METHOD FOR REMOVING METAL ARTIFACT OF X-RAY CT IMAGE USING COMPRESSED SENSING THEORY

摘要

PURPOSE: A method for eliminating metallic shadow of an X-ray computation tomographical image is provided to accurately restore a projection image by eliminating artificial shadow which is cut with a metal part. CONSTITUTION: A projection image generating process(S110), a background region restoring process(S120), a metallic insert region restoring process(S130), and a final image acquiring process(140) are prepared. The background region restoring process restores the background region of a projection image excluding a metallic insert region by using a linear interpolation. The metallic insert region restoring process repeatedly restores the metallic insert region by using a compressive sensing theory. The final image acquiring process obtains a final image by adding restored images.