1. A method for calibrating a PET scanner, comprising the steps of: acquiring first phantom sinogram data from a scan of a first phantom within a PET scanner imaging FOV; acquiring second phantom sinogram data from a scan of a second phantom within the PET scanner imaging FOV; and determining a PET scanner detector component scanner efficiency normalization according to the steps of: determining a crystal efficiency factor as a function of the first and second phantom sinogram data, wherein the crystal efficiency factor is derived without a solid angle correction; determining a detector geometry factor as a function of the crystal efficiency factor and the first and second phantom sinogram data; and determining the PET scanner detector component scanner efficiency normalization from the crystal efficiency factor and the detector geometry factor.