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Material decomposition in spectral CT will amplify the noise, and the reconstructed image can be noisy and suffers from severe ring artifacts due to pixel inconsistency in photon counting detectors. Meanwhile, the images reconstructed directly from the polychromatic projections have much less artifacts and share the same structural information with the material images, which can be utilized to suppress...
Dual-energy Computed Tomography (DECT) is a useful tool that has been used widely in the security field and clinical diagnosis, because of its outstanding capability of material identification. One of the widely used pre-reconstruction methods for DECT is dual effect decomposition method. But the method only takes the compton scattering and photoelectric effect into consideration and ignores other...
Dual-energy computed tomography (DECT) allows one to obtain both density and atomic number and thus can provide information about material composition of scanned objects. In this paper, we extend a basis material decomposition method for high energy X-ray DECT used in cargo inspection. It differs from conventional DECT reconstruction methods by pair-production effect coming into play in the reconstruction...
Tomosynthesis is one of three-dimensional imaging techniques that can remove the effect of overlapping phenomena in radiography, except for computed tomography (CT). In general, CT needs at least hundreds of projections to reconstruct every cross-sectional slice of the samples accurately, while tomosynthesis just requires dozens of projections to reconstruct a series of tomosynthetic slices approximately,...
For high resolution CT image reconstruction, algebraic reconstruction methods are widely used to get relatively good image quality. However, the slow speed has prohibited its routine use in clinical and industrial applications. Many GPU-based accelerated algebraic reconstruction methods have been presented for three-dimensional (3D) reconstruction in cone beam CT. But for the high resolution two-dimensional...
When there are objects moving during CT acquisition process and each object has independently rigid motion which includes translation and rotation, the reconstruction will suffer from perceptible motion artifacts. To suppress such artifacts, one way is to implement motion estimation into reconstruction algorithms. In this paper, we give a new forward projection iterative method. With a priori knowledge...
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