Patent ID: 7274766

Claim:
A method for producing three-dimensional information of an object in medical X-ray imaging, the method comprising the steps of: x-radiating the object from at least two different directions; detecting said x-radiation to form projection data of the object; utilizing said projection data in a regularized reconstruction method based on solving the non-linear evolution equation ∂ t φ( x,t )=− h ( x,t ) A *( A ( f (φ( x,t )))− m )+α P φ( x,t ) to produce three-dimensional information of the object, x representing the coordinates inside the object under imaging, t representing time, φ representing a level set function indicating the boundary of the object, h representing a positive-valued function, m representing projection data, the operator A representing the X-radiation attenuation model, A* representing the backprojection operator, α representing a positive number, P representing high pass filtering, and f representing a cut-off function returning zero for non-positive arguments and positive values for positive arguments; and producing three-dimensional information of the object.