Abstract: An X-ray imaging apparatus comprises a base installed in an examination room, an intermediate frame coupled to the base via a horizontal first rotary shaft, an arm coupled to the intermediate frame via a horizontal second rotary shaft, a mechanism, provided at one end portion of the arm, for removably supporting at least one X-ray generating unit, the X-ray generating unit supported by this mechanism, a mechanism, provided at the other end portion of the arm, for supporting at least one X-ray detection unit, and the X-ray detection unit supported by this mechanism.

Abstract: A protection cover includes a pressure responsive means mounted within the cover along its inner wall surface and which operates responsive to external forces to be exerted upon contact with a neighboring object. The protection cover is provided at a portion where physical contact may occur between any of movable or rotating component devices of an X-ray diagnostic apparatus, such as, an X-ray exposure unit or an image intensifier, and a neighboring object which is in the path of the component devices, such as, a subject or a catheter table. The protection cover may, for example, be provided at a moving end of a component X-ray diagnostic apparatus, such as, the forward end of the image intensifier, or may be mounted, instead of being mounted on a movable component device, on a neighboring object at its side facing to the movable part of the component devices, such as, a stand section of the catheter table, which lies in the path of a moving part of the X-ray radiographing component devices.