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17 October 2022 Preliminary study on image reconstruction for limited-angular-range dual-energy CT using two-orthogonal, overlapping arcs
Buxin Chen, Zheng Zhang, Dan Xia, Emil Y. Sidky, Xiaochuan Pan
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Proceedings Volume 12304, 7th International Conference on Image Formation in X-Ray Computed Tomography; 123041P (2022) https://doi.org/10.1117/12.2647074
Event: Seventh International Conference on Image Formation in X-Ray Computed Tomography (ICIFXCT 2022), 2022, Baltimore, United States
Abstract
Dual-energy CT (DECT) of limited-angular ranges (LARs) collects data from angular ranges smaller than π for low- and high-kVp scans, and thus may potentially be exploited for reducing scanning time and radiation dose and for avoiding collision between the imaged object and the moving gantry of the scanner. Image artifacts resulting from beam hardening (BH) and limited-angular range (LAR) can be suppressed by using the data-domain decomposition and the directional-total-variation (DTV) algorithm for image reconstruction. In this work, we investigate two-orthogonal-arc (TOA) scanning configuration with overlapping arcs for collecting LAR DECT data, in an effort to reduce LAR artifacts and improve quantitative accuracy of estimated physical quantities. The TOA configuration consists of two arcs, of equal LAR, whose centers are positioned 90° apart, and is designed to reduce the ill-conditionedness of the imaging system matrix. The data are decomposed into basis sinograms, from which basis images are reconstructed using the DTV algorithm. Visual inspection of the monochromatic images and quantitative estimation of the effective atomic numbers suggest that the TOA configuration, as compared to the single-arc (SA) configuration of the same total angular range, can help reduce remaining LAR artifacts and bias in the estimated atomic number relative to the reference values from the full-angular-range data of 360° .
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Buxin Chen, Zheng Zhang, Dan Xia, Emil Y. Sidky, and Xiaochuan Pan "Preliminary study on image reconstruction for limited-angular-range dual-energy CT using two-orthogonal, overlapping arcs", Proc. SPIE 12304, 7th International Conference on Image Formation in X-Ray Computed Tomography, 123041P (17 October 2022); https://doi.org/10.1117/12.2647074
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KEYWORDS
Data modeling
Reconstruction algorithms
Computed tomography
Compton scattering
Photoelectric effect
Visualization
X-rays
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