Dynamic computed tomography imaging using positional state modeling
First Claim
1. A method for acquiring diagnostic imaging data of a dynamically moving organ, the method comprising:
- monitoring positional state of the organ motion as a function of time by measuring a physiological parameter and applying a positional state relationship that relates positional state to the measured physiological parameter;
identifying at least two occurrences of a selected positional state within each cycle of motion of the dynamically moving organ based on the measured physiological parameter and the state relationship;
selecting time windows arranged about identified occurrences of the selected positional state including at least said identified at least two occurrences;
acquiring imaging data of the dynamically moving organ at least during the time windows;
combining portions of the imaging data acquired during the time windows corresponding to the selected positional state to form an image data set; and
reconstructing an image representation of the moving organ in the selected positional state from the image data set.
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Abstract
An apparatus for computed tomography (CT) imaging of a cyclically moving organ includes a positional state monitor (24, 40) that monitors a positional state of the cyclically moving organ such as the heart. A cone-beam CT scanner (10) acquires image data at least within a plurality of time windows. Each time window is centered about an occurrence of a selected positional state of the organ. A window analyzer (38) selects a data segment within each time window such that the data segments combine to form a complete data set covering a selected angular range. A reconstruction processor (44) reconstructs the selected data segments into an image representation.
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Citations
25 Claims
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1. A method for acquiring diagnostic imaging data of a dynamically moving organ, the method comprising:
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monitoring positional state of the organ motion as a function of time by measuring a physiological parameter and applying a positional state relationship that relates positional state to the measured physiological parameter; identifying at least two occurrences of a selected positional state within each cycle of motion of the dynamically moving organ based on the measured physiological parameter and the state relationship; selecting time windows arranged about identified occurrences of the selected positional state including at least said identified at least two occurrences; acquiring imaging data of the dynamically moving organ at least during the time windows; combining portions of the imaging data acquired during the time windows corresponding to the selected positional state to form an image data set; and reconstructing an image representation of the moving organ in the selected positional state from the image data set. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An imaging method for acquiring diagnostic imaging data of a dynamically moving organ, the method comprising:
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monitoring positional states of the moving organ as a function of time; selecting time windows arranged about occurrences of a selected positional state; acquiring imaging data of the dynamically moving organ at least during the time windows using an orbiting x-ray source; for each time window, selecting an angular segment of the orbiting x-ray source substantially centered within the time window; shifting each angular segment within its corresponding time window to provide a complete image data set for reconstruction while optimizing centering of the angular segments within their respective windows; and reconstructing an image representation of the moving organ in the selected positional state from the complete image data set. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for computed tomography (CT) imagine of a cyclically moving organ, the apparatus compnsing:
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a positional state monitor that monitors a positional state of the cyclically moving organ; a cone-beam CT scanner that acciuires image data at least within a plurality of time windows, each time window centered about an occurrence of a selected positional state of the organ; a means for selecting a data segment of the acciuired image data in each time window, which data segments (1) taken together form a complete set of image data for reconstruction, and (2) are optimally centered within the time windows; and a reconstruction processor that reconstructs the selected data segments into an image representation of the moving organ in the selected positional state. - View Dependent Claims (19, 20, 21)
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22. An apparatus for acquiring volumetric medical imaging data of a dynamically moving organ, the apparatus comprising:
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a means for monitoring an anatomical state of the organ motion cycling; a means for determining time windows centered on occurrences of substantially similar states of organ motion cycle at different phases of the organ motion; a means for acquiring imaging data at least during the time windows; a means for combining portions of the imaging data acquired during the time windows to form a complete image data set; and a means for reconstructing an image representation from the complete image data set. - View Dependent Claims (23, 24, 25)
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Specification