Abstract
A method of applying accurately directed multiple small fields to the skull is described. The object prompting this work has been to develop a small volume—high dose treatment technique for patients with cerebral tumours to see if there are any advantages in such an individualised small field treatment technique over the more usual large field methods irradiating one or more quadrants of the brain. The use of numerous mechanical devices is described which render the method rather elaborate, but once these have been put into use it is found that they make for simplicity both mapping treatment fields and setting up for treatment. The extra trouble seems fully justified by providing restriction of field size, accuracy of aim, fixed treatment conditions, and adequate data for accurate estimation of the dose distribution.
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