Objective(s): We evaluated edge artifacts in relation to phantom diameter and reconstruction parameters in point spread function (PSF)-based positron emission tomography (PET) image reconstruction.Methods: PET data were acquired from an original cone-shaped phantom filled with 18F solution (21.9 kBq/mL) for 10 min using a Biograph mCT scanner. The images were reconstructed using the baseline or...

We consider Gaussian quantum circuits supplemented with non-Gaussian input states and derive sufficient conditions for efficient classical strong simulation of these circuits. In particular, we generalise the stellar representation continuous-variable to multimode setting relate rank states, a recently introduced measure non-Gaussianity, cost evaluating classically output probability densities ...

This article presents a new image denoising algorithm that uses Gaussian Symmetric Markov random fields based on maximum posteriori estimation. First, an model is built, and the problem was converted to estimation problem. The prior probability of can be estimated using Gibbs distribution, which equivalent fields. Second, calculated expectation-maximization conjugate gradient method, where used...

In this paper, the nonlinear lattice-Hammerstein filter and its properties are derived. It is shown that the error signals are orthogonal to the input signal and also backward errors of different stages are orthogonal to each other. Numerical results confirm all the theoretical properties of the lattice-Hammerstein structure.