New Radiographic and Isotopic Procedures in Neurological Diagnosis

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Abstract
RECENTLY, new special procedures in neurological diagnosis have been developed at the National Institute of Neurological Diseases and Blindness. These are radiographic (axial transverse encephalography) and isotopic (encephalography using radio-iodinated anti-fibrinogen, and ventriculography and cisternography using radio-iodinated serum albumin) methods. Axial Transverse Encephalography In the technique of fractional encephalography with tomography,1 two well-established radiographic methods are combined, fractional pneumoencephalography and tomography. In fractional pneumoencephalography, intrathecally injected air is followed with serial radiograms as it moves along, "fraction by fraction," through the cerebrospinal fluid pathways. Tomography is a radiographic technique in which the patient or the x-ray tube and film are subjected to various types of movement during the exposure. This results in a photographic blurring of the structures in all but a single layer of the body part under examination. This chosen layer, always in the plane in focus, thus appears sharp and distinct. In the technique of fractional