Gating with anatomically varying durations
First Claim
1. A method for iteratively reconstructing a volumetric image of an overall volume from radioactive emissions, the method comprising:
- a) obtaining radioactive emissions from the overall volume, the overall volume comprising at least a part of a body organ or other body portion;
b) using the radioactive emissions to reconstruct an initial volumetric image of said overall volume, said initial volumetric image containing an initial location and initial shape of said at least a part of a body organ or other body portion and an initial estimation of number of photons emitted from said at least a part of a body organ or other body portion; and
c) reconstructing a further volumetric image from said initial volumetric image by an iterative process using object implantation for refining reconstruction, wherein said object implantation includes;
providing a model of at least a portion of the overall volume, said model including a general location and shape of said at least apart of a body organ or other body portion and an expected number of photons emitted from said at least a part of a body organ or other body portion;
replacing, at said general location, at least a portion of said initial volumetric image with said general shape of said at least a part of a body organ or other body portion, based on said model;
determining an improved estimation of a number of photons emitted from said at least a portion of said initial volumetric image, based on said expected number of photons, wherein said improved estimation is an increase in number of photons over said initial estimation; and
replacing said initial estimation of number of photons with said improved estimation, wherein said object implantation is used one or more times during said iterative process, each time for providing a better starting point for performing a next iteration of said iterative process, whereby said improved estimation is used to redistribute photon counts in an iteration.
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Accused Products
Abstract
A method for reconstructing a radioactive emission image of an overall volume having first and second volumetric regions, each volumetric region having respectively independent dynamic characteristics. The method comprises the following steps: a) obtaining radioactive emissions from the overall volume, including the volumetric regions, b) reconstructing an initial radioactive emission image of the volumetric region according to the radioactive emissions, c) segmenting the initial radioactive emission image to delineate the first and second volumetric regions, and d) separately reconstructing the first and the second volumetric regions according to the respectively independent dynamic characteristics.
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Citations
32 Claims
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1. A method for iteratively reconstructing a volumetric image of an overall volume from radioactive emissions, the method comprising:
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a) obtaining radioactive emissions from the overall volume, the overall volume comprising at least a part of a body organ or other body portion; b) using the radioactive emissions to reconstruct an initial volumetric image of said overall volume, said initial volumetric image containing an initial location and initial shape of said at least a part of a body organ or other body portion and an initial estimation of number of photons emitted from said at least a part of a body organ or other body portion; and c) reconstructing a further volumetric image from said initial volumetric image by an iterative process using object implantation for refining reconstruction, wherein said object implantation includes; providing a model of at least a portion of the overall volume, said model including a general location and shape of said at least apart of a body organ or other body portion and an expected number of photons emitted from said at least a part of a body organ or other body portion; replacing, at said general location, at least a portion of said initial volumetric image with said general shape of said at least a part of a body organ or other body portion, based on said model; determining an improved estimation of a number of photons emitted from said at least a portion of said initial volumetric image, based on said expected number of photons, wherein said improved estimation is an increase in number of photons over said initial estimation; and replacing said initial estimation of number of photons with said improved estimation, wherein said object implantation is used one or more times during said iterative process, each time for providing a better starting point for performing a next iteration of said iterative process, whereby said improved estimation is used to redistribute photon counts in an iteration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for reconstructing a volumetric image of an overall volume from radioactive emissions, the apparatus comprising:
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at least one SPECT or PET detecting unit configured for obtaining radioactive emissions from the overall volume, said overall volume encompassing at least part of a body organ or other body portion; an image reconstruction module configured for reconstructing an initial volumetric image of said overall volume, said initial volumetric image containing an initial location and initial shape of said at least a part of a body organ or other body portion and an initial estimation of number of photons emitted from said at least a part of a body organ or other body portion; and
reconstructing a further volumetric image from said initial volumetric image by an iterative process using an object implantation module,said object implantation module configured for providing a model of at least a portion of the overall volume, said model including a general location and shape of said at least a part of a body organ or other body portion and an expected number of photons emitted from said at least a part of a body organ or other body portion, wherein said image reconstruction module is further configured for reconstructing the further volumetric image by an iterative process, comprising replacing, at said general location, at least a portion of said initial volumetric image with said general shape of said at least a part of a body organ or other body portion, based on said model; determining an improved estimation of a number of photons emitted from said at least a portion of said initial volumetric image, based on said expected number of photons, wherein said improved estimation is an increase in number of photons over said initial estimation; and replacing said initial estimation of number of photons with said improved estimation, wherein said object implantation is used one or more times during said iterative process, each time for providing a better starting point for performing a next iteration of said iterative process, whereby said improved estimation is used to redistribute photon counts in an iteration. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification