The invention relates to an X-ray installation having two ceiling mounts (20, 30), to which the X-ray tube (26) respectively the X-ray detector (36) are fixed. The ceiling mounts comprise crossbeams (21, 31), which are mounted on the guide rails (11, 12) so as to slide in the longitudinal direction (Ls, LD) and which in turn carry carriages (22, 32) slidable in the transverse direction (Ts, TD). Length-adjustable arms (23, 33) are secured to the carriages (22, 23) and at their ends are mounted transverse arms (24, 34) rotatable about a vertical axis of rotation (R1S, R1D). The transverse arms in turn carry equipment carriers (25, 35) rotatable about axes of rotation (R2S, R2D), to which lastly the X-ray tube (26) respectively the X-ray detector (36) are secured.