| 摘要 |
A method and system for soft tissue image reconstruction for dual x-ray imaging is disclosed. A multigrid PDE solver is used for solving a Poisson equation for soft tissue image reconstruction based on a soft tissue gradient field extracted from dual energy x-ray images. The divergence of the soft tissue gradient field is downsampled to a coarsest resolution level, and a soft tissue image is generated based on the divergence of the soft tissue gradient field at the coarsest level. The soft tissue image is interpolated to a next finest resolution level, and refined by at least one coarse grid correction cycle at the current resolution level. The coarse grid correction cycle calculates a defect based on the current soft tissue image, downsamples the defect to the coarsest level, calculates a correction based on the defect at the coarsest level, and upsamples the correction to the current resolution level to refine the current soft tissue image. The interpolation and refinement of the soft tissue image is repeated until the soft tissue image is refined at the finest resolution level.
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