ABSTRACT
Tomography, as a special type of radiography, originated shortly after the 1914–18 World War and the name is derived from the Greek 'tomos', meaning a section, and was proposed by Grossman of Berlin in 1935 for the apparatus he designed for lung tomography. 'The announcement of a machine used to perform X-ray computed tomography in a clinical environment, by Godfrey Hounsfield at the 1972 British Institute of Radiology annual conference, has been described as the greatest step forward in radiology since Wilhelm Conrad Rontgen's discovery.' 'The X-ray tube and the film move synchronously in opposite directions during the exposure. They are connected by a bar permitting this about an adjustable fulcrum in the plane of the desired section. The central ray may move perpendicular to the plane of the section throughout or be continuously directed to the centre of this plane. Numerous modifications have been explored, particularly possible movements of the tube focus which includes rectilinear, circular, spiral and sinusoidal.'
