System and method for dynamic strobe arc therapy

• US 8,027,431 B2
• Filed: 08/18/2009
• Issued: 09/27/2011
• Est. Priority Date: 06/23/2009
• Status: Active Grant

• Current Assignee: Siemens Medical Solutions USA Incorporated (Siemens AG)
• Original Assignee: Siemens Medical Solutions USA Incorporated (Siemens AG)
• Inventors: Stahl, Johannes N., Shukla, Himanshu P.
• Primary Examiner(s): Midkiff; Anastasia
• Application Number:
  US12/543,437
• Publication Number:
  US 20100322381A1
• Time in Patent Office: 770 Days
• Field of Search: 378/64, 378/65, 378/68, 378/91, 378/96, 378/97, 378/106, 378/108, 378/210, 600427-429, 250/492.1
• US Class Current: 378/65
• CPC Class Codes: A61N 5/103 Treatment planning systems
• CPC Class Codes: A61N 5/1042 with spatial modulation of the radiation beam within the treatment head
• CPC Class Codes: A61N 5/1047 with movement of the radiation head during application of radiation, e.g. for intensity modulated arc therapy or IMAT

Abstract

Some embodiments include receiving a radiation treatment plan for delivering at least a portion of a prescribed radiation dose to a target volume in a series of individual treatment beams, each individual treatment beam defined by a segment including start angle and a stop angle, and delivering a portion of the prescribed radiation dose to the target volume over each of the segments, the segments arranged in a contiguous manner on an arc.

Claims

1. A method comprising:

receiving a radiation treatment plan for a prescribed radiation dose to a target volume in a series of individual treatment beams in an arc around the target volume, each individual beam being associated with a fixed point and a prescribed dose of radiation for each fixed point;

converting each fixed point associated with each of the individual treatment beams to a segment having a start angle and a stop angle where the start angle is not equal to the stop angle, each segment defining a range over which the prescribed dose of radiation corresponding to each fixed point is to be delivered, and the segments arranged in a contiguous manner on the arc; and

delivering, by a radiation therapy system including a gantry to control a position of a radiation source, the prescribed dose of radiation from the radiation source to the target volume over each of the segments arranged in the contiguous manner on the arc, the delivery of the prescribed radiation dose is continuous through each of the segments between the start angle and the stop angle of each segment and the gantry of the radiation therapy system moves in a continuous motion about the target volume throughout the delivery of the prescribed dose of radiation to the target volume over each of the segments.

2. The method of claim 1, wherein the fixed points associated with the series of individual treatment beams are spaced apart from each other.

3. The method of claim 1, wherein the treatment plan is created in accordance with a Direct Aperture Optimization algorithm.

4. The method of claim 1, wherein a shape and dose of each of the treatment beams is optimized by a treatment planning system.

5. The method of claim 1, wherein each segment is further defined by a beam shape, a beam dose, and a beam energy.

6. The method of claim 5, wherein the beam shape is verified prior to each segment delivery.

7. The method of claim 5, wherein the beam dose for each segment is delivered between the start angle and the stop angle.

8. The method of claim 7, wherein the beam dose is distributed between the start angle and the stop angle at a maximum dose rate centered at about a mid-point between the start angle and the stop angle.

9. The method of claim 7, wherein the beam dose is distributed substantially equally between the start angle and the stop angle.

10. The method of claim 1, wherein the start angle and the stop angle for at least one of the segments coincide with each other.

11. The method of claim 1, further organizing the segments to reduce a time to provide the delivering of the portion of the prescribed radiation dose.

13. The system of claim 11, wherein the fixed points associated with the series of individual treatment beams are spaced apart from each other.

12. A system comprising:

a memory to store a radiation treatment plan for delivering at least a portion of a prescribed radiation dose to a target volume in a series of individual treatment beams in an arc around the target volume, each individual treatment beam being associated with a fixed point and a prescribed dose of radiation for each fixed point;

converting each fixed point associated with each of the individual treatment beams to a segment having a start angle and a stop angle where the start angle is not equal to the stop angle, each segment defining a range over which the prescribed dose of radiation corresponding to each fixed point is to be delivered, and the segments arranged in a contiguous manner on the arc; and

a radiation therapy system including a gantry to control a position of a radiation source and a processor in communication with the memory, the processor being operable to cause;

delivering, by the radiation therapy system, the prescribed dose of radiation from the radiation source to the target volume over each of the segments arranged in the contiguous manner on the arc and the delivery of the prescribed radiation dose is continuous through each of the segments between the start angle and the stop angle and the gantry of the radiation therapy system moves in a continuous motion about the target volume throughout the delivery of the prescribed dose of radiation to the target volume over each of the segments.

14. The system of claim 12, wherein a shape and dose of each of the treatment beams is optimized by the treatment planning system.

15. The system of claim 12, wherein each segment is further defined by a beam shape, a beam dose, and a beam energy.

16. The system of claim 15, wherein the beam shape is verified prior to each segment delivery.

17. The system of claim 15, wherein the beam dose for each segment is delivered between the start angle and the stop angle.

18. The system of claim 17, wherein the beam dose is distributed between the start angle and the stop angle at a maximum dose rate centered at about a mid-point between the start angle and the stop angle.

19. The system of claim 17, wherein the beam dose is distributed substantially equally between the start angle and the stop angle.

20. The system of claim 12, wherein the start angle and the stop angle for at least one of the segments coincide with each other.

21. The system of claim 12, further organizing the segments to reduce a time to provide the delivering of the portion of the prescribed radiation dose to the target volume.

22. A medium having processor-executable instructions stored thereon, the medium comprising:

instructions for receiving a radiation treatment plan for a prescribed radiation dose to a target volume in a series of individual treatment beams in an arc around the target volume, each individual beam being associated with a fixed point and a prescribed dose of radiation for each fixed point;

instructions for converting each fixed point associated with each of the individual treatment beams a segment having a start angle and a stop angle where the start angle is not equal to the stop angle, each segment defining a range over which the prescribed dose of radiation corresponding to each fixed point is to be delivered, and the segments arranged in a contiguous manner on the arc; and

instructions for delivering, by a radiation therapy system including a gantry to control a position of a radiation source, the prescribed dose of radiation from the radiation source to the target volume over each of the segments arranged in the contiguous manner on the arc and the delivery of the prescribed radiation dose is continuous through each of the segments between the start angle and the stop angle of each segment and the gantry of the radiation therapy system moves in a continuous motion about the target volume throughout the delivery of the prescribed dose of radiation to the target volume over each of the segments.

23. The medium of claim 22, wherein each segment is further defined by a beam shape, a beam dose, and a beam energy.

24. The medium of claim 23, wherein the beam shape is verified prior to each segment delivery.

25. The medium of claim 23, wherein the beam dose for each segment is delivered between the start angle and the stop angle.

26. The medium of claim 25, wherein the beam dose is distributed between the start angle and the stop angle at a maximum dose rate centered at about a mid-point between the start angle and the stop angle.

27. The medium of claim 25, wherein the beam dose is distributed substantially equally between the start angle and the stop angle.

28. The medium of claim 22, further organizing the segments to reduce a time to provide the delivering of the portion of the prescribed radiation dose to the target volume.