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Proceedings Paper

Evaluation of a physical based approach of scattered radiation correction in cone beam CT with an anthropomorphic thorax phantom
Author(s): Jean Rinkel; Laurent Gerfault; François Estève; Jean-Marc Dinten
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Paper Abstract

Cone beam Computed Tomography (CBCT) enables three-dimensional imaging with isotropic resolution. X-rays scatter estimation is a big challenge for quantitative CBCT imaging of thorax: scatter level is significantly higher on cone beam systems compared to collimated fan beam systems. The effects of this scattered radiation are cupping artifacts, streaks, and quantification inaccuracies. In this paper, an original scatter management process on tomographic projections without supplementary on-line acquisitions is presented. The correction method is based on scatter calibration through off-line acquisitions, combined to an on-line analytical transformation issued from physical equations to adapt calibration to the observed object. Evaluations of the method were performed on an anthropomorphic thorax phantom. First, tomographic acquisitions were performed with a flat panel detector. Reconstructed volume obtained with the proposed scatter correction method has been compared with the one obtained through a classical beam stops method. Secondly, reconstructed volume has been compared with the one obtained through a fan beam system (Philips multi slice CT scanner). The new method provided results in good agreement with the beam stops approach and with the multi slice CT scanner, suppressing cupping artifacts and improving quantification significantly. Compared to the beam stops method, lower X-rays doses (divided by a factor 9) and shorter acquisition times were needed.

Paper Details

Date Published: 2 March 2006
PDF: 8 pages
Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61421B (2 March 2006); doi: 10.1117/12.650089
Show Author Affiliations
Jean Rinkel, CEA-LETI (France)
Laurent Gerfault, CEA-LETI (France)
François Estève, INSERM (France)
Jean-Marc Dinten, CEA-LETI (France)

Published in SPIE Proceedings Vol. 6142:
Medical Imaging 2006: Physics of Medical Imaging
Michael J. Flynn; Jiang Hsieh, Editor(s)

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