X-ray apparatus for angiography has a support member which is rotatable about a vertical axis and a U-shaped arm mounted on the support for rotating about a horizontal axis. A radially movable carriage with an x-ray source mounted on it is mounted at one end of the U-arm. Carriages which are movable...http://www.google.co.uk/patents/US4358856?utm_source=gb-gplus-sharePatent US4358856 - Multiaxial x-ray apparatus
