Real-time Motion Management During Prostate and Lung Radiotherapy

This study will assess the feasibility of implementing real-time tracking in a clinical setting to account for the relative motion of the moving tumours localised to the prostate or lung. The capability to track the treatment target's motion will ensure that the dose prescribed by the radiation oncologist is the dose delivered to the target and minimises side effects to the critical organs. During radiation treatment, the target position will be monitored in real-time using built-in imaging technology. The radiation beam shape will be altered to compensate for the moved target positions by the treatment delivery system. The delivered dose to the patient will be calculated after the treatment and compared to the dose without real-time tracking to assess the potential benefit to treatment efficacy, recognising that the radiation dose received by tumour tissue is a very strong biomarker for response. The estimated dose distributions will be compared to the original plan for non-inferiority using the dose reconstruction method based on the prostate motion trajectory and the logged MLC positions (beam shapes). Also, the impact on organs at risk doses due to MLC target tracking.