Method and apparatus for calibrating volumetric computed tomography systems
First Claim
1. A method for determining geometry of a scanning volumetric computed tomographic (CT) system, said system having a rotation axis, a rotation plane, an x-ray source, and a detector, said method comprising:
- scanning a phantom having a series of spatially separated discrete markers with the scanning volumetric computed tomographic system, said markers configured on a supporting structure of the phantom so as to permit separate identification of each said marker in a collection of projection images;
locating images of the markers in each projection image;
using the located marker images to assign marker locations to tracks; and
using the assigned tracks for determining a relative alignment between the detector, the source, and the rotation axis of the scanning volumetric computed tomographic system.
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Abstract
The present invention provides a method for determining a geometry of a scanning volumetric computed tomographic (CT) system having a rotation axis, a rotational plane, an x-ray source and a detector. The method includes scanning a phantom having a series of spatially separated discrete markers with the scanning volumetric computed tomographic system, wherein the markers are configured on a supporting structure of the phantom so as to permit separate identification of each marker in a collection of projection images. The method further includes locating images of the markers in each projection, using the located marker images to assign marker locations to tracks, and using the assigned tracks, determining a relative alignment between the detector, the source, and the rotation axis of the scanning volumetric computed tomographic system.
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Citations
18 Claims
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1. A method for determining geometry of a scanning volumetric computed tomographic (CT) system, said system having a rotation axis, a rotation plane, an x-ray source, and a detector, said method comprising:
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scanning a phantom having a series of spatially separated discrete markers with the scanning volumetric computed tomographic system, said markers configured on a supporting structure of the phantom so as to permit separate identification of each said marker in a collection of projection images; locating images of the markers in each projection image; using the located marker images to assign marker locations to tracks; and using the assigned tracks for determining a relative alignment between the detector, the source, and the rotation axis of the scanning volumetric computed tomographic system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for determining geometry of a scanning volumetric computed tomographic (CT) system, said system having a rotation axis, a rotation plane, a radiation source other than an x-ray source, and a detector, said method comprising:
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scanning a phantom having a series of spatially separated discrete markers with the scanning volumetric computed tomographic system utilizing the radiation source other than an x-ray source, said markers configured on a supporting structure of the phantom so as to permit separate identification of each said marker in a collection of projection images; locating images of the markers in each projection image; using the located marker images to assign marker locations to tracks; and using the assigned tracks for determining a relative alignment between the detector, the source, and the rotation axis of the scanning volumetric computed tomographic system. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification