The quality assurance of enhanced dynamic wedges

Dynamic wedge distributions are produced by closing one jaw continuously while simultaneously controlling dose as each position of the jaw. This method of producing wedge distributions requires more frequent Quality Assurance checks, such as verification of wedge profile, wedge factor and verification of the accuracy of the digital position readout for the jaws used for dynamic wedge. "Hard" wedges require only the verification of wedge factor and the verification of reproducibility of mechanical position in the beam. This paper will discuss methods and equipment used for the Quality Assurance of Enhanced Dynamic Wedges.