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  • Title: A local region of interest image reconstruction via filtered backprojection for fan-beam differential phase-contrast computed tomography.
    Author: Qi Z, Chen GH.
    Journal: Phys Med Biol; 2007 Sep 21; 52(18):N417-23. PubMed ID: 17804875.
    Abstract:
    Recently, x-ray differential phase contrast computed tomography (DPC-CT) has been experimentally implemented using a conventional source combined with several gratings. Images were reconstructed using a parallel-beam reconstruction formula. However, parallel-beam reconstruction formulae are not directly applicable for a large image object where the parallel-beam approximation fails. In this note, we present a new image reconstruction formula for fan-beam DPC-CT. There are two major features in this algorithm: (1) it enables the reconstruction of a local region of interest (ROI) using data acquired from an angular interval shorter than 180 degrees + fan angle and (2) it still preserves the filtered backprojection structure. Numerical simulations have been conducted to validate the image reconstruction algorithm.
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