ABSTRACT
Medical imaging devices commonly use gamma and x-ray radiation to generate internal images of the human body. Single photon emission tomography (SPECT) and positron emission tomography (PET) systems detect gamma emissions of radionuclide tracers. Computed tomography (CT), radiography, and mammography systems measure the x-ray attenuation of the human body. Figure 4.1 outlines the modes of operation of SPECT, CT, and radiography devices.
