Research project

Evaluation and quality assurance of the Varian Ethos Adaptive Radiotherapy system using deformable dosimetric phantoms

Radiotherapy Physics
Project published
Matt Jones
Training location
The Royal Surrey NHS Foundation Trust

Online adaptive radiotherapy (ART) involves the adaptation of a treatment plan while the patient remains immobilised on the treatment couch. The presence of the patient prohibits performance of pre-treatment delivery quality assurance (QA), which would traditionally be standard practice. The new ART module for the Varian Ethos linear accelerator, which includes a secondary check system to verify adapted treatment dose calculations, is a new and therefore unproven technology.

This research aims to:

  • investigate whether the system adequately and accurately adapts treatment plans to account for clinically-representative anatomical variation, using novel 3D-printed deformable dosimetric phantoms.
  • investigate the net radiobiological benefit of online plan adaptation with respect to existing offline adaptation methods.
  • investigate using such phantoms for quality assurance of the adaptive system in the absence of pre-treatment patient-specific QA, making recommendations for safe and efficient ART workflows.

Last updated on 1st October 2020