae. The algorithm of Mimics software can get a piece of bone without connecting to the adjacent bones.So It's not just simple thresholding and region growing segmentation algorithm.What do you think?
I don't think Mimics can do this automatically, it rely heavily on the thresholding value you select, and the image data you provide.
Here you get a whole vertebrae instead of one piece because your thresholding range is too large and cannot make vertebrae pieces individual from each other.
But if you thresholding range is too small, you might lose some image detail.
So to my knowledge, there's two option:
Option A is to erase extra pixels slice by slice near the connection of vertebrae pieces to avoid misconnection.
Option B is to shrink your thresholding, but that might lose some image detail and make the generated model tough.
When I get a whole vertebrae, I use vtkCutter to cut extra vertebrae, But it is not very good. I think it is necessary to improve segmentation algorithm. So I should go to ITK forum,thank you all the same.