title: Components op the flood-field uniformity index in a gamma camera.
abstract: The flood-field uniformity index has been investigated as a function of the total number of counts and the image matrix size. The analysis showed the dependence of the NEMA integral uniformity index on the counting statistics. A linear model to determine the noise-free component of the uniformity index that was applied successfully to the experimental data is presented. In addition, the heterogeneity of the integral uniformity index IU presented as a function of image matrix size m fits well to the fractal equation IU(m)/IU(1) = mD-1 with the fractal dimension D = 1.34. This result shows that the uniformity index could be handled as a fractal quantity.
authors.affiliation: Department of Oncology, Helsinki University Hospital, Finland.
authors.forename: M
authors.initials: M
authors.lastname: Tenhunen
authors.forename: J
authors.initials: J
authors.lastname: Pyykkönen
authors.forename: M
authors.initials: M
authors.lastname: Tenhunen-Eskelinen
authors.forename: K
authors.initials: K
authors.lastname: Jaatinen
authors.forename: J T
authors.initials: JT
authors.lastname: Kuikka
mesh_terms: D015902:Gamma Cameras; D006801:Humans; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D013667:Technetium; D015899:Tomography, Emission-Computed, Single-Photon
chemical_list: D013667:Technetium