A SYSTEM AND A METHOD FOR VERIFYING A TREATMENT PLAN

• US 20180200537A1
• Filed: 06/14/2016
• Published: 07/19/2018
• Est. Priority Date: 07/08/2015
• Status: Active Grant

• Current Assignee: ScandiDos AB
• Original Assignee: ScandiDos AB
• Inventors: Gustafsson, Anders, Matzen, Thomas, Bangtsson, Erik
• Granted Patent: US 10,610,703 B2
• Time in Patent Office: Days
• CPC Class Codes: A61N 2005/1076 using a dummy object placed in the radiation field, e.g. phantom
• CPC Class Codes: A61N 5/1071 for verifying the dose delivered by the treatment plan
• CPC Class Codes: A61N 5/1075 for testing, calibrating, or quality assurance of the radiation treatment apparatus

Abstract

The present invention relates to a method for determining an energy fluence correction in a quality assurance system for a radiation therapy apparatus, which method comprises receiving a treatment plan description; generating a set of measured phantom dose values; generating a set of determined phantom dose values, by determining phantom dose values on basis of at least the treatment plan description and a phantom description; determining a set of phantom dose corrections on basis of at least the set of determined phantom dose values and the set of measured phantom dose values; and determining an energy fluence correction on basis of at least the set of phantom dose corrections. It further relates to a method for determining a reconstructed patient dose distribution on basis of at least the energy fluence correction, a patient description, and further data related to the treatment plan description. It also relates to corresponding quality assurance and control systems.

Claims

1-15. -15. (canceled)

16. A method for determining an energy fluence correction in a quality assurance system for a radiation therapy apparatus, comprising:

receiving a treatment plan description;

generating a set of measured phantom dose values;

generating a set of determined phantom dose values by determining phantom dose values on basis of at least the treatment plan description and a phantom description;

determining a set of phantom dose corrections on basis of at least the set of determined phantom dose values and the set of measured phantom dose values; and

determining the energy fluence correction on basis of at least the set of phantom dose corrections.

17. The method according to 16, further comprising:

receiving, at the quality assurance system, a set of treatment planning system phantom dose values, determined by a treatment planning system, wherein said determining the set of phantom dose corrections is further based on the set of treatment planning system phantom dose values.

18. The method according to claim 17, wherein said determining the set of phantom dose corrections comprises:

determining a first set of phantom dose differences on basis of the set of determined phantom dose values and the set of measured phantom dose values;

determining a second set of phantom dose differences on basis of the set of determined phantom dose values and the set of treatment planning system phantom dose values; and

combining the first set of phantom dose differences with the second set of phantom dose differences.

19. The method according to claim 18, wherein said generating the set of determined phantom dose values comprises:

determining an energy fluence on basis of the treatment plan description, wherein said determination of the phantom dose values is based on the energy fluence.

20. The method according to claim 18, wherein the energy fluence correction is generated by means of an inverse dose calculation.

21. The method according to claim 17, wherein said generating the set of determined phantom dose values comprises:

determining an energy fluence on basis of the treatment plan description, wherein said determination of the phantom dose values is based on the energy fluence.

22. The method according to claim 17, wherein the energy fluence correction is generated by means of an inverse dose calculation.

23. The method according to claim 16, wherein said generating the set of determined phantom dose values comprises:

determining an energy fluence on basis of the treatment plan description, wherein said determination of the phantom dose values is based on the energy fluence.

24. The method according to claim 16, wherein the energy fluence correction is generated by means of an inverse dose calculation.

25. A method for determining a reconstructed patient dose distribution comprising:

determining an energy fluence correction in a quality assurance system for a radiation therapy apparatus comprising;

receiving a treatment plan description,

generating a set of measured phantom dose values,

generating a set of determined phantom dose values, by determining phantom dose values on basis of at least the treatment plan description and a phantom description,

determining a set of phantom dose corrections on basis of at least the set of determined phantom dose values and the set of measured phantom dose values, and

determining the energy fluence correction on basis of at least the set of phantom dose corrections;

and

determining the reconstructed patient dose distribution on basis of at least the energy fluence correction, a patient description, and further data related to the treatment plan description.

26. The method according to claim 25, wherein said determining the reconstructed patient dose distribution comprises:

determining an energy fluence on basis of said treatment plan description, wherein said further data related to the treatment plan description comprises the energy fluence.

27. The method according to claim 26, wherein said determining a reconstructed patient dose distribution comprises:

determining a corrected energy fluence by means of the energy fluence correction and the energy fluence; and

determining the reconstructed patient dose distribution by means of the corrected energy fluence and the patient description.

28. The method according to claim 26, wherein said determining the reconstructed patient dose distribution comprising:

determining a patient dose distribution on basis of the energy fluence and the patient description, wherein said further data related to the treatment plan description comprises the patient dose distribution;

determining a set of patient dose corrections on basis of the energy fluence correction and the patient description;

determining a set of relative patient dose corrections on basis of the patient dose distribution and a set of patient dose corrections;

receiving a treatment planning system patient dose distribution, wherein said further data related to the treatment plan description comprises the treatment planning system patient dose distribution; and

determining the reconstructed patient dose distribution on basis of the set of relative patient dose corrections.

29. The method according to claim 28, wherein the set of patient dose corrections constitutes a dose correction distribution in a patient geometry, the patient dose distribution constitutes an ideal dose distribution in the patient geometry, and the set of relative patient dose corrections constitutes a relative dose correction in a patient volume.

30. The method according to claim 28, wherein said determining the reconstructed patient dose distribution comprises:

determining the set of patient dose corrections on basis of at least the energy fluence correction and the patient description;

receiving said further data related to the treatment plan description in the form of a treatment planning system patient dose distribution; and

determining the reconstructed patient dose distribution on basis of at least the treatment planning system patient dose distribution and the set of patient dose corrections.

31. A quality assurance system for a radiation therapy treatment apparatus, comprising:

a phantom to simulate a radiation therapy treatment, wherein the phantom is provided with radiation detectors; and

a computing device comprising;

a measuring module connected with the radiation detectors, wherein the measuring module is configured to generate a set of measured phantom dose values,

an input data device, wherein the input data device is configured to receive a treatment plan description, and

an output data device;

wherein the computing device is configured to;

generate a set of determined phantom dose values by determining phantom dose values on basis of at least the treatment plan description and a phantom description;

determine a set of phantom dose corrections on basis of at least the set of determined phantom dose values and the set of measured phantom dose values; and

determine an energy fluence correction on basis of at least the set of phantom dose corrections.

32. The quality assurance system according to claim 31, wherein the computing device is configured to determine a reconstructed patient dose distribution on basis of at least the energy fluence correction, a patient description, and further data related to the treatment plan description;

and wherein the output data device is configured to output the reconstructed patient dose distribution.