CT scanner calibration
A system and method can determine one or more CT scanner calibration parameters from a plurality of calibration object projections in a plurality of radiographs.
1. A computer-implemented method of determining CT calibration settings, the method comprising:
receiving a plurality of radiographs from a CT scanner, each of the plurality of radiographs comprising a plurality of calibration object projections;
determining one or more calibration object projection radiuses in the first radiograph;
determining a projective transformation of each calibration object in the plurality of radiographs;
determining trajectory parameters from the projective transformation of each calibration object; and
determining one or more CT scanner calibration parameters from the trajectory parameters prior to CT reconstruction of the plurality of radiographs.
2. The method of claim 1 , wherein the CT scanner is a cone beam scanner.
3. The method of claim 1 , wherein the one or more CT scanner calibration parameters comprise one or more from the group consisting of a projected horizontal axis shift, a projected rotational axis inclination angle, a vertical shift, detector distance, and axis of rotation distance.
4. The method of claim 1 , wherein determining one or more CT scanner calibration parameters comprises determining a first projection position of each of the plurality of calibration objects in a first projection of the plurality of radiographs.
5. The method of claim 1 , further comprising tracking the plurality of calibration objects in the plurality of radiographs.
6. The method of claim 1 , further comprising determining a rotation direction from the plurality of radiographs.
7. The method of claim 1 , further comprising pre-processing the plurality of radiographs.
8. A system for determining CT calibration settings, comprising: a processor; and
a non-transitory computer-readable storage medium comprising instructions executable by the processor to perform steps comprising:
receiving a plurality of radiographs from a CT scanner, each of the plurality of radiographs comprising a plurality of calibration object projections;
determining one or more calibration object projection radiuses in the first radiograph;
determining a projective transformation of each calibration object in the plurality of radiographs;
determining trajectory parameters from the projective transformation of each calibration object; and
determining one or more CT scanner calibration parameters from the trajectory parameters prior to CT reconstruction of the plurality of radiographs.
9. The system of claim 8 , wherein the CT scanner is a cone beam scanner.
10. The system of claim 8 , wherein the one or more CT scanner calibration parameters from the projective transformation comprise one or more from the group consisting of a projected horizontal axis shift, a projected rotational axis inclination angle, a vertical shift, detector distance, and axis of rotation distance.
11. The system of claim 8 , wherein determining one or more CT scanner calibration parameters comprises determining a first projection position of each of the plurality of calibration objects in a first projection of the plurality of radiographs.
12. The system of claim 8 , further comprising tracking the plurality of calibration objects in the plurality of radiographs.
13. The system of claim 8 , further comprising determining a rotation direction from the plurality of radiographs.
14. The system of claim 8 , further comprising pre-processing the plurality of radiographs.
15. A non-transitory computer readable medium storing executable computer program instructions to determine CT calibration settings, the computer program instructions comprising instructions for:
receiving a plurality of radiographs from a CT scanner, each of the plurality of radiographs comprising a plurality of calibration object projections;
determining one or more calibration object projection radiuses in the first radiograph;
determining a projective transformation of each calibration object in the plurality of radiographs;
determining trajectory parameters from the projective transformation of each calibration object; and
determining one or more CT scanner calibration parameters from the trajectory parameters prior to CT reconstruction of the plurality of radiographs.
16. The medium of claim 15 , wherein the CT scanner is a cone beam scanner.
17. The medium of claim 15 , wherein the one or more CT scanner calibration parameters from the projective transformation comprise one or more from the group consisting of a projected horizontal axis shift, a projected rotational axis inclination angle, a vertical shift, detector distance, and axis of rotation distance.
18. The medium of claim 15 , wherein determining one or more CT scanner calibration parameters comprises determining a first projection position of each of the plurality of calibration objects in a first projection of the plurality of radiographs.
19. The medium of claim 15 , further comprising tracking the plurality of calibration objects in the plurality of radiographs.
20. The medium of claim 15 , further comprising determining a rotation direction from the plurality of radiographs.