Polychromatic Streak Artifacts in Computed Tomography Images

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Abstract
A series of artifacts in computed tomography (CT) images, consisting of streaks coming off edges and flares surrounding the object, being scanned, apparently is due to polychromaticity of the X-ray beam. These artifacts are seldom seen on conventional CT [human] brain scans. They are helpful in understanding artifacts such as those seen around the petrous bone of the skull. Following this, a comparison is made between single energy and dual energy correction schemes for poly-artifacts. The theoretical assumptions underlying either method are analyzed and the importance of these concepts in dual energy reconstructions is stressed. A new test phantom is suggested to evaluate different poly-correction schemes. All simulated projection data in this study are noise free and are reconstructed using an industrial convolution-back projection technique. Reconstructions are shown of the phanton using real data taken with and without a water bag path length compensator.

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