The introduction of hybrid technology — positron emission tomography/computed tomography (PET/CT) and single-photon emission computed tomography (SPECT)/CT -— has revolutionized the imaging world. This technology allows the combination of the exquisite anatomic details provided, for example, by CT, with the important and much needed functional, physiologic or metabolic information provided by molecular imaging. 

Computed tomography (CT) vendors have introduced several advancements in hardware and software in 2012. “You want lower dose, better accuracy, and you also want more special and temporal resolution,” said Elliot Fishman, M.D., FSCCT, professor of radiology and oncology, director, diagnostic radiology and body CT, Johns Hopkins University, Baltimore, Md. He said all CT vendors have created next-generation CT scanners to accomplish these goals. New technologies include use of iterative reconstruction, more sensitive detectors that emit less electronic noise, and new software and hardware features to lower dose. New detectors have increased quantum detector efficiency (QDE). The higher QDE, the better the sensitivity of the detector to receive more photons, so lower radiation doses are needed, he explained.