Patent ID: 7241045

Claim:
A calibration system for a stereoradiographic device having an X-ray source and a vertical X-ray receiver, the calibration system comprising: a horizontal table which rotates between two reference positions that are separated by 90 degrees in a horizontal plane of the table; a vertical frame fastened to the horizontal table and symmetrical with an axis of rotation of the table, the frame accommodating a patient that remains stationary relative to the frame as the table is rotated between its two reference positions wherein corresponding X-ray photographs are taken; at least three markers made of radio opaque material firmly attached to the frame, one of the markers representing the origin of orthogonal X,Y and Z axes, a second of the markers located at a predetermined point along the X-Y axes, the third marker located at a known distance along the Z axis, the markers defining respective distances Lx, Ly or H relative to the origin.