Computed tomography is a diagnostic imaging method that uses a moving source of X-rays. After acquiring images from various positions of the source in relation to the patient, the information is processed by a computer, resulting in a more precise reconstruction than that obtained by simple radiographs.
In modern machines, three-dimensional reconstruction of the images can also be performed. Furthermore, newer equipment uses a technique called helical tomography, which can produce even more detailed images compared to conventional tomography.
In some cases, a CT scan may require the intravenous injection of a contrast substance used to enhance blood vessels and structures with a high blood supply.
The CT scan is painless, but the injection of contrast may cause a warm sensation. In people with hypersensitivity, there may be an allergic reaction to the contrast.
There is also another type of computed tomography, called positron emission tomography (PET scan).
