Reducing metal artifacts by pre-processing projection data in dental CBCT with a half-size detector

In dental Cone-Beam CT reconstruction images, the metallic implants will cause apparent streak artifacts, which may seriously increase the difficulty of diagnosis. Here we present a new metal artifacts reducing method designed for our dental CBCT with a half-size detector. In our method, we first locate the positions of all the metallic implants in the three-dimensional space, and then the projection points of the metal positions will greatly simplify the segmentation and modification of the metal area in each projection image. This method is proved to be efficient and accurate by experimental results.