System and method for radiotherapy field delivery time optimization

Patent metadata

Field	Value
Publication number	US-12070622-B2
Application number	US-202017137222-A
Country	US
Kind code	B2
Filing date	Dec 29, 2020
Priority date	Dec 8, 2020
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

Treatment fields can be produced as part of a treatment plan that achieves a desired balance between field delivery time and dose based on machine parameters and knowledge, such as machine-specific beam production, transport and scanning logic, and/or a maximum treatment time value. The treatment parameters can be adjusted using a graphical user interface so that treatment time or dosimetry is prioritized. As a result, the overall treatment time is reduced, and hence treatment quality and patient experience are improved.

First claim

What is claimed is:

1. A computer-implemented method for radiotherapy treatment planning, the computer-implemented method comprising:
accessing a radiotherapy treatment plan including a plurality of treatment layers, each treatment layer of the plurality of treatment layers including a plurality of spots;
receiving a weight for a treatment time objective of the radiotherapy treatment plan;
modifying a spot from a treatment layer of the plurality of treatment layers based on the weight and a cost of the spot, to produce a modified treatment layer; and
generating a modified radiotherapy treatment plan using the modified treatment layer, wherein the modified radiotherapy treatment plan is operable to be executed by a delivery machine to apply radiotherapy treatment to a target in accordance with the modified radiotherapy treatment plan.

2. The computer-implemented method as described in claim 1 , further comprising:
modifying a plurality of spots of the plurality of treatment layers to produce a plurality of modified treatment layers, wherein said generating the modified radiotherapy treatment plan is performed using the plurality of modified treatment layers.

3. The computer-implemented method as described in claim 1 , wherein said modifying a spot comprises:
removing the spot;
modifying the spot to reduce the cost of the spot; or
redistributing a dose contribution of the spot to one or more neighboring spots.

4. The computer-implemented method as described in claim 1 , further comprising:
receiving a weight for a dosimetric objective of the radiotherapy treatment plan.

5. The computer-implemented method as described in claim 4 , wherein the dosimetric objective comprises:
a dose-volume histogram (DVH) objective;
an equivalent uniform dose (EUD) objective;
a minimum dose objective;
a maximum dose objective; or
a dose fall-off objective.

6. The computer-implemented method as described in claim 4 , further comprising:
dynamically rendering a dose-volume histogram on a graphical user interface of a treatment planning system based on the weight for the treatment time objective of the modified radiotherapy treatment plan and the weight for the dosimetric objective of the radiotherapy treatment plan.

7. The computer-implemented method as described in claim 4 , wherein the weight for the treatment time objective and the weight for the dosimetric objective are defined according to a position of a respective slider rendered on a graphical user interface of a treatment planning system.

8. The computer-implemented method as described in claim 1 , further comprising:
simulating a radiotherapy treatment according to the modified radiotherapy treatment plan to determine if an actual dose, when applied according to the modified radiotherapy treatment plan, will conform with a threshold quality standard for treatment.

9. The computer-implemented method as described in claim 1 , wherein said modifying a spot comprises:
calculating a cost for each spot of the plurality of spots based on a dose associated with the spot and a delivery duration of the spot; and
modifying at least one spot of the plurality of spots having a highest cost.

10. An electronic system for radiotherapy treatment planning, the electronic system comprising:
a display device;
a memory coupled to the display device; and
a processor in communication with the memory, wherein the processor is configured to execute instructions to cause the electronic system to
access a radiotherapy treatment plan including a plurality of treatment layers, each treatment layer of the plurality of treatment layers including a plurality of spots,
assign a weight for a treatment time objective of the radiotherapy treatment plan using input received from a graphical user interface rendered on the display device,
modify a spot from a treatment layer of the plurality of treatment layers based on the weight and a cost of the spot, to produce a modified treatment layer, and
generate a modified radiotherapy treatment plan using the modified treatment layer, wherein the modified radiotherapy treatment plan is operable to be executed by a delivery machine to apply radiotherapy treatment to a target in accordance with the modified radiotherapy treatment plan.

11. The electronic system as described in claim 10 , further comprising:
modifying a plurality of spots of the plurality of treatment layers to produce a plurality of modified treatment layers, wherein said generating the modified radiotherapy treatment plan is performed using the plurality of modified treatment layers.

12. The electronic system as described in claim 10 , wherein modification of the spot includes:
removing the spot;
modifying the spot to reduce the cost of the spot; or
redistributing a dose contribution of the spot to one or more neighboring spots.

13. The electronic system as described in claim 10 , wherein the processor is configured to execute instructions to cause the electronic system to assign a weight for a dosimetric objective of the radiotherapy treatment plan.

14. The electronic system as described in claim 13 , wherein the dosimetric objective includes:
a dose-volume histogram (DVH) objective;
an equivalent uniform dose (EUD) objective;
a minimum dose objective;
a maximum dose objective; or
a dose fall-off objective.

15. The electronic system as described in claim 13 , wherein the processor is configured to execute instructions to cause the electronic system to
dynamically render a dose-volume histogram on the graphical user interface based on the weight for the treatment time objective of the modified radiotherapy treatment plan and the weight for the dosimetric objective of the modified radiotherapy treatment plan.

16. The electronic system as described in claim 13 , wherein the weight for the treatment time objective and the weight for the dosimetric objective are defined according to a position of a respective slider rendered on the graphical user interface.

17. The electronic system as described in claim 10 , wherein the processor is configured to execute instructions to cause the electronic system to
simulate a radiotherapy treatment according to the modified radiotherapy treatment plan to determine if an actual dose, when applied according to the modified radiotherapy treatment plan, will conform with a threshold quality standard.

18. The electronic system as described in claim 10 , wherein modification of the spot comprises:
calculating a cost for each spot of the plurality of spots based on a dose associated with the spot and a delivery duration of the spot; and
modifying at least one spot of the plurality of spots having a highest cost.

19. A non-transitory computer-readable storage medium embodying instructions that, when executed by a processor, cause the processor to perform a method of radiotherapy treatment planning, the method comprising:
accessing a radiotherapy treatment plan including a plurality of treatment layers, each treatment layer of the plurality of treatment layers including a plurality of spots;
assigning a weight for a treatment time objective of the radiotherapy treatment plan based on received inputs;
modifying a spot from a treatment layer of the plurality of treatment layers based on the weight and a cost of the spot to produce a modified treatment layer; and
generating a modified radiotherapy treatment plan using the modified treatment layer, wherein the modified radiotherapy treatment plan is operable to be executed by a delivery mach

Assignees

• Varian Med Sys Inc
• Varian Medical Systems Therapy Gmbh & Co Kg
• Varian Medical Systems Int Ag
• Varian Medical Systems

Inventors

• Meijers Arturs
• Niemela Perttu
• Hytonen Roni
• Van Der Straeten Reynald
• Timmer Jan
• Koponen Timo
• Smith Christel
• HUTH Isabel

Classifications

• A61N5/1043

  Scanning the radiation beam, e.g. spot scanning or raster scanning · CPC title

• A61N5/1071

  for verifying the dose delivered by the treatment plan · CPC title

• A61N2005/1089

  Electrons · CPC title

• A61N5/1037

  taking into account the movement of the target, e.g. 4D-image based planning · CPC title

• A61N2005/1087

  Ions; Protons · CPC title