Formation device and bolus manufacturing method null of die for bolus formation of radiotherapy

摘要

PURPOSE:To manufacture a bolus simply, quickly and accurately by a method wherein slender- wire-shaped pins having a prescribed length and a rectangular section are brought into close contact with each other and fitted in a frame for forming a mold of a vertically open type. CONSTITUTION:When a mold WA for molding a bolus is formed, insertion pins (not shown in the figure) on the upper part of which slender-wire-shaped pins 2, 2... are disposed push in the corresponding slender-wire-shaped pins 2, 2... sequentially respectively by a three- dimensional operation in X-Y-Z under the control of a computer, on the basis of data obtained from an image of X-ray CT or the like, data obtained directly from a patient, or the like. An operation for inserting the pins 2 does not cause accompaniment of the adjacent pins 2, due to the frictional resistance of brake pins 6, 6..., and the pins are inserted discretely to depths according to an operation instruction. Based on the data obtained from the image of X-ray CT, or the like, a curved surface P forming an internal space part V of the mold WA for molding the bolus, which is in accord with the location and the shape of a focus and the curve of the surface of a human body is obtained. While the curved surface P is sorted into a focus portion type and a human body surface portion type, in other words, these types of the curved surface is formed accurately and also very quickly and easily on the basis of the operation instruction controlled by the computer.