Search for: [Abstract = "The results show that the implementation of the OSEM \(Ordered Subsets Expectation Maximization\) algorithm with a one\-dimensional fit to the Gaussian CDR \(Collimator\-Detector Response\) function provides the best results in terms of adopted measures. However, the fit of the two\-dimensional function also gives satisfactory results. Furthermore, the CDR function has the potential to be applied to a fully 3D OSEM implementation. The lack of the CDR in system matrix calculation results in a very noisy image that cannot be used for diagnostic purposes."]

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