Image analysis – Applications – Biomedical applications
Reexamination Certificate
2008-01-01
2008-01-01
Ahmed, Samir (Department: 2624)
Image analysis
Applications
Biomedical applications
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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Accuray, Inc.
Ahmed Samir
Bhatnagar Anand
Blakely , Sokoloff, Taylor & Zafman LLP
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