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Measured compared with calculated total multileaf collimator (MLC) transmission (direct and scatter) for various x and y jaw positions as a function of field area. Dose ratios (R) were measured for the Varian 6EX (6 MV) in air with an A12 ionization chamber and aluminum buildup cap. For the points outside the field, (x2), (y1), and (x2,y1) indicate the jaw or jaws behind which the ionization chamber was placed.
