Patent ID: 7853313

Claim:
A method, comprising: identifying a target in a patient; determining a respiratory motion of the target in the patient; determining a pulsating motion of the target in the patient separately from the determining of the respiratory motion, wherein determining the respiratory motion comprises: detecting a first motion of the target in the patient caused by a combined respiratory and pulsating motion of the patient while the patient breathes during a first period using one or more radiographic images of the target generated during the first period; detecting a second motion of the target in the patient caused substantially only by the pulsating motion while the patient holds a breath during a second period using one or more radiographic images of the target generated during the second period; and calculating the respiratory motion of the target in the patient using the detected first and second motions; and directing a radiosurgical beam, from a radiosurgical beam source, to the target in the patient based on the determining of the pulsating motion and based on the determining of the respiratory motion.