Respiratory displacement modelling in cone beam computed tomography

Journal Article

Any organ motion during the projection acquisition causes blurring artefacts in the Computed Tomography (CT) reconstructions. It is a drawback in applications of Cone Beam CT (CBCT) for which, the complete scanning cannot be performed during a single breath hold. Our study proposes a new approach for estimation of the organ's respiratory displacement, from the same projection data, required for the CBCT with sampling over a circular trajectory. The processing includes semiautomatic outlining of the organ's boundaries on the X-ray projections, creating approximate shadow images, and constructing, from them, of a convex 3D organ-like structure, with the property to perform the same respiratory displacement as the one of the organ of interest. The motion is derived as a function of the respiration and can be used for respiratory motion correction in the following CBCT algorithm. Simulation results reveal significant improvements of the image quality in a cardiac tomogram reconstruction.

Full Text

Duke Authors

Cited Authors

  • Buliev, IG; Badea, CT; Pallikarakis, N

Published Date

  • January 1, 2003

Published In

Volume / Issue

  • 30 /

Start / End Page

  • 617 - 620

International Standard Serial Number (ISSN)

  • 0276-6574

Digital Object Identifier (DOI)

  • 10.1109/cic.2003.1291231

Citation Source

  • Scopus