Joint Reconstruction and Spectrum Refinement for Photon-Counting-Detector Spectral CT

Shen, Le; Xing, Yuxiang; Zhang, Li

doi:10.1109/tmi.2023.3261999

Cited by 3 publications

(1 citation statement)

References 37 publications

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“…Further, Zhao et al ( 38 ) followed this framework and developed a spectral CT imaging method based on blind separation of polychromatic projections with Poisson prior, which improved the accuracy of narrow-energy-width projections. Similar frameworks have been developed by various modifications and applied to broader application scenarios ( 39 ). These methods eliminate the extra workload of spectral estimation and show emerging potential in alleviating the negative impact caused by errors from spectral mismatch.…”

Section: Introductionmentioning

confidence: 99%

MISD-IR: material-image subspace decomposition-based iterative reconstruction with spectrum estimation for dual-energy computed tomography

Ren,

Wang,

Cai

et al. 2024

Quant Imaging Med Surg

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Background Dual-energy computed tomography (DECT) is a promising technique, which can provide unique capability for material quantification. The iterative reconstruction of material maps requires spectral information and its accuracy is affected by spectral mismatch. Simultaneously estimating the spectra and reconstructing material maps avoids extra workload on spectrum estimation and the negative impact of spectral mismatch. However, existing methods are not satisfactory in image detail preservation, edge retention, and convergence rate. The purpose of this paper was to mine the similarity between the reconstructed images and the material images to improve the imaging quality, and to design an effective iteration strategy to improve the convergence efficiency. Methods The material-image subspace decomposition-based iterative reconstruction (MISD-IR) with spectrum estimation was proposed for DECT. MISD-IR is an optimized model combining spectral estimation and material reconstruction with fast convergence speed and promising noise suppression capability. We proposed to reconstruct the material maps based on extended simultaneous algebraic reconstruction techniques and estimation of the spectrum with model spectral. To stabilize the iteration and alleviate the influence of errors, we introduced a weighted proximal operator based on the block coordinate descending algorithm (WP-BCD). Furthermore, the reconstructed computed tomography (CT) images were introduced to suppress the noise based on subspace decomposition, which relies on non-local regularization to prevent noise accumulation. Results In numerical experiments, the results of MISD-IR were closer to the ground truth compared with other methods. In real scanning data experiments, the results of MISD-IR showed sharper edges and details. Compared with other one-step iterative methods in the experiment, the running time of MISD-IR was reduced by 75%. Conclusions The proposed MISD-IR can achieve accurate material decomposition (MD) without known energy spectrum in advance, and has good retention of image edges and details. Compared with other one-step iterative methods, it has high convergence efficiency.

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Section: Introductionmentioning

confidence: 99%