1. A method, performed by a computer having a memory and a processor, for segmenting an anatomical landmark in digital medical images, comprising: transforming at least one digital image of an anatomical landmark from an Image Domain to a Radon Domain to obtain an original sinogram, the transforming being based on a calculation as follows P s (α)=Rƒ(α,s)=∫ −∞ ∞ ∫ −∞ ∞ ƒ(x,y)δ(s−x cos α−y sin α)dxdy αε[0,π]sεR; decomposing the original sinogram to obtain a plurality of sinograms, each of the plurality of sinograms being at a different scale; combining the plurality of sinograms into a binary sinogram; and reconstructing the binary sinogram into a reconstructed sinogram.