Engineering topics
Publications and source records attributed to Cosman, Pamela.
This report describes research on active problems in computed tomography (CT) scanning applications. The problems are metal artifact reduction in CT images for medical imaging and luggage screening, and methods to evaluate segmentation of CT images. The research forms the basis of a PhD dissertation topic at UCSD, and is sponsored by LLNL.
Metal artifact reduction methods in computed tomography replace the projection data passing through metals with an estimate of the true data. Inaccurate estimation leads to the generation of secondary artifacts. Data estimates can be improved by the use of prior knowledge of the projection data. In this paper, a method has been created to generate a prior image. The method uses computer vision techniques to segment regions of the initially reconstructed image and then discriminates between regions that are likely to be artifacts and anatomical structures. Results on test images show that metal artifacts are reduced and that few secondary artifacts are present, even in the case of multiple metal objects.