EKG-less cardiac image reconstruction
First Claim
Patent Images
1. A method for reconstructing an image of a beating heart in vivo, said method comprising:
- acquiring projection data for at least one z-location within a projection space;
determining peaks in spatial moments for the projection space using the projection data; and
reconstructing the image utilizing peaks in the spatial moments.
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Abstract
A method for reconstructing an image of a beating heart in vivo is described. The method includes acquiring projection data for at least one z-location within a projection space, determining peaks in first order spatial moments for the projection space using the projection data, and reconstructing the image utilizing peaks in the first order spatial moments.
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Citations
30 Claims
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1. A method for reconstructing an image of a beating heart in vivo, said method comprising:
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acquiring projection data for at least one z-location within a projection space;
determining peaks in spatial moments for the projection space using the projection data; and
reconstructing the image utilizing peaks in the spatial moments. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
correlating a plurality of views with z-location information, wherein each view includes projection data acquired at the respective z-location; and
interpolating the projection data from each view to determine projection data at a desired z-location.
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3. A method in accordance with claim 1 wherein determining peaks in the spatial moments comprises automatically extracting projection data for a region of interest (ROI) within each z-location.
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4. A method in accordance with claim 3 wherein determining peaks in the spatial moments further comprises calculating spatial moments in the projection space using the ROI projection data.
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5. A method in accordance with claim 4 wherein determining peaks in the spatial moments further comprises normalizing the spatial moments to determine the peaks.
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6. A method in accordance with claim 1 wherein reconstructing the image comprises correlating a plurality of views with cardiac phase information based on the peaks in the spatial moments, wherein each view includes projection data at a z-location.
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7. A method in accordance with claim 1 wherein reconstructing the image comprises utilizing a plurality of views correlated with z-location data and cardiac phase information to obtain a plurality of two-dimensional images at desired z-locations and cardiac phases, wherein each view includes projection data relevant to a respective z-location and cardiac phase.
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8. A method in accordance with claim 7 wherein reconstructing the image further comprises combining the plurality of two-dimensional images to construct at least one three-dimensional image.
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9. A system for reconstructing an image of a beating heart in vivo, said system comprising a computed tomography (CT) device including an x-ray source, an x-ray detector aligned with said x-ray source, a data acquisition system (DAS) for collecting data from said x-ray detector, and an image reconstructor for reconstructing an image from the collected data, said system configured to:
- acquire projection data for at least one z-location within a projection space;
correlate a plurality of views with z-location information, wherein each view includes projection data acquired at the respective z-location;extract projection data for a region of interest (ROI) within each z-location;
determine peaks in spatial moments for the projection space using the projection data; and
reconstruct an image utilizing peaks in said spatial moments. - View Dependent Claims (10, 11, 12, 13, 14, 15)
determine spatial moments in the projection space using the ROI projection data; and
normalize said spatial moments to determine the peaks.
- acquire projection data for at least one z-location within a projection space;
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13. A system in accordance with claim 9 wherein to reconstruct the image, said system configured to:
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determine cardiac phase information based on the peaks in said spatial moments; and
correlate each view with the cardiac phase information.
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14. A system in accordance with claim 9 wherein to reconstruct the image, said system configured to utilize a plurality of views correlated with z-location data and cardiac phase information to obtain a plurality of two dimensional images at desired z-locations and cardiac phases.
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15. A system in accordance with claim 14 wherein to reconstruct the image, said system further configured to construct a three-dimensional image by combining the plurality of two-dimensional images.
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16. A computer readable medium encoded with a program executable by a computer for processing projection data for at least one z-location within a projection space to construct images of a beating heart in vivo, said program configured to instruct the computer to:
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extract projection data for a region of interest (ROI) within each z-location; and
determine peaks in spatial moments for the projection space using the projection data. - View Dependent Claims (17, 18, 19, 20)
determine cardiac phase information utilizing the determined peaks in said first order spatial moments; and
correlate a plurality of views with the cardiac phase information.
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21. A method for reconstructing an image of a beating heart in vivo, said method comprising:
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interpolating acquired projection data from a plurality of views to determine projection data at a plurality desired z-locations;
automatically extracting projection data for a region of interest (ROI) within each desired z-location;
determining peaks in first order spatial moments for a projection space using the extracted ROI projection data;
determining cardiac phase information based on the peaks in the first order spatial moments; and
reconstructing the image utilizing the cardiac phase information. - View Dependent Claims (22, 23)
calculating spatial moments in the projection data using the extracted ROI projection data; and
normalizing the spatial moments to determine the peaks.
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23. A method in accordance with claim 21 wherein reconstructing comprises:
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correlating the plurality of views with the cardiac phase information;
utilizing the plurality of views correlated with the cardiac phase information to obtain a plurality of two-dimensional images at a desired z-locations and cardiac phases; and
combining the plurality of two-dimensional images to construct at least one three-dimensional image.
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24. A system for reconstructing an image of a beating heart in vivo, said system comprising a computed tomography (CT) device including:
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a data acquisition system (DAS), configured to;
acquire projection data for at least one z-location within a projection space; and
interpolate the projection data to determine projection data for at least one view having at least one desired z-location;
a computer electrically coupled to the DAS configured to;
automatically extract projection data for a region of interest (ROI) within each desired z-location;
determine peaks in first order spatial moments for the projection space using the projection data; and
correlate each view with cardiac phase information; and
an image reconstructor configured to reconstruct an image utilizing peaks in the first order spatial moments. - View Dependent Claims (25, 26, 27)
determine spatial moments in the projection space using the extracted ROI projection data; and
normalize said spatial moments to determine peaks.
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26. A system in accordance with claim 24 wherein to correlate each view with cardiac phase information, said computer further configured to determine the cardiac phase information utilizing determined peaks in the first order spatial moments.
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27. A system in accordance with claim 24 wherein to reconstruct a three-dimensional image, said reconstructor further configured to:
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utilize a plurality of views correlated with cardiac phase information to obtain a plurality of two-dimensional images at desired z-locations and cardiac phases; and
combine the two-dimensional images to construct at least one three-dimensional image.
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28. A computer readable medium encoded with a program executable by a computer for processing projection data for at least one z-location within a projection space to construct images of a beating heart in vivo, said program g configured to instruct the computer to:
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automatically extract projection data for a region of interest (ROI) within each z-location;
determine peaks in first order spatial moments for the projection space using the projection data;
determine cardiac phase information utilizing the peaks in said first order spatial moments; and
correlate a plurality of views with the cardiac phase information. - View Dependent Claims (29, 30)
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Specification