Tag: radiotherapy

  The X-Ray Imaging System on Varian TrueBeam Linear Accelerators can be used to acquire fluoroscopic images to aid radiotherapy treatment planning and verification. Six Varian TrueBeam units were installed in the Radiotherapy Department at Guy's Cancer Centre in June 2016. The fluoroscopy programmes were tested on three of the units during the commissioning period, and were deemed to be unsuitable for clinical use at that time due to the high skin dose rates and poor image quality. The radiotherapy department planned to use the fluoroscopy mode to observe lung tumour motion by screening the patient for a period of several breathing cycles using a low frame rate and with the beam collimated to the area of interest in the lung. Screening would be performed in AP and LAT orientations prior to the delivery of each radiotherapy fraction. Additional measurements were carried out in March 2017 to investigate the fluoroscopy programmes further, with the eventual aim of bringing these programmes into...