Methods and apparatus for 3D artifact reduction
First Claim
1. An imaging system for reducing artifacts in a 3D image of an object, said system comprising an x-ray source and a detector away, said system configured to:
- scan the object;
reconstruct an image of the object;
select a threshold intensity level of the reconstructed image; and
determine boundaries of the object using the reconstructed image and the selected threshold intensity.
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Abstract
The present invention, in one form, is a system for reducing artifacts in three-dimensional image formation. More specifically, a 3D image generation algorithm is utilized to generate a composite boundary profile of the object. In one embodiment, the composite boundary profile is determined by selecting an appropriate threshold intensity level. In another embodiment, the composite boundary profile is determined by determining the slope of the boundary, the starting angle of the data set, and the algorithm for helical computed tomography reconstruction. The composite boundary profile is then adaptively filtered to remove inconsistency and thus remove image artifacts in the 3D images.
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Citations
28 Claims
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1. An imaging system for reducing artifacts in a 3D image of an object, said system comprising an x-ray source and a detector away, said system configured to:
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scan the object;
reconstruct an image of the object;
select a threshold intensity level of the reconstructed image; and
determine boundaries of the object using the reconstructed image and the selected threshold intensity. - View Dependent Claims (2, 3, 14, 15, 16)
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4. A method of reducing artifacts in an image of an object acquired in an imaging system, said method comprising the steps of:
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scanning the object;
selecting a threshold intensity level;
determining boundaries of the object;
determining the slope of the object boundaries; and
determining a boundary error. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
where;
f is an edge response of an imaging system;
k is a slope of the object boundary in x-z plane;
h is a slice thickness;
x is an image index variable; and
{circle around (×
)} represents a convolution.
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9. A method in accordance with claim 8 wherein the composite boundary profile for a helical scan is:
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10. A method in accordance with claim 7 further comprising the step of filtering the composite boundary profile.
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11. A method in accordance with claim 10 wherein said filtering the composite boundary profile comprises the step of applying a smoothing filter.
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12. A method in accordance with claim 10 wherein said filtering the composite boundary profile comprises the step of applying a sharpening filter.
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13. A method of seducing artifacts in an image of an object acquired in an imaging system, said method comprising the steps of:
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scanning the object with an imaging system;
reconstructing an image of the object;
selecting a threshold intensity level of the reconstructed image; and
determining boundaries of the object using the reconstructed image and the selected threshold intensity.
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17. A method of reducing artifacts in an image of an object acquired in an imaging system, said method comprising the steps of:
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scanning the object;
selecting a threshold intensity level from a range between 30% and 70% of a maximum threshold intensity and background intensity; and
determining boundaries of the object.
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18. An imaging system for reducing artifacts in a 3D image of an object, said system comprising an x-ray source and a detector array, said system configured to:
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scan the object;
reconstruct an image of the object;
select a threshold intensity level;
determine boundaries of the object;
determine a slope of said object boundaries; and
determine a boundary error. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
where;
f is an edge response of an imaging system;
k is a slope of the object boundary in x-z plane;
h is a slice thickness;
x is an image index variable; and
{circle around (×
)} represents a convolution.
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24. A system in accordance with claim 21 wherein said system is configured to perform a helical scan.
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25. A system in accordance with claim 24 wherein said composite boundary profile is:
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26. A system in accordance with claim 18 further configured to filter said composite boundary profile.
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27. A system in accordance with claim 26 wherein to filter said composite boundary profile, said system configured to apply a smoothing filter.
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28. A system in accordance with claim 26 wherein to filter said composite boundary profile, said system configured to apply a sharpening filter.
Specification