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19 March 2013Image reconstruction of arc cone-beam CT with reprojection: a preliminary study
A reprojection reconstruction is proposed for limited angle cone-beam CT. This approach can be used as an
improved method for any non-reprojection method such as total vibration (TV) minimization based and/or
projection onto convex sets (POCS) methods in cone-beam CT reconstruction. Since the reprojection and
backprojection are mutually inversed operations, the reprojection as line integral can be implemented with
backprojector currently used in most CT systems. In this study, we focused on the effect of reprojection
reconstruction with a small arc cone-beam CT scan. A human head phantom and a fiber glass plate were
used for the study with 15 projections spanning 45° of the scan. The results showed that the ringing artifacts
and edge unsharpness are greatly improved by the reprojection reconstruction method. We also found that an
arc scan covering larger projection areas of the object would result in a much greater reconstruction result
than a scan covering smaller projection areas with and without reprojection reconstruction method.
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Shih-Chung B. Lo, Matthew T. Freedman, "Image reconstruction of arc cone-beam CT with reprojection: a preliminary study," Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 866831 (19 March 2013); https://doi.org/10.1117/12.2008156