Determining rotation axis from x-ray radiographs
A system and method of processing a CT scan includes receiving a plurality of radiographs and determining an axis of rotation per scan from the plurality of radiographs prior to CT reconstruction.
1. A computer-implemented method of processing a CT scan, comprising:
receiving a plurality of radiographs; and
determining an axis of rotation per scan from the plurality of radiographs prior to CT reconstruction,
wherein determining the axis of rotation comprises:
determining a representative pixel for each pixel position from the plurality of radiographs to generate a representative image; and
determining a position of line symmetry for at least a row of the representative image.
2. The method of claim 1 , wherein a symmetrical position image comprises a plurality of line symmetrical positions, each of the line symmetrical positions comprising the position of line symmetry.
3. The method of claim 2 , wherein determining the axis of rotation comprises determining a best line fit through the plurality of line symmetrical positions.
4. The method of claim 1 , wherein determining the axis of rotation comprises receiving a photon count of each pixel of each of the plurality of radiographs.
5. The method of claim 4 , further comprising determining a total pixel attenuation coefficient from the photon count for each pixel of each of the plurality of radiographs.
6. The method of claim 1 , wherein determining the axis of rotation comprises filtering each radiograph row of each of the plurality of radiographs.
7. The method of claim 1 , further comprising filtering each representative image row.
8. A computer-implemented system of processing a CT scan, comprising:
a processor;
a non-transitory computer-readable storage medium comprising instructions executable by the processor to perform steps comprising:
receiving a plurality of radiographs; and
determining an axis of rotation per scan from the plurality of radiographs prior to CT reconstruction,
wherein determining an axis of rotation comprises:
determining a representative pixel for each pixel position from the plurality of radiographs to generate a representative image; and
determining a position of line symmetry for at least a row of the representative image.
9. The system of claim 8 , wherein a symmetrical position image comprises a plurality of line symmetrical positions, each of the line symmetrical positions comprising the position of line symmetry.
10. The system of claim 9 , wherein determining the axis of rotation comprises determining a best line fit through the plurality of line symmetrical positions.
11. The system of claim 8 , wherein determining the axis of rotation comprises receiving a photon count of each pixel of each of the plurality of radiographs.
12. The system of claim 11 , further comprising determining a total pixel attenuation coefficient from the photon count for each pixel of each of the plurality of radiographs.
13. The system of claim 8 , wherein determining the axis of rotation comprises filtering each radiograph row of each of the plurality of radiographs.
14. The system of claim 12 , further comprising filtering each representative image row.
15. A non-transitory computer readable medium storing executable computer program instructions for processing a CT scan, the computer program instructions comprising instructions for:
receiving a plurality of radiographs; and
determining an axis of rotation per scan from the plurality of radiographs prior to CT reconstruction,
wherein determining an axis of rotation comprises:
determining a representative pixel for each pixel position from the plurality of radiographs to generate a representative image; and
determining a position of line symmetry for at least a row of the representative image.