By improving the localization of foci of pathological tracer uptake and offering information on their computed tomography (CT) morphology, single photon emission computed tomography (SPECT)/CT hybrid imaging has considerably improved the diagnostic accuracy of skeletal scintigraphy. SPECT/CT also has the potential to measure tracer uptake in vivo in absolute units. The present article reviews the methodology for and the potential clinical impact of quantitative skeletal scintigraphy.