ABSTRACT
Since its invention in the 1970s, computed tomography (CT) has become an indispensable diagnostic tool in medicine. CT scanning using X-rays was the rst clinical tomographic imaging technique and was later complemented by tomographic imaging modalities based on other physical principles, such as magnetic resonance imaging (MRI), positron emission tomography (PET), and single-photon emission computed tomography (SPECT). Today, medical radiology is still the primary application eld for CT, but this imaging technology has diverted also into other elds of science and engineering, for instance, nondestructive testing, ow measurement, and small-animal imaging.
