Systems and methods for fiducial to plan association

• US 9,919,165 B2
• Filed: 05/07/2014
• Issued: 03/20/2018
• Est. Priority Date: 05/07/2014
• Status: Active Grant

• Current Assignee: Varian Medical Systems Incorporated (Siemens AG)
• Original Assignee: Varian Medical Systems Incorporated (Siemens AG)
• Inventors: Vertatschitsch, Edward, Kraft, Raymond, Schumm, Joseph, Morgan, Andrea
• Primary Examiner(s): CHAO, ELMER M
• Application Number:
  US14/272,384
• Publication Number:
  US 20150320358A1
• Time in Patent Office: 1,413 Days
• CPC Class Codes: A61B 5/062 using magnetic field
• CPC Class Codes: A61B 5/1114 Tracking parts of the body
• CPC Class Codes: A61B 5/4887 Locating particular structures in or on the body
• CPC Class Codes: A61N 2005/1051 using an active marker
• CPC Class Codes: A61N 5/1037 taking into account the movement of the target, e.g. 4D-image based planning
• CPC Class Codes: A61N 5/1038 taking into account previously administered plans applied to the same patient, i.e. adaptive radiotherapy
• CPC Class Codes: A61N 5/1067 in real time, i.e. during treatment

Abstract

Various embodiments disclose systems and methods for tracking regions (e.g., tumor locations) within living organisms. Some embodiments provide real-time, highly accurate, low latency measurements of tumor location even as the tumor moves with internal body motions. Such measurements may be suitable for closed-loop radiation delivery applications where radiation therapy may be continuously guided to the tumor site even as the tumor moves. Particularly, the system may dynamically identify planned to actual fiducial correspondences by iterating through the possible assignment permutations. A successful permutation may be recorded and used to orient the patient during follow up treatment sessions.

Claims

1. A computer-implemented method, comprising:

determining, using a sensor assembly of a tracking system, a plurality of measured fiducial positions in or on at least a portion of an animal body, wherein each measured fiducial position generates a location signal at a unique response frequency corresponding to a unique excitation energy from an excitation source of the tracking system;

determining, using at least one of the tracking system and an imaging apparatus, a plurality of planned fiducial positions associated with a radiation therapy plan;

determining, using a processor, a first metric correspondence for a first permutation of the plurality of measured fiducial positions in relation to the plurality of planned fiducial positions, wherein the first metric is determined based on a weighted sum of

distances between the plurality of planned fiducial positions and the plurality of measured fiducial positions,

a rotation, and

an offset between a centroid of the plurality of planned fiducial positions and a centroid of the plurality of measured fiducial positions; and

presenting the first metric to a user via a display.

2. The computer-implemented method of claim 1, wherein the first metric comprises a rotation and registration error assessment metric.

3. The computer-implemented method of claim 1, wherein the distances between the plurality of planned fiducial positions and the plurality of measured fiducial positions comprises a p-norm determination.

4. The computer-implemented method of claim 1, wherein presenting the first metric to the user via the display comprises presenting, to the user, a graphical three-dimensional representation of the plurality of measured fiducial positions and the plurality of planned fiducial positions associated with the plan.

5. The computer-implemented method of claim 4, wherein the graphical three-dimensional representation depicts either the plurality of the measured fiducial positions or the plurality of planned fiducial positions as a surface.

6. The computer-implemented method of claim 1, the method further comprising determining, using the processor, an adjustment associated with the plurality of planned fiducial positions based upon an anticipated deformation in the animal body from a previous measurement of the fiducial positions.

7. A non-transitory computer-readable medium comprising instructions executable by one or more processors to perform a method comprising:

measuring, using a sensor assembly of a tracking system, a plurality of measured fiducial positions in or on at least a portion of an animal body, wherein each measured fiducial position generates a location signal at a unique response frequency corresponding to a unique excitation energy from an excitation source of the tracking system;

determining, using at least one of the tracking system and an imaging apparatus, a plurality of planned fiducial positions associated with a radiation therapy plan;

determining, using the one or more processors, a first metric correspondence for a first permutation of the plurality of measured fiducial positions in relation to the plurality of planned fiducial positions, wherein the first metric is determined based on a weigted sum of at least two of (1) distances between the plurality of planned fiducial positions and the plurality of measured fiducial positions, (2) a rotation, and (3) an offset between a centroid of the plurality of planned fiducial positions and a centroid of the plurality of measured fiducial positions;

determining, using the one or more processors, a second metric correspondence for a second permutation of the plurality of measured fiducial positions in relation to the plurality of planned fiducial positions; and

presenting the first metric and the second metric to a user via a display, wherein presenting the first metric and the second metric includes presenting, to the user, a graphical three-dimensional representation of the plurality of measured fiducial positions and the plurality of planned fiducial positions associated with the plan.

8. The non-transitory computer-readable medium of claim 7, wherein the first metric comprises a rotation and registration error assessment metric.

9. The non-transitory computer-readable medium of claim 7, wherein the first metric is determined based on a weighted sum of:

the distances between the plurality of planned fiducial positions and the plurality of measured fiducial positions;

a rotation; and

an offset between a centroid of the plurality of planned fiducial positions and a centroid of the plurality of measured fiducial positions.

10. The non-transitory computer-readable medium of claim 9, wherein the distances between the plurality of planned fiducial positions and the plurality of measured fiducial positions comprises a p-norm determination.

11. The non-transitory computer-readable medium of claim 7, wherein the graphical three-dimensional representation depicts either the plurality of the measured fiducial positions or the plurality of planned fiducial positions as a surface.

12. The non-transitory computer-readable medium of claim 7, the method further comprising determining, using the one or more processors, an adjustment associated with the plurality of planned fiducial positions based upon an anticipated deformation in the animal body from a previous measurement of the fiducial positions.

13. A computer system comprising:

one or more processors; and

at least one memory comprising instructions executable by the one or more processors to cause the computer system to perform a method comprising;

determining a radiation therapy plan prior to measuring a plurality of measured fiducial positions, wherein the radiation therapy plan defines a plurality of planned fiducial positions;

measuring, using a sensor assembly of a tracking system, the plurality of measured fiducial positions in or on at least a portion of an animal body, wherein each measured fiducial position generates a location signal at a unique response frequency corresponding to a unique excitation energy from an excitation source of the tracking system;

determining, using the one or more processors, an adjustment associated with the plurality of planned fiducial positions based upon an anticipated deformation in the animal body from a previous measurement of the fiducial positions difined by a tissue deformation model;

determining, using the one or more processors, a first metric correspondence for a first permutation of the plurality of measured fiducial positions in relation to the plurality of planned fiducial positions;

determining, using the one or more processors, a second metric correspondence for a second permutation of the plurality of measured fiducial positions in relation to the plurality of planned fiducial positions; and

presenting the first metric and the second metric to a user via a display.

14. The computer system of claim 13, wherein the first metric comprises a rotation and registration error assessment metric.

15. The computer system of claim 13, wherein the first metric is determined based on a weighted sum of:

the distances between the plurality of planned fiducial positions and the plurality of measured fiducial positions;

a rotation; and

an offset between a centroid of the plurality of planned fiducial positions and a centroid of the plurality of measured fiducial positions.

16. The computer system of claim 15, wherein the distances between the plurality of planned fiducial positions and the plurality of measured fiducial positions comprises a p-norm determination.

17. The computer system of claim 13, wherein presenting the first metric and the second metric to the user via the display comprises presenting, to the user, a graphical three-dimensional representation of the plurality of measured fiducial positions and the plurality of planned fiducial positions associated with the plan.

18. The computer system of claim 17, wherein the graphical three-dimensional representation depicts either the plurality of the measured fiducial positions or the plurality of planned fiducial positions as a surface.