Keywords:
spectral CT, spiral CBCT, adaptive MAP, weighted FDK
The goal of this paper is to evaluate an analytic spiral cone-beam CT (CBCT) algorithm for spectral CT to provide a fair comparison platform for the state-of-the-art iterative reconstruction algorithms. Considering the fact that a narrow energy channel has high noise which degrades the imaging quality of spectral CT, an adaptive maximum a posterior (MAP) sinogram restoration algorithm is first used to reduce the noise and then a three dimensional weighted Feldkamp-Davis-Kress (FDK) algorithm is implemented to reconstruct the spectral CT images at different energy channels. Our numerical results show that the analytic reconstruction approach is fast and it can provide high spatial resolution, high contrast resolution and high signal-noise-ratio (SNR) with higher helical pitches. This makes it possible to serve as a platform to evaluate the state-of-the-art iterative spectral CT algorithms.
- Huihua Kong
- North University of China
- Rui Liu
- University of Massachusetts Lowell
- Hengyong Yu
- University of Massachusetts Lowell
- Y. Xi, Y. Chen, R. Tang, J. Sun and J. Zhao, “United iterative reconstruction for spectral computed tomography,” IEEE Trans. Med. Imag., Vol. 34, pp. 769-778, Mar. 2015.
- L. Li, Z. Chen, W. Cong and G. Wang, “Spectral CT Modeling and Reconstruction with Hybrid Detectors in Dynamic-Threshold-Based Counting and Integrating Modes,” IEEE Trans. Med. Imag., Vol. 34, pp. 716-728, Mar. 2015.
- P. He, H. Y. Yu, J. Bennett, P. Ronaldson, R. Zainon, A. Butler, P. Butler, B. Wei and G. Wang, “Energy-discriminative performance of a spectral micro-CT system,” Journal of X-ray science and technology, Vol. 21, pp. 335-345, 2013.
- H. Yu, Q. Xu, P. He, et. al, “Medipix-based spectral Micro-CT,” CT Theory and Applications, Vol. 21, pp. 583-596, Dec. 2012.
- Y. Zhang, J. Zhang, and H. Lu, “Statistical sinogram smoothing for low-dose CT with segmentation-based adaptive filtering,” IEEE Trans. Nuc. Sci. Vol. 57, Oct. 2010.
- J. Wang, T. Li, H. Lu, and Z. Liang, “Penalized weighted least-squares approach to sinogram noise reduction and image reconstruction for Low- Dose X-ray computed tomography,” IEEE Trans. Med. Imag., Vol. 25, pp.1272-1283, Otc. 2006.
- X. Cui, Q. Zhang, H. Shangguan, Y. Liu and Z. Gui, “The asaptive sinogram restoration algorithm based on anisotropic diffusion by energy minimization for low-dose X-ray CT,” Optik, Vol. 125, pp. 1694-1697, 2014.
- X. Tang, J. Hsieh, R. A. Nilsen, S. Dutta, D. Samsonov, and A. Hagiwara, “A three-dimensional-weighted cone beam filtered backprojection (CB-FBP) algorithm for image reconstruction in volumetric CT—helical scanning,” Phys. Med. Biol., vol. 51, pp. 855- 874, Feb. 2006.
- G. Wang, T. H. Lin, P. C. Cheng, D.M. Shinozaki, “A general cone-beam reconstruction algorithm,” IEEE Trans. Med. Imag., Vol. 12, pp. 486-496, Sep. 1993.