Treatment Delivery
At the treatment machine, patients are set up under OSMS. The AlignRT system automatically acquires the ROI of the patient surface and registers it to the reference to calculate real-time deltas. The set-up is considered acceptable if the real-time deltas of the current breath-hold ROI surface to the planned surface are within predetermined tolerances. Cone beam computed tomography is performed to verify the internal target matches. During treatment, the patient is instructed to take a deep breath and hold it, and the radiation beam is turned on automatically while the patient is holding their breath and real-time deltas within predetermined tolerances (6-dimensional translation and rotation errors of 3 mm and 3°). Cone beam computed tomography is performed at least for the first 3 fractions, then once a week.