Methods and systems to facilitate reducing cone beam artifacts in images
First Claim
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1. A computer programmed to generate computed tomographic (CT) images from a set of projection data acquired during a CT scan, said computer programmed to:
- perform a cone-angle-and-image-plane-dependent view weighting, wherein the view weighting is at least partially defined by an orthogonal distance between an image plane and a central plane;
apply a Feldkamp, Davis, and Kress (FDK) algorithm with the cone-angle-and-image-plane-dependent view weighting to the set of projection data;
apply an FDK algorithm to a single circular source trajectory expressed as;
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Abstract
Methods and systems for generating images from a set of projection data acquired during a CT scan is provided. The system includes a computer programmed to utilize at least one of a cone angle dependent view weighting and an image plane dependent view weighting to generate an image.
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Citations
25 Claims
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1. A computer programmed to generate computed tomographic (CT) images from a set of projection data acquired during a CT scan, said computer programmed to:
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perform a cone-angle-and-image-plane-dependent view weighting, wherein the view weighting is at least partially defined by an orthogonal distance between an image plane and a central plane; apply a Feldkamp, Davis, and Kress (FDK) algorithm with the cone-angle-and-image-plane-dependent view weighting to the set of projection data; apply an FDK algorithm to a single circular source trajectory expressed as; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer programmed to generate computed tomographic (CT) images from a set of projection data acquired during a CT scan, said computer programmed to:
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perform a cone-angle-and-image-plane-dependent view weighting, wherein the view weighting is at least partially defined by an orthogonal distance between an image plane and a central plane; apply an FDK algorithm to more than one circular source trajectory spaced apart in the z-direction that define respective central planes such that a distance between the image plane and a first trajectory is l, and a distance between the IP and a second trajectory is L−
l and wherein the more than one circular source trajectory are expressed as;
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10. A method for producing a cross-sectional image of an object by using a computed tomography imaging system, which includes a source of a conical beam of radiation and a multi-row detector array arranged on opposite sides of an axis of rotation, said method comprising:
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rotating the source and detector array about the axis of rotation; while rotating, collecting x-ray attenuation data samples from the multi-row detector array at a plurality of projection angles to produce a set of projection data measured with a circular orbit of the x-ray source; and generating an image using a Feldkamp, Davis , and Kress (FDK) algorithm from the set of projection data using a cone-angle-and-image-plane-dependent view weighting, wherein the view weighting is at least partially defined by an orthogonal distance between an image plane and a central plane, wherein the FDK algorithm is applied to a single circular source trajectory expressed as; - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A computed tomographic (CT) imaging system for reconstructing an image of an object, said imaging system comprising:
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a detector array; at least one radiation source; and a computer coupled to said detector array and said radiation source, said computer configured to utilize a cone-angle-and-image-plane-dependent view weighting function to generate three-dimensional images from cone-beam projections measured with a circular orbit of the radiation source, wherein the view weighting is at least partially defined by an orthogonal distance between an image plane and a central plane wherein said cone-angle-and-image-plane-dependent view weighting function to the FDK algorithm is expressed as; - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification