System and method for couch sag compensation

Patent metadata

Field	Value
Publication number	US-12089980-B2
Application number	US-202318333534-A
Country	US
Kind code	B2
Filing date	Jun 12, 2023
Priority date	Feb 8, 2018
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

The method may include obtaining a first set of imaging data affording a sagittal view relating to a subject and a first couch supporting the subject. The first couch may have a plurality of first positions reflected in the first set of imaging data as a first conformation. The method may also include determining a displacement field associated with a first set of imaging data with respect to the reference conformation based on the first conformation and a reference conformation. The method may further include adjusting the first set of imaging data with respect to the reference conformation based on the displacement field. In some embodiments, the method may include obtaining an image of the subject with respect to the reference conformation based on the adjusted first set of imaging data.

First claim

We claim:

1. A method implemented on a computing device having at least one processor and at least one computer-readable storage medium, the method comprising:
obtaining a first set of imaging data relating to a subject and a first couch supporting the subject, the first couch having a plurality of first positions reflected in the first set of imaging data as a first conformation;
determining an intersection between a reference conformation and the first conformation; and
determining, based on the intersection between the reference conformation and the first conformation, the first conformation, and the reference conformation, a displacement field associated with the first set of imaging data with respect to the reference conformation, the displacement field including a plurality of displacement components corresponding to the plurality of first positions.

2. The method of claim 1 , wherein the determining, based on the intersection between the reference conformation and the first conformation, the first conformation, and the reference conformation, a displacement field associated with the first set of imaging data with respect to the reference conformation includes:
for one first position of the first couch,
determining a corrected first point on the reference conformation corresponding to a first point of the first set of imaging data on the first conformation based on the intersection, the first point corresponding to the one first position of the first couch; and
determining a displacement component associated with the first point, wherein the displacement component of the first point is determined as a vector from the first point to the corrected first point.

3. The method of claim 2 , wherein a first distance between the corrected first point and the intersection equals to a second distance between the first point and the intersection.

4. The method of claim 2 , wherein the displacement component of the first point includes a third distance from the first point to the corrected first point, and a direction from the first point to the corrected first point.

5. The method of claim 2 , wherein distances between various first points and the intersection change as a function of corresponding first positions nonlinearly.

6. The method of claim 1 , further comprising:
adjusting, based on the displacement field, the first set of imaging data with respect to the reference conformation; and
obtaining, based on the adjusted first set of imaging data, an image of the subject with respect to the reference conformation.

7. The method of claim 6 , wherein the adjusting, based on the displacement field, the first set of imaging data with respect to the reference conformation includes:
adjusting imaging data in an axial view corresponding to the first point in a sagittal view based on the displacement component corresponding to the first point.

8. The method of claim 7 , further comprising:
generating an adjusted 3D image slice or an adjusted 2D image slice in a view other than the axial view based on the adjusted imaging data.

9. The method of claim 6 , wherein the adjusting, based on the displacement field, the first set of imaging data with respect to the reference conformation includes:
moving, based on the displacement field, spatial basis function representations corresponding to the first set of imaging data.

10. The method of claim 1 , wherein the displacement field includes a plurality of rotation angles, and the plurality of rotation angles relate to spatial basis function representations corresponding to the first set of imaging data.

11. The method of claim 10 , further comprising:
determining a reference position of the first couch reflected in the first set of imaging data, the first conformation of the first couch coinciding with the reference conformation at the reference position, the reference position corresponding to a reference spatial basis function representation.

12. The method of claim 1 , wherein the reference conformation includes a straight horizontal line.

13. The method of claim 1 , wherein the reference conformation corresponds to a plurality of second positions reflected in a second set of imaging data.

14. The method of claim 13 , wherein the second set of imaging data afford a sagittal view relating to the subject and a second couch supporting the subject, and the plurality of second positions correspond to the second couch.

15. A method implemented on a computing device having at least one processor and at least one computer-readable storage medium, the method comprising: obtaining a stack of image slices affording axial views relating to a subject or a region of interest (ROI) of the subject and a first couch supporting the subject, the first couch having a plurality of first positions reflected in the stack of image slices as a first conformation; determining an intersection between a reference conformation and the first conformation; determining, based on the intersection between the reference conformation and the first conformation, the first conformation, and the conformation, a displacement field associated with the stack of image slices with respect to the reference conformation, the displacement field including a plurality of displacement components corresponding to the plurality of first positions, and each image slice of the stack corresponding to one displacement component of the plurality of displacement components.

16. The method of claim 15 , further comprising:
adjusting, based on the displacement field, spatial basis function representations corresponding to imaging data, wherein the imaging data corresponds to the stack of image slices.

17. The method of claim 15 , further comprising:
adjusting, based on the displacement field, the stack of image slices.

18. The method of claim 15 , wherein the first conformation corresponds to a plurality of first positions of a first couch reflected in the stack of image slices, and the reference conformation corresponds to a plurality of second positions of a second couch reflected in an image slice affording a sagittal view.

19. The method of claim 18 , wherein the stack of image slices are acquired by a first device and the image slice is acquired by a second device different from the first device.

20. A method implemented on a computing device having at least one processor and at least one computer-readable storage medium, the method comprising:
obtaining a first image slice in a first view relating to a subject or a region of interest (ROI) of the subject and a first conformation, the first image slice corresponding to a stack of second image slices in a second view; and
determining an intersection between a reference conformation and the first conformation;
determining, based on the intersection between the reference conformation and the first conformation, the first conformation, and the reference conformation, a displacement field associated with the first image slice with respect to the reference conformation, the displacement field including a plurality of displacement components, and each second image slice of the stack corresponding to one displacement component of the plurality of displacement components.

Assignees

• Shanghai United Imaging Healthcare Co Ltd

Inventors

• Bose Supratik
• Maltz Jonathan

Classifications

• A61B5/704

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