MOTION CORRECTION OF SPECT IMAGES
First Claim
Patent Images
1. An image reconstruction method, comprising the acts of:
- acquiring a set of projection data at a plurality of views and time intervals with respect to an imaging volume;
reconstructing a plurality of slices based on the set of projection data and a system matrix associated with the acquisition of the set of projection data;
registering the slices to generate a plurality of transformation vectors describing the translation in three-dimensional space for each time interval during the acquisition of the set of projection data;
determining one or more transformation vectors based on the act of registering the slices;
generating an updated system matrix based on the one or more transformation vectors and the associated time intervals; and
reconstructing a motion-corrected image using the updated system matrix.
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Abstract
The present disclosure relates approaches for removing or reducing the effects of motion in parallel and non-parallel data acquisitions using a nuclear medicine imaging system. In certain embodiments, translation vectors are derived based on a registration performed on transaxial slices generated from the acquired projection data. The translation vectors may be employed to update a system matrix such that images generated using the updated system matrix are free or motion artifacts or have reduced motion artifacts.
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Citations
20 Claims
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1. An image reconstruction method, comprising the acts of:
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acquiring a set of projection data at a plurality of views and time intervals with respect to an imaging volume; reconstructing a plurality of slices based on the set of projection data and a system matrix associated with the acquisition of the set of projection data; registering the slices to generate a plurality of transformation vectors describing the translation in three-dimensional space for each time interval during the acquisition of the set of projection data; determining one or more transformation vectors based on the act of registering the slices; generating an updated system matrix based on the one or more transformation vectors and the associated time intervals; and reconstructing a motion-corrected image using the updated system matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. One or more machine readable media encoding routines that, when executed by a processor, cause acts to be performed comprising:
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reconstructing a plurality of slices based on a set of projection data acquired at a plurality of views and time intervals and a system matrix associated with the acquisition of the set of projection data; generating a plurality of transformation vectors describing the translation in three-dimensional space for each time interval during the acquisition of the set of projection data; determining one or more translational offsets based on the plurality of transformation vectors; and generating an updated system matrix that apply the translational offsets to one or more virtual detectors that correspond to different exposure times during the acquisition of the set of projection data. - View Dependent Claims (13, 14, 15)
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16. An image analysis system, comprising:
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one or more processing components configured to receive measured projections of an imaging volume acquired at different views and time intervals with respect to the imaging volume, and to execute one or more executable routines stored in a memory; the memory storing the one or more executable routines, wherein the stored routines, when executed, reconstruct a plurality of slices based on the set of projection data and a system matrix associated with the acquisition of the set of projection data, register the slices to generate a plurality of transformation vectors describing the translation in three-dimensional space for each time interval during the acquisition of the set of projection data, and generate an updated system matrix based on the plurality of transformation vectors and corresponding time intervals; and interface circuitry configured to allow user interaction with the image analysis system. - View Dependent Claims (17, 18, 19, 20)
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Specification