Abstract
The investigation reported here verifies Dussik's finding that an ultrasonic transmission method can yield ventriculograms without air injection. The outline of the liquid filled ventricle within the brain is usually deformed in the presence of a tumor. The ventricular geometry is depicted by graphical (automatic scanning) representation of intensity transmitted through the head. Experimental evidence indicates a safe working margin below pain and damage thresholds. The method utilizes the large available range of differential attenuation (order of .01 db/cm in the liquid and 1 to 3 db/cm in brain tissue, at frequencies of 1 to 3 megacycles). Results of basic studies on attenuation, scattering and resolution capabilities are reported.
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