Georgios I. Angelis

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Direct application of the expectation maximisation (EM) algorithm to the spatiotemporal maximum likelihood problem results in a convenient separation of the image based problem from the projection(More)
Estimation of non-linear micro-parameters is a computationally demanding process, since it involves the use of iterative non-linear fitting algorithms and it often results in very noisy parametric(More)
Measuring the spatially variant point spread function (PSF) on a PET scanner involves using a point source to sample the field of view (FOV) at multiple locations. However, since most clinically used(More)