Method of and system for predicting dose delivery

A method of determining a radiation dose to be delivered to a patient, the method comprising:

• generating a treatment plan for the patient;
• acquiring a volumetric image of at least a portion of the patient while the patient is substantially in the treatment position;
• calculating using a computer a plurality of doses that would be delivered to the patient for each of a plurality of patient profiles, each patient profile including the acquired image;
• and
• selecting one of the patient profiles for delivery of the treatment plan.

A method of determining a radiation dose to be delivered to a patient, the method comprising:

• delivering radiation to a patient according to a predetermined treatment plan;
• acquiring a volumetric image of at least a portion of the patient during delivery of the radiation;
• calculating using a computer a radiation dose while the radiation is being delivered, the radiation dose based on at least in part on the acquired image;
• and
• determining whether to modify delivery of the radiation while the radiation is being delivered.