Electron therapy of intraorbital tumors

The authors describe a modification of a previously reported method of treating intraorbital tumors using multiple electron beams. An adjustable metal shield is inserted in the electron tube to protect the lens. The three-dimensional dose distribution was determined by film measurements and the film density measured with an RFA-1 densitometer on line with a computer. The density values were stored in a three-dimensional matrix. Different planes in the matrix can be selected for isodose plotting.