Auto-contouring algorithms

[Ted Hill]

Hello,
 
Is anyone aware of a source that discusses algorithms for "automated
contour location."
 
This is related to medical imaging: for example
 
1. On a 2D image (e.g. a digital x-ray image) draw a contour line that
separates bone from less dense tissue.
 
2. In a 3D image (e.g. a CAT-scan) find the surface that encloses bone
and separates it from less dense tissue.
 
I am assume that there are some published algorithms and am interested
in how then compare vis-a-vis order of complexity.
 
Thank you,
 
Ted Hill
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