Method and apparatus for real time respiratory gating signal generation and detection of body deformation using embedded fiber bragg gratings
A method and system of compensating for body deformation during image acquisition or external beam treatment includes acquiring image data of a body and peak wavelength data from a plurality of fiber Bragg gratings (FBGs) disposed on the body aligned along a predetermined coordinate system on the body, such as a cartesian coordinate system. The method further comprises detecting effective shifts of the Bragg wavelengths of the FBGs caused by body deformation during image acquisition, and controlling the movement of the body through a cavity in a scanning device and controlling the acquisition of the image data or external beam treatment during body deformation based on the effective shifts of the Bragg wavelengths of the FBGs.
1. A method of compensating for body deformation during image acquisition, the method comprising:
acquiring wavelength data from at least one fiber Bragg grating (FBG) device disposed on a body;
detecting effective shifts of Bragg wavelengths in the wavelength data caused at least in part by body deformation during image acquisition; and
controlling a scanning device, based at least in part on the effective shifts of the Bragg wavelengths in the wavelength data, to acquire image data.
2. The method of claim 1 , wherein the controlling the scanning device includes controlling the scanning device to acquire image data while compensating for body deformation.
3. The method of claim 1 , wherein the controlling the scanning device includes controlling the scanning device such that image data is not acquired during body deformation.
4. The method of claim 1 , further comprising:
controlling movement of the body relative to the scanning device based at least in part on the effective shifts of the Bragg wavelengths in the wavelength data, the controlling including preventing movement of the body during body deformation.
5. The method of claim 1 , further comprising:
identifying an object within the body; and
estimating movement of the object by correlating the acquired image data with the effective shifts of the Bragg wavelengths in the wavelength data.
6. The method of claim 1 , further comprising:
reconstructing the image data based at least in part on the effective shifts of the Bragg wavelengths in the wavelength data to compensate for body deformation during the image acquisition.
7. The method of claim 1 , wherein the acquiring wavelength data includes acquiring wavelength data from a plurality of FBG devices disposed on the body and aligned along a predetermined coordinate system.
8. The method of claim 7 , wherein the effective shifts of the Bragg wavelengths for the plurality of FBGs measure strain along at least one axis of the predetermined coordinate system.
9. A method of compensating for body deformation during image acquisition, the method comprising:
acquiring wavelength data from at least one fiber Bragg grating (FBG) device disposed on a body;
detecting effective shifts of Bragg wavelengths in the wavelength data caused at least in part by body deformation; and
controlling a scanning device, based at least in part on the effective shifts of the Bragg wavelengths, to acquire image data while compensating for the body deformation.
10. The method of claim 9 , further comprising:
generating a respiratory gating signal based on the effective shifts of the Bragg wavelengths measured over time, and
wherein the controlling the scanning device includes controlling the scanning device, based at least in part on the respiratory gating signal, such that image data is not acquired during body deformation.
11. The method of claim 10 , further comprising:
controlling movement of the body relative to the scanning device based at least in part on the respiratory gating signal such that movement of the body is prevented during body deformation.
12. The method of claim 9 , further comprising:
identifying a target region within the body; and
estimating movement of the target region by correlating the acquired image data with the effective shifts of the Bragg wavelengths in the wavelength data.
13. The method of claim 9 , wherein the acquiring wavelength data includes acquiring wavelength data from a plurality of FBG devices disposed on the body and aligned along a predetermined coordinate system.
14. The method of claim 13 , wherein the effective shifts of the Bragg wavelengths for the plurality of FBGs measure strain along at least one axis of the predetermined coordinate system.
15. A method of compensating for body deformation during an external beam treatment, the method comprising:
acquiring wavelength data from at least one fiber Bragg grating (FBG) device disposed on a body;
detecting effective shifts of Bragg wavelengths in the wavelength data caused at least in part by body deformation; and
controlling the external beam treatment to compensate for the body deformation based on the effective shifts of the Bragg wavelengths, thereby maintaining focus on a target region of the body.
16. The method of claim 15 , wherein the acquiring wavelength data includes acquiring wavelength data from a plurality of FBG devices disposed on the body and aligned along a predetermined coordinate system.
17. The method of claim 16 , wherein the effective shifts of the Bragg wavelengths for the plurality of FBGs measure strain along at least one axis of the predetermined coordinate system.
18. The method of claim 15 , wherein the external beam treatment is external beam radiotherapy or proton beam therapy.
19. The method of claim 15 , further comprising:
generating a respiratory gating signal based on the effective shifts of the Bragg wavelengths measured over time, and
wherein the controlling the external beam treatment includes controlling the external beam treatment, based at least in part on the respiratory gating signal, such that treatment is not directed to the target region during body deformation.
20. The method of claim 15 , further comprising:
controlling a scanning device, based at least in part on the effective shifts of the Bragg wavelengths, to acquire image data of the target region while compensating for the body deformation.
21. The method of claim 20 , further comprising:
identifying, within the target region, an object for the external beam treatment; and
estimating movement of the object by correlating the acquired image data with the effective shifts of the Bragg wavelengths in the wavelength data.
22. The method of claim 21 , further comprising:
directing the external beam treatment to the object based at least in part on the estimated movement.
23. The method of claim 21 , wherein the object is one of an internal organ or a tumor.
24. A method of compensating for body deformation during an external beam treatment, the method comprising:
acquiring wavelength data from at least one fiber Bragg gratings (FBG) device disposed on a body;
detecting effective shifts of Bragg wavelengths in the wavelength data caused at least in part by body deformation;
controlling a scanning device, based at least in part on the effective shifts of the Bragg wavelengths, to acquire image data of a target region while compensating for the body deformation; and
controlling the external beam treatment to maintain focus on the target region based on the acquired image data.
25. The method of claim 24 , wherein the effective shifts of the Bragg wavelengths measure strain along at least one axis of a predetermined coordinate system.
26. The method of claim 24 , further comprising:
generating a respiratory gating signal based on the effective shifts of the Bragg wavelengths measured over time, and
wherein the controlling the external beam treatment includes controlling the external beam treatment, based at least in part on the respiratory gating signal, such that treatment is not directed to the target region during body deformation.
27. The method of claim 24 , further comprising:
identifying, within the target region, an object for receiving the external beam treatment; and
estimating movement of the object by correlating the acquired image data with the effective shifts of the Bragg wavelengths in the wavelength data.
28. The method of claim 27 , further comprising:
directing the external beam treatment to the object based at least in part on the estimated movement.
29. The method of claim 28 , wherein the object is one of an internal organ or a tumor.
30. The method of claim 29 , wherein the external beam treatment is external beam radiotherapy or proton beam therapy.