Generation of reconstructed images

Image analysis – Applications – Biomedical applications

Reexamination Certificate

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C382S280000, C128S922000, C378S004000, C708S403000, C702S077000

Reexamination Certificate

active

10813807

ABSTRACT:
A method and system are presented for fast generation of one or more 2D DRRs of an object. 3D scan data of the object (such as CT scan data) are generated. A 3D fast Fourier transform F(u,v,w) is computed for a 3D scan volume f(x,y,z) within the 3D scan data, the scan volume f(x,y,z) having an orientation (θ, φ, φ). The 3D Fourier transform data are resampled along a surface S(θ, φ, φ, u′, v′) at angles θ, φ, φ corresponding to the orientation of the scan volume. The surface S is a plane for parallel beam geometry. For cone-beam geometry, it is the surface of a sphere whose center is coincident with the imaginary origin of the X-rays for the projection. The 2D inverse Fourier transform F−1[S(θ, φ, φ, u′, v′)] of the surface is computed, thereby generating a 2D DRR reconstructed along a projection direction perpendicular to the sample surface.

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