Implementation of Varian's EDW 5.2 on a Clinac 2300C/D for use with Helax TMS 3.1 dose planning system

An EDW field is in principle a sum of fields with different sizes. The Helax TMS 3.1 dose planning system uses pre-existing open beam data and information specific to the geometry of the accelerator treatment head including flattening filter and collimators to generate open fields. These open fields are then summed using the Segmented Treatment Tables (STT) to generate the Enhanced Dynamic Wedge fields. Verification of predicted fields and output factors against measured data are discussed for different wedge angles, asymmetric fields and shaped fields.