The aim of generating low-noise projections was to be able to adjust the mean number of total counts to that representative of a clinical study, and to generate Poisson noise [23, 24] typical of realistic projections.
No amplifiers or excessive noise, or projection of any videos or slides, or activities that would interfere with subway operations or safety.
Using the statistical property of the system noise, a projection algorithm is proposed for parameter estimation.
Our modeling takes into account both Poisson noise in projections and loss of spatial resolution (constant Gaussian rather than a distance dependent function).
In the proposed approach, the mismatch vector of the desired steering vector is estimated by solving a quadratically constrained quadratic programming problem using an interference-plus-noise subspace projection matrix.
(N = 24) Dog-Noise (DN) – non-informative sound: presentation of Brownian noise with projections of dog pictures.
Figure 4 illustrates the effect of NAD on a reconstruction which suffers from both Poisson noise in the projections and projection misalignment, using the exact same settings for tomoand as in the first example.
Sufficiently many histories were simulated to attain essentially noise-free projections.
The approach is based on inverting a continuous model of the tomographic experiment, which assumes that an infinite number of noise-free projections are available.
