Systems and methods for artifact removal for computed tomography imaging
AssigneesGeneral Electic Company, Wisconsin Alumni Foundation
InventorsGuang-Hong Chen, Jiang Hsieh
Life of this patent
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Abstract
An imaging system includes a computed tomography (CT) acquisition unit and at least one processor. The CT acquisition unit includes an X-ray source and a CT detector configured to collect CT imaging data of an object to be imaged. The at least one processor is operably coupled to the CT acquisition unit, and is configured to reconstruct an image using the CT imaging information; extract spatial frequency information from at least a portion of the image, wherein the spatial frequency is defined along a longitudinal direction; and remove a periodically recurring artifact from the at least a portion of the image based on a spatial frequency corresponding to a longitudinal collection periodicity to provide a corrected image.
Claims20
An imaging system comprising:
- a computed tomography (CT) acquisition unit comprising an X-ray source and a CT detector configured to collect CT imaging data of an object to be imaged, the object including an acquisition volume comprising a cross-section extending along a longitudinal direction, the X-ray source and CT detector configured to be rotated relative to the object to be imaged and to collect a series of projections of the object as the X-ray source and CT detector rotate relative the object to be imaged, the CT acquisition unit further configured to translate axially relative to the object to be imaged along the longitudinal direction to collect the CT imaging data at plural imaging locations along the longitudinal direction defining a longitudinal collection periodicity;
- and
- at least one processor operably coupled to the CT acquisition unit, the at least one processor configured to:
- reconstruct an image using the CT imaging information;
- extract spatial frequency information from at least a portion of the image, wherein the spatial frequency is defined along the longitudinal direction;
- and
- remove a periodically recurring artifact from the at least a portion of the image based on a spatial frequency corresponding to the longitudinal collection periodicity to provide a corrected image.
A method comprising:
- acquiring computed tomography (CT) imaging information of an acquisition volume comprising a cross-section extending along a longitudinal direction, wherein the CT imaging information is collected at plural imaging locations along the longitudinal direction defining a longitudinal collection periodicity;
- reconstructing an image using the CT imaging information;
- extracting spatial frequency information from at least a portion of the image, wherein the spatial frequency is defined along the longitudinal direction;
- and
- removing a periodically recurring artifact from the at least a portion of the image based on a spatial frequency corresponding to the longitudinal collection periodicity to provide a corrected image.
A tangible and non-transitory computer readable medium comprising one or more computer software modules configured to direct one or more processors to:
- acquire computed tomography (CT) imaging information of an acquisition volume comprising a cross-section extending along a longitudinal direction, wherein the CT imaging information is collected at plural imaging locations along the longitudinal direction defining a longitudinal collection periodicity;
- reconstruct an image using the CT imaging information;
- extract spatial frequency information from at least a portion of the image, wherein the spatial frequency is defined along the longitudinal direction;
- and
- remove a periodically recurring artifact from the at least a portion of the image based on a spatial frequency corresponding to the longitudinal collection periodicity to provide a corrected image.
Dependencies are inferred from the claim text.