The changing roles of electronic portal imaging devices in radiotherapy
Historically, portal films were used in radiotherapy to verify treatment field placement and patient positioning. These films were placed orthogonal to the beam axis behind the patient. The films were exposed using the mega-voltage (MV) energy photons of the treatment beam and were subsequently analysed to ensure that the patient was being treated as planned […]
Dr Vibeke Hansen, Dr Ian Hanson
The Royal Marsden NHS Foundation Trust and The Institute of Cancer Research