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| Image Reconstruction with Perturbed Trajectories in a C-Arm CT System |
| XU Ming, PU Fang, LI Shu-yu, NIU Hai-jun, FAN Yu-bo, LI De-yu |
| School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China |
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Abstract For a 3D C-arm computed tomography(CT) system, actual path of the scanner may deviate from the idea circle geometry because of mechanicalinstability, leading to perturbation artifacts in reconstructed images. In this paper, we proposed a modified FBP method for the perturbed trajectories taking into account 6 perturbation parameters without tassuming any condition to be ideal. The preliminary studies demonstrated that this algorithm can acquire promising reconstruction image quality even when the perturbations are relatively large. The comparison of performances among different perturbation parameters is useful for constructing a C-arm CT system.
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Received: 10 April 2015
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| Fund:Grant sponsor: Doctoral Program of Higher Education of China; grant number: 20093218110024; International Science and Technology Cooperation Grant; grant number: BZ2008060 |
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Corresponding Authors:
LI De-yu. E-mail: deyuli@buaa.edu.cn
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