Evaluation of a physical based approach of scattered radiation correction in cone beam CT with an anthropomorphic thorax phantom

Jean Rinkel; Laurent Gerfault; François Estève; Jean-Marc Dinten

doi:10.1117/12.650089

2 March 2006 Evaluation of a physical based approach of scattered radiation correction in cone beam CT with an anthropomorphic thorax phantom

Jean Rinkel, Laurent Gerfault, François Estève, Jean-Marc Dinten

Author Affiliations +

Proceedings Volume 6142, Medical Imaging 2006: Physics of Medical Imaging; 61421B (2006) https://doi.org/10.1117/12.650089
Event: Medical Imaging, 2006, San Diego, California, United States

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.

Citation Download Citation

Jean Rinkel, Laurent Gerfault, François Estève, and Jean-Marc Dinten "Evaluation of a physical based approach of scattered radiation correction in cone beam CT with an anthropomorphic thorax phantom", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61421B (2 March 2006); https://doi.org/10.1117/12.650089

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