Radial adaptive filter for metal artifact correction

Details Radial adaptive filter for metal artifact correction Radial adaptive filter for metal artifact correction

2011-08-02

2011-08-02

Patel, Kanji (Department: 2624)

Image analysis

Image enhancement or restoration

Artifact removal or suppression

C382S131000, C378S021000

Reexamination Certificate

active

07991243

ABSTRACT:
A diagnostic imaging system (10) corrects metal artifact streaks (38) emanating from a metal object (36) in a tomographic image (T). A first processor (40) reduces streaks (38) caused by mild artifacts by applying an adaptive filter (82). The filter (82) is perpendicularly oriented toward the center of the metal object (36). The weight of the filter (82) is a function of the local structure tensor and the vector pointing to the metal object (36). If it is determined that the strong artifacts are present in the image, a second processor (48) applies a sinogram completed image algorithm to correct for severe artifacts in the image. The sinogram completed image and adaptively filtered image are fused to a final corrected image. In the fusion process, highly corrupted tomographic regions are replaced by the result of the sinogram completed image and the remainder is replaced by the adaptively filtered image.

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