Systems and methods for generating radiation treatment plan

Patent metadata

Field	Value
Publication number	US-11986673-B2
Application number	US-202117443453-A
Country	US
Kind code	B2
Filing date	Jul 26, 2021
Priority date	May 2, 2018
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

A method for generating a radiation treatment plan is provided. The method may include determining a set of one or more optimization goals for radiation delivery by a therapeutic radiation delivery apparatus. The method may also include determining a plan for radiation delivery from a radiation source of the therapeutic radiation delivery apparatus. The radiation source may be capable of continuously rotating around a subject. The plan may include a plurality of radiation segments. Each radiation segment may be characterized by at least one parameter selected from a start angle, a stop angle, a two-dimensional segment shape, or a segment MU value such that the plurality of radiation segments satisfy the set of one or more optimization goals by superimposing at least two radiation segments from at least two different rotations into a target volume of the subject.

First claim

What is claimed is:

1. A method implemented on at least one machine each of which has at least one processor and at least one storage device for determining a radiation treatment plan, the method comprising:
determining a set of one or more optimization goals for radiation delivery by a therapeutic radiation delivery apparatus;
determining a plurality of radiation segments by iteratively optimizing a dose distribution relative to the set of one or more optimization goals,
the determining the plurality of radiation segments by iteratively optimizing the dose distribution relative to the set of one or more optimization goals comprising:
determining a plurality of sections of a rotational movement of a radiation source of the therapeutic radiation delivery apparatus;
determining the plurality of radiation segments based on the plurality of sections by iteratively optimizing a dose distribution relative to the set of one or more optimization goals, comprising:
for each section, determining a fluence map by iteratively optimizing the dose distribution relative to the set of one or more optimization goals, the fluence map corresponding to a plurality of angles within an angle range of the each section;
decomposing the plurality of fluence maps;
determining the plurality of radiation segments based on the plurality of decomposed fluence maps; or

the determining the plurality of radiation segments by iteratively optimizing the dose distribution relative to the set of one or more optimization goals comprising:
determining, based on the plurality of sections, the plurality of radiation segments by optimizing, according to direct aperture optimization, angle ranges, segment shapes, and segment MU values of the plurality of radiation segments in an iterative optimizing operation;

determining a sequence of the plurality of radiation segments for radiation delivery to obtain a delivery trajectory of the radiation source of the therapeutic radiation delivery apparatus;
determining a radiation treatment plan based on the plurality of sequential radiation segments for radiation delivery and the delivery trajectory of the radiation source of the therapeutic radiation delivery apparatus; and
delivering a radiation beam to a target volume based on the radiation treatment plan.

2. The method of claim 1 , wherein determining a plurality of sections comprises:
segmenting a rotation range of the rotational movement randomly or uniformly to obtain the plurality of sections.

3. The method of claim 1 , wherein determining a plurality of sections comprises:
segmenting a rotation range of the rotational movement based on one or more constraints associated with the therapeutic radiation delivery apparatus to obtain the plurality of sections.

4. The method of claim 1 , wherein determining a plurality of sections comprises:
segmenting a rotation range of the rotational movement based on the set of one or more optimization goals to obtain the plurality of sections.

5. The method of claim 1 , wherein determining a plurality of radiation segments by iteratively optimizing a dose distribution relative to the set of one or more optimization goals comprises:
determining a segment count of the plurality of radiation segments, an angle range of each of the plurality of radiation segments, one or more segment shapes of each of the plurality of radiation segments, one or more segment MU rates of each of the plurality of radiation segments, and/or one or more segment MU values of each of the plurality of radiation segments.

6. The method of claim 1 , wherein iteratively optimizing a dose distribution relative to the set of one or more optimization goals comprises:
iteratively optimizing the dose distribution relative to the set of one or more optimization goals based on one or more constraints associated with the therapeutic radiation delivery apparatus.

7. The method of claim 1 , wherein determining a sequence of the plurality of radiation segments for radiation delivery to obtain a delivery trajectory of a radiation source of the therapeutic radiation delivery apparatus comprises:
determining the sequence of the plurality of radiation segments based on the plurality of radiation segments and one or more constraints associated with the therapeutic radiation delivery apparatus.

8. The method of claim 1 , wherein iteratively optimizing a dose distribution relative to the set of one or more optimization goals comprises:
in at least one iteration,
determining a plurality of sub-segments of at least one radiation segment of the plurality of radiation segments based on one or more control points;
determining a collimator angle of an MLC of the therapeutic radiation delivery apparatus and a segment shape for each control point of the one or more control points; and
determining an MU value for each sub-segment of the plurality of sub-segments;
iteratively optimizing the dose distribution relative to the set of one or more optimization goals based on the plurality of sub-segments and the plurality of radiation segments excluding the at least one radiation segment.

9. The method of claim 1 , wherein the delivery trajectory includes a plurality of rotations.

10. The method of claim 9 , wherein at least one portion of a segment MU value of a radiation segment of the plurality of radiation segments is distributed in at least two rotations of the plurality of rotations.

11. The method of claim 9 , wherein a first rotation of the plurality of rotations includes one or more first radiation segments, a second rotation of the plurality of rotations includes one or more second radiation segments.

12. The method of claim 11 , wherein at least one first radiation segment of the first rotation is different from at least one second radiation segment of the second rotation.

13. The method of claim 11 , wherein one of the one or more first radiation segments and one of the one or more second radiation segments have a same angle range, a same segment shape, a same segment MU rate, and/or a same segment MU value.

14. The method of claim 1 , further comprising:
obtaining one or more imaging protocols that are to be executed during radiation therapy, an execution interval of the one or more imaging protocols, and/or an execution sequence of the one or more imaging protocols, and iteratively optimizing a dose distribution relative to the set of one or more optimization goals comprises:
iteratively optimizing the dose distribution relative to the set of one or more optimization goals based on one or more constraints associated with the therapeutic radiation delivery apparatus and the one or more imaging protocols.

15. The method of claim 14 , further comprising:
adjusting the radiation treatment plan based on the one or more imaging protocols by at least one of
adjusting an angle range of a radiation segment,
adjusting a segment shape of a radiation segment,
adjusting a segment MU value of a radiation segment,
adjusting a segment MU rate of a radiation segment,
adjusting a sub-segment of a radiation segment,
adjusting the sequence of the plurality of radiation segments and/or a plurality of sub-segments of the plurality of radiation segments,
increasing a time for radiation therapy,
delaying a time for radiation delivery in a radiation segment,
adding an imaging plan associated with the one or more imaging protocols to the radiation treatment plan, or
adding one or more rotations including no radiation delivery between a first radiation segment of the plurality of radiation segments and a second radiation segment of the plurality of r

Assignees

• Shanghai United Imaging Healthcare Co Ltd

Inventors

• Zhou Jingjie
• Wang Li
• Ni Cheng
• Stahl Johannes
• Maltz Jonathan

Classifications

• A61N5/1047 Primary

  with movement of the radiation head during application of radiation, e.g. for intensity modulated arc therapy or IMAT · CPC title

• A61N5/1031

  using a specific method of dose optimization · CPC title

• A61N5/1045

  using a multi-leaf collimator, e.g. for intensity modulated radiation therapy or IMRT · CPC title

• A61N5/1081

  Rotating beam systems with a specific mechanical construction, e.g. gantries · CPC title

• A61N2005/1032

  Genetic optimization methods · CPC title