Abstract: The invention relates to an X-ray CT examination installation, with an X-ray tube with a focus, which creates a fan beam or a conical beam which X-rays the whole of a detector located at a defined distance from the focus, and with an examination carriage, for receiving an object to be examined, which has an axis of rotation rotatable perpendicular to the plane of the fan beam or to the central axis of the conical beam. It is provided according to the invention that the examination carriage can be fixed on at least one measuring point, wherein each of these measuring points is arranged such that the axis of rotation is on a measuring line which emanates from the focus and includes a tilt angle ? with the central axis of the fan beam or the conical beam. The invention also relates to a CT method of examining objects, in particular of different sizes, by means of an X-ray CT examination installation according to the invention.