Components op the flood-field uniformity index in a gamma camera.
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.
Tenhunen
M
M
Department of Oncology, Helsinki University Hospital, Finland.
Pyykkönen
J
J
Tenhunen-Eskelinen
M
M
Jaatinen
K
K
Kuikka
J T
JT
D015902:Gamma Cameras; D006801:Humans; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D013667:Technetium; D015899:Tomography, Emission-Computed, Single-Photon
D013667:Technetium