Example of synthetic image with additional Poisson noise with an angular dependent magnitude (left) and the result of applying ACF on the images (right)

<p><b>Copyright information:</b></p><p>Taken from "Non-isotropic noise correlation in PET data reconstructed by FBP but not by OSEM demonstrated using auto-correlation function"</p><p>BMC Medical Imaging 2005;5():3-3.</p><p>Published online 13 May 2005</p><p>PMCID:PMC1142517.</p><p>Copyright © 2005 Razifar et al; licensee BioMed Central Ltd.</p>