Apparatus and method for radiosurgery
First Claim
1. 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.
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Abstract
A method and system is presented for treating moving target regions in a patient'"'"'s anatomy by creating radiosurgical lesions. The method includes determining a pulsating motion of a patient separately from a determining of a respiratory motion, and directing a radiosurgical beam, from a radiosurgical beam source, to a target in the patient based on the determining of the pulsating motion. Directing the radiosurgical beam to the target may include creating a lesion in the heart to inhibit atrial fibrillation. The method may further include determining the respiratory motion of the patient, and compensating for movement of the target, due to the respiratory motion and the pulsating motion of the patient, in the directing of the radiosurgical beam based on the determining of the respiratory motion and the determining of the pulsating motion.
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Citations
35 Claims
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1. A method, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A system, comprising:
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an imaging device configured to acquire an image of a target in a patient; a pulsation measurement device configured to detect a pulsating cycle of the target in the patient; a radiosurgical beam source configured to direct a radiosurgical beam, from the radiosurgical beam source, to the target in the patient; and a controller coupled to the radiosurgical beam source and the pulsation measurement device, wherein the controller is configured to identify the target in the image, to receive a signal from the pulsation measurement device representative of the pulsating cycle, and to determine a pulsating motion of the target in the patient based on the pulsating cycle, wherein the controller is configured to detect a first motion of the target caused by a combined respiratory and pulsating motion while the patient breathes during a first period using a plurality of images of the target acquired during the first period, and a second motion of the target caused substantially only by the pulsating motion during a second period using a plurality of images of the target acquired during the second period, and wherein the controller is configured to calculate a respiratory motion of the target in the patient using the first and second motions, and wherein the controller is configured to position the radiosurgical beam source to direct the radiosurgical beam to compensate for the first motion of the target caused by the combined respiratory and pulsating motion using the second motion and the calculated respiratory motion. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification