2021
DOI: 10.1088/1361-6560/abe028
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An oblique projection modification technique (OPMT) for fast multispectral CT reconstruction

Abstract: In x-ray multispectral (or photon-counting) computed tomography (MCT), the object of interest is scanned under multiple x-ray spectra, and it can acquire more information about the scanned object than conventional CT, in which only one x-ray spectrum is used. The obtained polychromatic projections are utilized to perform material-selective and energy-selective image reconstruction. Compared with the conventional single spectral CT, MCT has a superior material distinguishability. Therefore, it has wide potentia… Show more

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Cited by 14 publications
(11 citation statements)
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“…Algorithm 2 shows the iteration scheme in the case of noise and the convergence proof of algorithm 2 can refer to [38].…”
Section: In the Case Of Noisementioning
confidence: 99%
See 1 more Smart Citation
“…Algorithm 2 shows the iteration scheme in the case of noise and the convergence proof of algorithm 2 can refer to [38].…”
Section: In the Case Of Noisementioning
confidence: 99%
“…Researchers usually model the process of obtaining MSCT data as nonlinear equations [26,38]. Omitting scattered photons and taking MSCT basis material decomposition as an example, the discrete nonlinear model of obtaining polychromatic projections is…”
Section: Introductionmentioning
confidence: 99%
“…For example, Zhao et al utilized the first-order Taylor expansion of nonlinear observations and proposed an extended algebraic reconstruction technique (EART) [ 17 ] for DECT. For the consideration of the convergence efficiency, couple variants of EART have been proposed, e.g., the simultaneous EART (ESART) [ 18 ], the oblique projection modification technique [ 19 ], and the monochromatic images guided iteration method [ 20 ] in recent years. In addition, as the photons emitted by the X-ray source contain continuous energy distribution, and it is empirically assumed that the attenuated photons received by the detector follow the Poisson distribution, different statistical-based iterative methods have emerged.…”
Section: Introductionmentioning
confidence: 99%
“…Iterative methods [25][26][27][28][29][30][31][32][33][34][35][36] based on statistical models or nonlinear optimization can effectively improve the quality of the reconstructed images by introducing prior knowledge and establishing approximate model to iteratively solve the DECT model and obtain the basis material projections. However, iterative reconstruction methods exhibit low convergence speed and high computational cost.In 2000,Sukovi et alproposed a penaltyweighted least squares reconstruction method 25 by adding a statistical model to the reconstruction method to process incomplete data sets and obtain images with high signal-to-noise ratio (SNR).…”
Section: Introductionmentioning
confidence: 99%
“…Iterative methods 25–36 based on statistical models or nonlinear optimization can effectively improve the quality of the reconstructed images by introducing prior knowledge and establishing approximate model to iteratively solve the DECT model and obtain the basis material projections. However, iterative reconstruction methods exhibit low convergence speed and high computational cost.…”
Section: Introductionmentioning
confidence: 99%