Depth for dose calibration in high energy photon beams

AbstractBackground and purpose: The normalisation depth for determination of output factors in photon fields has frequently been the depth ofdose maximum. At high energies the contribution from contaminating electrons is significant at dose maximum and is critically dependenton the beam geometry parameters, which is why a larger depth should be preferred.Materials and methods: The effect of electron contamination was studied using a purging magnet to remove charged particles from thetreatment he ...

External Beam Photon Dose Calculations_Thomas Rockwell Mackie

Correction-Based Dose Computation Model-Based Dose Computation What Has to Be Accounted ForIn Model Based Methods Modeling the Head Issues with the Leaf Shape Model-Based Methods Are Need for IMRT IMRT Is About Using Small Fields IMRT Is About Using Small Fields Extend the Beam Model Dose Computation as a Linear System , ... ...