ABSTRACT
Continuing technical innovations are expanding the applicability and usefulness of non-invasive imaging modalities such as ultrasound, nuclear imaging, positron emission tomography, magnetic resonance imaging and computed tomography (CT). CT is one of the many applications of X-ray radiation in clinical medicine. The process of CT can be divided into the following steps: data acquisition, image reconstruction, post-processing, evaluation and reporting, and data storage and exchange. The CT images on screen are an analog visual representation of binary values that have been digitally processed. The image consists of a matrix of discrete attenuation values that are the result of sampling and computer processing. Originally, all CT scanners sequentially acquired axial slices according to the stop-and-shoot principle. Spiral CT systems transmit energy and data between the rotating and stationary scanner parts via electrically conductive brushes and rotating rings.
