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In the reconstruction, the misaligned geometry will cause streak artifacts which influence image quality. Here we propose a method to calibrate all the parameters simultaneously with the matrix form. In some cases, the relative position between the X-ray source and the detector is known and invariant, and then we can build a Cartesian coordinate system for the source and the detector. At the same...
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...
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