Bayesian statistical reconstruction for low-dose X-ray computed tomography using an adaptive-weighting nonlocal prior
✍ Scribed by Yang Chen; Dazhi Gao; Cong Nie; Limin Luo; Wufan Chen; Xindao Yin; Yazhong Lin
- Book ID
- 104015857
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 760 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0895-6111
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✦ Synopsis
How to reduce the radiation dose delivered to the patients has always been a important concern since the introduction of computed tomography (CT). Though clinically desired, low-dose CT images can be severely degraded by the excessive quantum noise under extremely low X-ray dose circumstances. Bayesian statistical reconstructions outperform the traditional filtered back-projection (FBP) reconstructions by accurately expressing the system models of physical effects and the statistical character of the measurement data. This work aims to improve the image quality of low-dose CT images using a novel AW nonlocal (adaptive-weighting nonlocal) prior statistical reconstruction approach. Compared to traditional local priors, the proposed prior can adaptively and selectively exploit the global image information. It imposes an effective resolution-preserving and noise-removing regularization for reconstructions. Experimentation validates that the reconstructions using the proposed prior have excellent performance for X-ray CT with low-dose scans.