Stereoscopic radiography techniques and apparatus

Claim 1

Apparatus for use with sterographic radiography, or the like, comprising, in combination: a source of X-radiation; recording means responsive to said X-radiation for recording a radiographic image; a platform disposed between said source and said recording means for movably supporting a subject therebetween; displacement means for causing said platform to be displaced about an axis of rotation; movable shield means disposed between said source and the subject for permitting a predetermined amount of X-rAdiation emitted by said source to reach the subject; and control means cooperatively coupled to said source and to said shield means and to said recording means for synchronously enabling a sequence of exposures to be made during movement of said platform about said axis of rotation; said recording means including a cassette support and at least one replaceable cassette, said cassette comprising a first grid and a light-responsive film disposed adjacent said first grid, and means cooperative with said control means for causing relative displacement between said film and said grid, said first grid being formed with a plurality of X-ray permeable slots extending substantially parallel with respect to said axis of rotation, said cassette further including an image intensifying screen disposed adjacent said first grid, said first grid being disposed between said film and said image intensifying screen, said image intensifying screen comprising fluorescent material capable of producing film-exposure radiation in response to unshielded X-radiation emitted by said source, thereby enabling a plurality of exposures of spaced portions of said film, said shield means including a shielding grid formed with a plurality of X-ray permeable slots extending substantially parallel with respect to the slots formed in said first grid.