A C-arm X-ray diagnostic equipment is disclosed which C-arm provides: an increased range of orbital rotation; a longer range of vertical travel of C-arm from low to high vertical positions; safer counter balanced vertical movement; the horizontal axis of rotation drawn through the isocenter of the C-arm for a multiple of X-ray beam projections without repositioning of the patient being imaged; remotely controlled passive locking arrangement for securing the C-arm firmly in any necessary position for safety; remotely controlled C-arm positioning. A novel non-uniform curvature of C-arm where the inner outline is other than semicircular is selected for structural strength.
