A Redundant Ray Projection Completion Method for an Inverse Fan Beam Computed Tomography System

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Abstract
An actively synchronized heart gated computed tomography (CT) system was developed for a Technicare 2020 CT scanner. For even the most precise physical synchronization of the scanning apparatus, there will usually be a few gaps in the data for a particular time slice of the cardiac cycle. Of the several gap filling methods that were developed here, the most nearly ideal is the use of redundant ray measurements. For this type of scanner, there are no truly redundant rays, and normalization errors are particularly problematic. A practical algorithm was devised and tested here both on phantom data and on cardiac gated data (dog heart). The reconstructions obtained were usually artifact-free and showed no loss of resolution, even when up to 1/3 of the projection data were replaced by redundant ray measurements.

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