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The importance of performing exact image reconstruction from the minimum amount of data has been recognized for a longtime. Yangbo Ye et al. has proved that the interior problem can be exactly and stably solved if a subregion in an ROI/VOI in the FOV is known from fan-beam/cone-beam projection datasets using the analytic continuation technique. But the analytic continuation is a very ill-posed question...
We present a terahertz phase contrast imaging technique based on the iterative phase retrieval method which can be realized readily on the conventional terahertz intensity measurement system. The complex wave field of terahertz radiation in the object plane (i.e., the terahertz phase image) is reconstructed from its measured Fourier transform magnitude using the Gerchberg-Saxton-Fienup algorithm with...
X-ray phase contrast imaging (PCI) has great potential in the medical diagnosis, material science et al and has made great progress in the last ten years. Diffraction enhanced imaging and grating-based imaging are the two significant methods for PCI, currently. Two methods are named differential phase contrast imaging because the projection data is partial derivatives of refractive index. Analytical...
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...
In applications of tomographic imaging, insufficient data problems can take various forms, such as few-view projection imaging which enables rapid scanning with lower X-ray dose. In this work, an iterative reconstruction-reprojection (IRR) algorithm with total variation (TV) constraint is developed for few-view projections. The IRR algorithm is used to estimate the missing projection data by iterative...
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