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1 From the Department of Radiology, Columbia University College of Physicians and Surgeons, and the Radiological Service of the Neurological Institute, Columbia-Presbyterian Medical Center, New York, New York
A new roentgenographic unit for skull roentgenography, pneumoencephalography, ventriculography, and angiography is described. The unit incorporates a chair which will somersault the patient completely in a forward or backward direction, keeping the center of the head at a fixed point in space. The frontal projections are obtained with the central ray passing from
[See Figure in the PDF file]
behind forward, and with the film always at 90° to the central ray, giving a minimum of distortion. Midline tomography (autotomography) is performed mechanically, and linear laminagraphy may also be performed with the patient in any position.
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