Rigid phantom for end-to-end verification of adaptive radiotherapy systems

A method comprising:

• imaging a first target on a phantom to provide a first image;
• adjusting a configuration of the phantom to align a second target associated with the phantom with the adaptive radiotherapy system, the first target having a known geometric relationship to the second target;
• imaging the second target on the phantom to provide a second image;
• creating a radiotherapy treatment plan for the adaptive radiotherapy system from one of the first image and the second image;
• determining an expected dose for the radiotherapy treatment plan when applied to one of the first target and the second target;
• applying the radiotherapy plan to one of the first target and the second target to provide a dosage measurement at a dosimeter associated with the phantom;
• and
• evaluating a performance of the adaptive radiotherapy system according to the expected dose, the dosage measurement, and according to the known geometric relationship between the first target and the second target to provide a metric representing the performance of the radiotherapy system.