System and method for motion adaptive optimization for radiation therapy delivery

• US 8,509,383 B2
• Filed: 10/27/2008
• Issued: 08/13/2013
• Est. Priority Date: 10/25/2007
• Status: Active Grant

• Current Assignee: TomoTherapy Incorporated (Accuray Incorporated)
• Original Assignee: TomoTherapy Incorporated (Accuray Incorporated)
• Inventors: Lu, Weiguo, Chen, Mingli, Chen, Quan, Ruchala, Kenneth J., Olivera, Gustavo H.
• Primary Examiner(s): Midkiff, Anastasia
• Application Number:
  US12/259,038
• Publication Number:
  US 20090116616A1
• Time in Patent Office: 1,751 Days
• Field of Search: 378/65, 378 4- 20, 378/37, 378/64, 378/68, 378/69, 378/91, 378 95- 97, 378/108, 378/165, 600425-429
• US Class Current: 378/65
• CPC Class Codes: A61N 5/1037 taking into account the movement of the target, e.g. 4D-image based planning
• CPC Class Codes: A61N 5/1049 for verifying the position of the patient with respect to the radiation beam
• CPC Class Codes: A61N 5/1067 in real time, i.e. during treatment

Abstract

A system and method of optimizing delivery of a radiation therapy treatment. The system optimizes treatment delivery in real-time to take into account a variety of factors, such as patient anatomical and physiological changes (e.g., respiration and other movement, etc.), and machine configuration changes (e.g., beam output factors, couch error, leaf error, etc.).

Claims

1. A method of delivering a radiation therapy treatment, the method comprising:

generating a treatment plan for a patient, the treatment plan specifying a beam intensity and including a plurality of projections;

positioning the patient to receive radiation from a radiation source based on the treatment plan;

acquiring information related to the radiation dose being delivered to the patient while the radiation source is delivering at least one of the plurality of projections;

while the radiation source is delivering at least one of the plurality of projections to the patient, modifying at least one of the plurality of projections yet to be delivered to the patient using the information related to the radiation dose being delivered and incorporating real-time changes to the patient; and

delivering at least one of the modified projections to the patient.

2. The method of delivering a radiation therapy treatment of claim 1 further comprising detecting a change in configuration of the patient during delivery of one of the projections.

3. The method of delivering a radiation therapy treatment of claim 2 further comprising accumulating an amount of radiation dose delivered to the patient through one of the projections.

4. The method of delivering a radiation therapy treatment of claim 3 wherein accumulating the amount of radiation dose delivered to the patient through one of the projections includes using dose calculations on a 4D representation of the patient.

5. The method of delivering a radiation therapy treatment of claim 3 wherein accumulating the amount of radiation dose delivered to the patient through one of the projections includes using in vivo dosimetry to measure delivered dose.

6. The method of delivering a radiation therapy treatment of claim 3 further comprising estimating an amount of radiation dose to be delivered to the patient in a subsequent one of the projections.

7. The method of delivering a radiation therapy treatment of claim 6 further comprising predicting a change in configuration of the patient for the subsequent projection.

8. The method of delivering a radiation therapy treatment of claim 7 wherein the change in configuration of the patient includes a change in position of the target.

9. The method of delivering a radiation therapy treatment of claim 7 further comprising adjusting the treatment plan based on the estimated amount of radiation dose to be delivered to the patient in the subsequent projection and the predicted position of the target during the subsequent projection.

10. The method of delivering a radiation therapy treatment of claim 1 wherein changes to the patient include motion of a target within the patient.

11. The method of delivering a radiation therapy treatment of claim 1 wherein changes to the patient include deformation of a target within the patient.

12. The method of delivering a radiation therapy treatment of claim 1 wherein changes to the patient include motion of a sensitive structure within the patient.

13. The method of delivering a radiation therapy treatment of claim 1 wherein changes to the patient include deformation of a sensitive structure within the patient.

14. The method of delivering a radiation therapy treatment of claim 1 wherein modifying at least one of the plurality of projections yet to be delivered to the patient includes modifying an amount of radiation dose to be delivered in one of the yet to be delivered projections to compensate for accumulated delivery errors that occurred in one of the previously delivered projections.

15. The method of delivering a radiation therapy treatment of claim 14 wherein the accumulated delivery errors are based on the accumulated radiation dose from one of the previously delivered projections, an estimated radiation dose to be delivered in one of the yet to be delivered projections, and a predicted configuration of the patient during one of the yet to be delivered projections.

16. The method of delivering a radiation therapy treatment of claim 15 wherein the accumulated delivery errors include delivery errors from previous fractions.

17. The method of delivering a radiation therapy treatment of claim 1 wherein modifying at least one of the plurality of projections yet to be delivered to the patient includes incorporating changes to one of the projections via a negative feedback loop.

18. The method of delivering a radiation therapy treatment of claim 1 wherein modifying at least one of the plurality of projections yet to be delivered to the patient to incorporate changes to machine configuration includes adjusting a pattern of a multi-leaf collimator supported by a radiation delivery system.

19. The method of delivering a radiation therapy treatment of claim 1 wherein modifying at least one of the plurality of projections yet to be delivered to the patient to incorporate changes to machine configuration includes adjusting a velocity of a couch of a radiation delivery system.

20. A method of delivering a radiation therapy treatment, the method comprising:

generating a radiation therapy treatment plan for a patient, the treatment plan including a plurality of projections, each projection specifying an amount of radiation dose to be delivered to the patient based on a predetermined position of a target within the patient;

monitoring the position of the target in the patient while a radiation source is active and delivering the radiation dose of at least one of the plurality of projections;

modifying the radiation therapy treatment plan while the radiation source is active and delivering the radiation dose of at least one of the plurality of projections to compensate for a position of the target different than the predetermined position; and

after modifying the radiation therapy treatment plan, substantially maintaining the amount of radiation dose to be delivered to the patient according to the radiation therapy treatment plan.

21. The method of delivering a radiation therapy treatment of claim 20 wherein generating the treatment plan for the patient includes generating a treatment objective for the patient.

22. The method of delivering a radiation therapy treatment of claim 21 wherein the treatment objective includes tumor control probability and wherein substantially maintaining the amount of radiation dose to be delivered to the patient includes analyzing whether the treatment objective is satisfied.

23. The method of delivering a radiation therapy treatment of claim 21 wherein the treatment objective includes normal tissue compensation probability and wherein substantially maintaining the amount of radiation dose to be delivered to the patient includes analyzing whether the treatment objective is satisfied.

24. The method of delivering a radiation therapy treatment of claim 20 further comprising detecting a position of a target in the patient during delivery of one of the projections.

25. The method of delivering a radiation therapy treatment of claim 24 further comprising accumulating an amount of radiation dose delivered to the patient through one of the projections.

26. The method of delivering a radiation therapy treatment of claim 25 wherein accumulating the amount of radiation dose delivered to the patient through the first projection includes using dose calculations on a 4D representation of the patient.

27. The method of delivering a radiation therapy treatment of claim 25 wherein accumulating the amount of radiation dose delivered to the patient through one of the projections includes using in vivo dosimetry to measure delivered dose.

28. The method of delivering a radiation therapy treatment of claim 25 further comprising estimating an amount of radiation dose to be delivered to the patient in a subsequent one of the projections.

29. The method of delivering a radiation therapy treatment of claim 28 further comprising predicting a change in configuration of the patient for the subsequent one of the projections.

30. The method of delivering a radiation therapy treatment of claim 29 wherein the change in configuration of the patient includes a change in position of the target.

31. The method of delivering a radiation therapy treatment of claim 29 further comprising adjusting the treatment plan based on the estimated amount of radiation dose to be delivered to the patient in the subsequent one of the projections and the predicted position of the target during the subsequent one of the projections.

32. The method of delivering a radiation therapy treatment of claim 20 wherein monitoring the position of the target includes monitoring motion of the target within the patient.

33. The method of delivering a radiation therapy treatment of claim 20 wherein monitoring the position of the target includes detecting deformation of the target within the patient.

34. The method of delivering a radiation therapy treatment of claim 20 wherein monitoring the position of the target includes monitoring motion of a sensitive structure within the patient.

35. The method of delivering a radiation therapy treatment of claim 20 wherein monitoring the position of the target includes detecting deformation of a sensitive structure within the patient.

36. The method of delivering a radiation therapy treatment of claim 20 wherein modifying the radiation therapy treatment plan includes optimizing at least one of the plurality of projections yet to be delivered to the patient.

37. The method of delivering a radiation therapy treatment of claim 20 wherein modifying the radiation therapy treatment plan includes modifying an amount of radiation dose to be delivered in one of the projections yet to be delivered to the patient to compensate for accumulated delivery errors that occurred in one of the projections previously delivered to the patient.

38. The method of delivering a radiation therapy treatment of claim 37 wherein the accumulated delivery errors are based on the accumulated radiation dose from previously delivered projections, an estimated radiation dose to be delivered in one of the yet to be delivered projections, and a predicted configuration of the patient during one of the yet to be delivered projections.

39. The method of delivering a radiation therapy treatment of claim 38 wherein the accumulated delivery errors include delivery errors from previous fractions.

40. The method of delivering a radiation therapy treatment of claim 20 wherein modifying the radiation therapy treatment plan includes incorporating changes to the treatment plan via a negative feedback loop.

41. The method of delivering a radiation therapy treatment of claim 20 wherein modifying the radiation therapy treatment plan includes incorporating changes to a machine configuration to adjust a pattern of a multi-leaf collimator supported by a radiation delivery system.

42. The method of delivering a radiation therapy treatment of claim 20 wherein modifying the radiation therapy treatment plan includes incorporating changes to a machine configuration to adjust a velocity of a couch of a radiation delivery system.

43. The method of delivering a radiation therapy treatment of claim 20 wherein modifying the radiation therapy treatment plan includes incorporating changes to a machine configuration to adjust one of a position of a couch, an angle of a gantry, a velocity of a gantry, and output of a linac, the couch, gantry, and linac supported by a radiation delivery system.

44. The method of delivering a radiation therapy treatment of claim 20 wherein each of the plurality of projections define a time period.

45. The method of delivering a radiation therapy treatment of claim 44 wherein generating the treatment plan for the patient includes adjusting the time period of each projection beyond a total time period of all projections established in the treatment plan.

46. A radiation delivery system for delivering a radiation therapy treatment, the radiation delivery system comprising:

a computer processor; and

a software program stored in a computer readable medium accessible by the computer processor, the software being operable to

generate a treatment plan for a patient, the treatment plan specifying a beam intensity and including a plurality of projections;

position the patient to receive radiation from a radiation source based on the treatment plan;

acquire information related to the radiation dose being delivered to the patient while the radiation source is delivering at least one of the plurality of projections;

while the radiation source is delivering at least one of the plurality of projections to the patient, modify at least one of the plurality of projections yet to be delivered to the patient using the information related to the radiation dose being delivered and to incorporate real-time changes to the patient; and

deliver at least one of the modified projections to the patient.

47. A computer program embodied by a computer readable medium capable of being executed by a computer, the computer program for use in a radiation delivery system, the computer program comprising:

a treatment plan module operable to generate a treatment plan for a patient, the treatment plan specifying a beam intensity and including a plurality of projections;

a position module operable to position the patient with respect to a radiation source of the radiation delivery system;

an optimization module operable to acquire information related to the radiation dose being delivered to the patient while the radiation source is delivering at least one of the plurality of projections and to modify at least one of the plurality of projections yet to be delivered to the patient using the information related to the radiation dose being delivered and to incorporate real-time changes to the patient; and

a treatment delivery module operable to deliver at least one of the modified projections to the patient.