IP Library › Granted Patent US 12,251,579
Granted Patent B2
US 12,251,579 · App. 18/163,176 · Granted Mar 18, 2025

Multi-sensor guided radiation therapy

Inventor: Yevgen Voronenko (San Jose, CA)
Assignee: RefleXion Medical, Inc.
A61N5/1067A61N5/1039A61N5/1081A61N2005/1055A61N2005/1059A61N2005/1061A61N2005/1074
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Quick Facts
Patent No.
US 12,251,579
App. No.
18/163,176
Granted
Mar 18, 2025
Kind
B2
Abstract

Disclosed herein are methods for radiotherapy treatment planning and delivery that use sensor data from one or more target sensors. One variation of a radiotherapy treatment planning method comprises generating a sensor characterization image based on a sensor characterization probability density function (PDF) of a target sensor and calculating a set of firing filters that may be applied to sensor images generated from sensor data acquired during a radiation-delivery session. Additionally, a variation of a radiotherapy treatment planning method comprises generating multiple sensor characterization images based on multiple sensor characterization PDF of multiple target sensors and calculating multiple sets of firing filters for each of the multiple target sensors. The firing filters may be used with sensor images generated from target sensor data acquired from one or more target sensors during a radiation-delivery session to calculate a radiation fluence for delivering therapeutic radiation to a target region.

Claims (53)

1. A radiotherapy system comprising:

a patient platform;

a therapeutic radiation source movable to one or more firing positions about the patient platform;

a target sensor system comprising a target sensor that acquires sensor data; and

a controller in communication with the therapeutic radiation source and the target sensor system, wherein the controller is configured to calculate a radiation fluence map for delivery to a target region by convolving an image generated from sensor data with a shift-invariant firing filter derived from a sensor characterization probability density function (PDF) of the target sensor, and wherein the controller is configured to deliver radiation according to the calculated radiation fluence map.

2. The system of claim 1 , wherein the target sensor is a first target sensor and the target sensor system comprises a second target sensor.

3. The system of claim 2 , wherein at least one of the first target sensor and the second target sensor is a position sensor configured to be coupled to a patient disposed on the patient platform.

4. The system of claim 3 , wherein the position sensor is configured to be coupled to a target region.

5. The system of claim 3 , wherein the position sensor comprises an X-ray source and X-ray detector disposed across from the X-ray source configured to detect a position of an implantable fiducial.

6. The system of claim 3 , wherein the position sensor comprises an optical imaging system configured to track an optical fiducial that is attached to a patient's skin, and wherein the target sensor system further comprises an optical camera configured to detect a position of the optical fiducial.

7. The system of claim 2 , wherein the controller is configured to receive a first sensor data reading from the first target sensor and a second sensor data reading from the second target sensor, wherein the shift-invariant firing filter is a first shift-invariant firing filter for the first target sensor, and the sensor characterization PDF is a first sensor characterization PDF for the first target sensor, and wherein the controller is further configured to calculate the fluence map for delivery by summing (a) the convolution of the first sensor data image with the first shift-invariant firing filter, and (b) a convolution of a second image generated from the second sensor data with a second shift-invariant firing filter derived from a second sensor characterization PDF of the second target sensor.

8. The system of claim 7 , wherein the first target sensor is a first type of sensor and the second target sensor is a second type of sensor that is different from the first type.

9. The system of claim 8 , wherein the second target sensor is a position sensor.

10. The system of claim 8 , wherein the first target sensor is a positron annihilation emission path sensor and the second target sensor is a target region position sensor.

11. The system of claim 8 , wherein the first target sensor is an image sensor and the second target sensor is a position sensor.

12. The system of claim 8 , wherein the first target sensor comprises at least one of a 3-D PET sensor, 2-D X-ray sensor, projection image sensor, fluoroscopy image sensor, CT image sensor, and MR sensor, and the second target sensor comprises a position sensor.

13. The system of claim 1 , wherein the sensor characterization PDF is a sensor error characterization PDF that represents a rate of sensor data errors.

14. The system of claim 1 , wherein the sensor characterization PDF represents a rate of sensor data variability.

15. The system of claim 1 , wherein the sensor characterization PDF comprises one or more of: a 1-D plot of sensor data, a 2-D plot of sensor data, and/or a 3-D plot of sensor data, and a histogram representing sensor data variability.

16. The system of claim 3 , wherein the image generated from the position sensor data is a delta function, a gaussian function, and/or a truncated gaussian function that is centered at a location that corresponds to the position sensor data.

17. The system of claim 1 , wherein the target sensor comprises one or more image sensors, the sensor data comprises imaging data, and the sensor characterization PDF of the target sensor comprises an image.

18. The system of claim 17 , wherein the one or more image sensors comprise an image sensor selected from the group consisting of PET sensors, MRI sensors, and CT sensors.

19. A method for radiation delivery, the method comprising:

acquiring a sensor data reading from a target sensor;

generating a sensor image from the sensor data reading;

calculating a radiation fluence map for delivery to a target region by convolving the sensor image with a shift-invariant firing filter derived from a sensor characterization probability density function (PDF) of the target sensor; and

delivering radiation according to the calculated radiation fluence map to the target region.

20. The method of claim 19 , wherein the sensor characterization PDF is a sensor error characterization PDF that represents a rate of sensor data errors.

21. The method of claim 19 , wherein the sensor characterization PDF represents a rate of sensor data variability.

22. The method of claim 21 , wherein the sensor characterization PDF comprises one or more of: a 1-D plot of sensor data, a 2-D plot of sensor data, and/or a 3-D plot of sensor data, and a histogram representing sensor data variability.

23. The method of claim 19 , wherein the target sensor is a position sensor.

24. The method of claim 23 , wherein the sensor image is a delta function, a gaussian function, and/or a truncated gaussian function that is centered at a location that corresponds to the position sensor data reading.

25. The method of claim 24 , wherein the position sensor comprises a target region position sensor.

26. The method of claim 24 , wherein the position sensor comprises an X-ray projector system that is configured to track an implantable fiducial.

27. The method of claim 24 , wherein further comprising attaching an optical fiducial to a patient's skin and tracking the optical fiducial using an optical imaging system.

28. The method of claim 19 , wherein the target sensor is a null position sensor where the sensor data reading is a constant position value that represents a centroid of the target region, and the sensor characterization PDF of the null position sensor comprises a plurality of position values that represent a location of the centroid of the target region over time.

29. The method of claim 28 , wherein the sensor image is a delta function, a gaussian function, and/or a truncated gaussian function that is centered at a location that corresponds to the position sensor data reading.

30. The method of claim 28 , wherein the sensor characterization PDF comprises a motion dwell histogram of the target region.

31. The method of claim 28 , wherein the plurality of position values is determined using 4-D CT imaging data.

32. The method of claim 19 , wherein the shift-invariant firing filter corresponds to a firing position of a therapeutic radiation source and calculating the fluence for delivery comprises calculating a fluence for delivery at the firing position by convolving a projection of the sensor image on the firing position with the shift-invariant firing filter for the firing position.

33. The method of claim 19 , wherein the target sensor comprises one or more image sensors, the sensor data reading comprises imaging data, and the sensor characterization PDF of the target sensor comprises an image generated from the imaging data.

34. The method of claim 33 , wherein the one or more image sensors comprise an image sensor selected from the group consisting of PET sensors, MRI sensors, and CT sensors.

35. The method of claim 19 , wherein the target sensor is a first target sensor, the sensor data reading is a first sensor data reading, the image is a first sensor data image, the shift-invariant firing filter is a first shift-invariant firing filter, and the sensor characterization PDF is a first sensor characterization PDF, and wherein the method further comprises:

acquiring a second sensor data reading from a second target sensor;

generating a second sensor data image from the second sensor data reading; and

wherein calculating the fluence map for delivery comprises summing (a) the convolution of the first sensor data image with the first shift-invariant firing filter, and (b) a convolution of the second sensor data image with a second shift-invariant firing filter derived from a second sensor characterization PDF of the second target sensor.

36. The method of claim 35 , wherein the first target sensor data reading contains a first type of data and the second target sensor data reading contains a second type of data that is different from the first type of data.

37. The method of claim 36 , wherein the second target sensor is a position sensor.

38. The method of claim 36 , wherein the first target sensor data reading comprises positron annihilation emission path data and the second target sensor data reading comprises target region location data.

39. The method of claim 36 , wherein the first target sensor data reading comprises partial imaging data and the second target sensor data reading comprises target region location data.

40. The method of claim 36 , wherein the first target sensor data reading comprises at least one of 3-D PET imaging data, 2-D X-ray imaging data, projection imaging data, fluoroscopy imaging data, CT imaging data, and MR imaging data, and the second target sensor data reading comprises target region location data.

41. The method of claim 35 , wherein the second sensor characterization PDF is a sensor error characterization PDF.

42. The method of claim 19 , wherein the shift-invariant firing filter corresponds to a firing position of a therapeutic radiation source and calculating the fluence for delivery comprises calculating a fluence for delivery at the firing position by projecting the sensor data reading on the firing position, generating a second sensor image of the projected sensor data reading, and convolving the second sensor image with the shift-invariant firing filter for the firing position.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 15, 2023
From: VORONENKO, YEVGEN
To: REFLEXION MEDICAL, INC.
Reel/Frame 062990/0346 →
Continuity (3)
Continuation PCTUS2021044405 · Aug 3, 2021
Provisional Application 63062792 · Aug 7, 2020
Related Publication 20230256266A1 · Aug 17, 2023
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