Quantitation in Positron Emission Computed Tomography

摘要: Accidental coincidences (ACs) and methods of compensation for ACs were investigated in terms their effect on quantitation positron emission computed tomography (ECT). Formulations basic expressions describing the physical factors, which cause true or ACs, are presented to provide a framework contrasting two phenomena. Correction image data attenuation annihilation radiation nonuniformities detector efficiency is shown amplify errors caused by presence data. It was that failure compensate overestimates measurements isotope concentrations from many cases overestimate significant relatively modest percentages Three evaluated as accuracy statistical noise images. found nonuniform efficiencies could prominent artifacts if an inadequate method employed determination subtraction The additional produced images total coincidence demonstrates advisability minimizing AC rates spite ability adequately measure