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US 8,135,186 B2Granted
Method and system for image reconstruction
AssigneesPurdue Research Foundation, General Electric Company, University of Notre Dame du Lac
InventorsCharles A. Bouman, Ken David Sauer, Jean-Baptiste Thibault, Zhou Yu
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Abstract
Disclosed is an imaging system including a source generating an x-ray beam, a detector array receiving the x-ray beam and generating projection data, a translatable table configured for disposal of an object thereon and operable to translate in relation to the source and the detector array, the source and the detector array rotating about the translatable table to scan the object, and an image reconstructor electrically coupled to the detector array and configured to reconstruct an image in response to the projection data via an iterative reconstruction technique configured to perform a targeted statistical reconstruction.
Claims17
An imaging system comprising:
- a source generating an x-ray beam;
- a detector array receiving said x-ray beam and generating projection data;
- a translatable table configured for disposal of an object thereon and operable to translate in relation to said source and said detector array;
- said source and said detector array rotating about said translatable table to scan said object;
- and
- an image reconstructor electrically coupled to said detector array and configured to reconstruct an image in response to said projection data via an iterative reconstruction technique configured to perform a targeted statistical reconstruction;
- wherein the image reconstructor is configured to perform said iterative reconstruction technique by weighting each of a plurality of pixels in said image according to a contribution of each of said pixels to a region of interest;
- the image reconstructor is further configured to perform said iterative reconstruction technique by updating in low resolution each of said plurality of pixels that said weighting determines to be most contributory to said region of interest;
- the image reconstructor is further configured to perform said iterative reconstruction technique by performing a high resolution forward projection in said region of interest and performing a low resolution forward projection over the remaining area of said image;
- and
- the image reconstructor is further configured to perform said iterative reconstruction technique by correcting for a resulting cumulative forward projection that is not scale-invariant.
8 more elements
A method of reconstructing an image of an object comprising:
- providing projection data generated by a scanning device;
- and
- performing an iterative reconstruction technique to reconstruct the image in response to said projection data, wherein said reconstruction technique performs a targeted statistical reconstruction;
- wherein said performing said iterative reconstruction technique, in performing said targeted statistical reconstruction, includes:
- weighting each of a plurality of pixels in said image according to a contribution of each of said pixels to a region of interest, and updating in low resolution of each of said plurality of pixels that said weighting determines to be most contributory to said region of interest, said weighting and said updating implemented via a weighted non-homogeneous coordinate descent algorithm;
- wherein said performing said iterative reconstruction technique, in performing said targeted statistical reconstruction, includes performing a high resolution forward projection in said region of interest and performance of a low resolution forward projection over a remaining area of said image, wherein said performing said iterative reconstruction technique, in performing said targeted statistical reconstruction also includes correcting for a resulting cumulative forward projection that is not scale-invariant;
- wherein said performing and said correcting include running a low resolution reconstruction and saving final low resolution synthesized projections derived from said low resolution reconstruction, subtracting a region of interest portion of said low resolution forward projection from said final low resolution synthesized projections, adding said high resolution forward projection of said region of interest to said final low resolution synthesized projections, said adding and said subtracting creating a set of corrected synthesized projections, and running n a high resolution reconstructing using said set of corrected synthesized projections.
4 more elements
A method of reconstructing an image comprising:
- scanning an object to acquire projection data;
- performing an iterative reconstruction technique to reconstruct the image in response to said projection data, wherein said reconstruction technique includes,
- weighting each of a plurality of pixels in said image according to a contribution of each of said pixels to a region of interest,
- updating in low resolution each of said plurality of pixels that said weighting determines to be most contributory to said region of interest,
- performing a high resolution forward projection in said region of interest and performing a low resolution forward projection over the remaining area of said image,
- correcting for a resulting cumulative forward projection that is not scale-invariant, and
- updating in high resolution high frequency components disposed outside of said region of interest;
- and
- performing a targeted statistical reconstruction via said iterative reconstruction technique.
6 more elements
A method of reconstructing an image of an object comprising:
- providing projection data generated by a scanning device;
- performing an iterative reconstruction technique to reconstruct the image in response to said projection data, wherein said reconstruction technique performs a targeted statistical reconstruction;
- wherein said performing said reconstruction technique, in performing said targeted statistical reconstruction, includes:
- performing a high resolution forward projection in a region of interest and performing a low resolution forward projection over a remaining area of said image;
- correcting for a resulting cumulative forward projection that is not scale-invariant by:
- performing a low resolution reconstruction and saving final low resolution synthesized projections derived from said low resolution reconstruction;
- and
- subtracting a region of interest portion of said low resolution forward projection from said from final low resolution synthesized projections;
- and
- adding said high resolution forward projection of said region of interest to said final low resolution synthesized projections to obtain a set of corrected synthesized projections;
- and
- performing a high resolution reconstructing using said set of corrected synthesized projections.
9 more elements
Dependencies are inferred from the claim text.