1. Statistical CT reconstruction using region-aware texture preserving regularization learning from prior normal-dose CT image
- Author
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Zhengrong Liang, Dong Zeng, Xiao Jia, Ji He, Jing Huang, Zhaoying Bian, Yongbo Wang, Xi Tao, Yuanke Zhang, Jianhua Ma, Yuting Liao, and Hao Zhang
- Subjects
Computer science ,Gaussian ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Iterative reconstruction ,Radiation Dosage ,Article ,030218 nuclear medicine & medical imaging ,Machine Learning ,03 medical and health sciences ,symbols.namesake ,0302 clinical medicine ,Image Processing, Computer-Assisted ,Humans ,Leverage (statistics) ,Radiology, Nuclear Medicine and imaging ,ComputingMethodologies_COMPUTERGRAPHICS ,Radiological and Ultrasound Technology ,Radon transform ,business.industry ,Pattern recognition ,030220 oncology & carcinogenesis ,symbols ,Artificial intelligence ,Tomography, X-Ray Computed ,business ,Algorithms ,Ct reconstruction - Abstract
In some clinical applications, prior normal-dose CT (NdCT) images are available, and the valuable textures and structure features in them may be used to promote follow-up low-dose CT (LdCT) reconstruction. This study aims to learn texture information from the NdCT images and leverage it for follow-up LdCT image reconstruction to preserve textures and structure features. Specifically, the proposed reconstruction method first learns the texture information from those patches with similar structures in NdCT image, and the similar patches can be clustered by searching context features efficiently from the surroundings of the current patch. Then it utilizes redundant texture information from the similar patches as a priori knowledge to describe specific regions in the LdCT image. The advanced region-aware texture preserving prior is termed as ‘RATP’. The main advantage of the PATP prior is that it can properly learn the texture features from available NdCT images and adaptively characterize the region-specific structures in the LdCT image. The experiments using patient data were performed to evaluate the performance of the proposed method. The proposed RATP method demonstrated superior performance in LdCT imaging compared to the filtered back projection (FBP) and statistical iterative reconstruction (SIR) methods using Gaussian regularization, Huber regularization and the original texture preserving regularization.
- Published
- 2018