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Low-dose X-ray computed tomography (CT) simulation from a high-dose scan is required in optimizing radiation dose to patients. In this paper, we propose a simple low-dose CT simulation strategy in the sinogram domain using the raw data from high-dose scan. Specially, a relationship between the incident fluxes of low- and high-dose scans is first determined according to the repeated projection measurements...
Spectral computed tomography (CT) with energy-resolved detector has gained considerable interests in recent years due to its remarkable abilities in yielding high energy resolution and material differentiation. However, because of the limited photon counts using narrow energy bin, spectral CT images usually suffer from poor SNR and strong streak artifacts. In this work, to restore each energy-specific...
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