Abstract: In a computerized tomographic apparatus for radiographic apparatus it has been proposed to orbit a source of X-radiation through several revolutions of the body of the patient. It is desirable to provide cooling to remove generated heat from the X-ray source, this being usually achieved by a cooling fluid such as oil. It is now proposed to provide a closed circuit cooling arrangement, for the source, comprising a circulatory oil path mounted to share in the orbit of the source without external fluid connections. To assist in cooling, the circuit is provided with a radiator and arranged such that, during pauses in the orbit, the radiator is brought to rest in a forced draught from a non-orbiting cooling fan.

Abstract: A driving and positioning arrangement for radiography includes a patient support which can be driven, in a direction longitudinally of the patient, through an aperture in a housing which contains the active elements of a computerised tomographic apparatus. A scale member comprises a part which is supported by the housing and a part which is supported by the patient support. Once the patient is correctly positioned for examination, one of the parts of the scale member is moved relative to its respective support so that the two parts can be caused to assume a selected relative position.

Abstract: Apparatus is described for performing a computerized axial tomographic examination of a body. The apparatus contains a source of x-radiation and detector devices mounted to face one another across an opening for the body, the source being arranged to project said radiation in a plane towards the detector devices. The source and detector devices are rotated about an axis passing through said opening and means are disclosed for locating the body in said opening and for adapting the apparatus to accommodate a body which is not centrally located in said opening.