[Electron therapy using wedge filters. I. Experimental studies using wedge filters made from polystyrol]

Based on dose measurements at the phantom, the dose distributions obtained during electron therapy by the use of wedge filters made of polystyrol are reported. Energy doses from 15 to 42 MeV were applied; angles of wedges amounted to 10 degrees, 30 degrees, 45 degrees, and 60 degrees. Only by wedge-angles larger than 45 degrees, it was possible to bring about significant changes in the dose distribution. The results obtained are presented diagrammatically. The influence exerted by the wedge-angle and by electron energy upon the inclination of the 50%-isodose to the axis of the useful beam is shown by tables.