Tele-Autotomogram and Application of the Pneumoencephalographic Chair in Stereotactic Operations

In order to obtain clearly demonstrated reference points in a preliminary air study for target calculations in stereotactic brain operations, a tele-autotomogram taken with the rotating pneumoencephalographic chair has been used with excellent results. By means of multiaxial rotations of the chair, tele-roentgenograms, including an autotomogram with a constant small magnification, can be obtained easily at any position of the patient with one floor X-ray tube. The same chair, modified to support the stereotactic base ring, can serve as an excellent stereotactic operating table with good maneuverability, offering wide adjustment of the patient's position suitable for various operative approaches. Simultaneously, it produces identical tele-roentgenograms with the same magnification as in the preliminary study, which economizes calculation time and avoids possible measurment error during stereotactic operations.