Assessment of minimal aperture size for a plastic collimator for efficient formation of medical electron beams

We present here the results of an experimental study assessing the influence of the diameter of the collimation window in a 3D-printed plastic object on the dose distribution of a medical electron beam. Experiments were run using a test object developed and manufactured as a rectangular parallelepiped with 12 round perforating holes with different diameters. The experiments were carried out using a medical electron beam. The radiation was delivered in such a way that the axes of the apertures were parallel to the beam axis. The distributions profiles formed by each hole were captured. The results showed that development of electron beam-shaping devices should avoid collimation apertures of diameter less than 7 mm.