Methods and systems for scatter and tailing correction
AssigneeGE Precision Healthcare LLC
InventorMichael Wilk
Life of this patent
Estimating the term…
Abstract
Various methods and systems are provided for a method for nuclear medicine (NM) imaging, comprising, acquiring imaging data with at least two energy windows, pre-processing acquired imaging data to separate distributions of scattered photons and peak photons, performing a main iterative reconstruction to reconstruct a corrected imaging using scatter correction, tailing correction, and/or scatter and tailing correction from distributions of scattered photons and peak photons, and outputting the corrected image.
Claims17
A method for scatter and tailing correction, comprising:
- acquiring imaging data with at least two energy windows, wherein the at least two energy windows comprise a peak energy window and at least one scatter energy window with a range of energies less than and not overlapping with a range of energies of the peak energy window;
- pre-processing acquired imaging data to separate distributions of scattered photons and peak photons, wherein pre-processing acquired imaging data includes performing an initial iterative reconstruction of images from each of the at least two energy windows to generate an initial peak image, and solving a system of equations to calculate a pure scatter image for each scatter energy window;
- performing a main iterative reconstruction to reconstruct a corrected image using scatter correction, tailing correction, and/or scatter and tailing correction from distributions of scattered photons and peak photons, wherein reconstructing the corrected image using scatter correction comprises eliminating scattered photons by:
- adding pre-calculated scatter from the pure scatter image for each scatter energy window to the initial peak image during each iteration of an iterative reconstruction to forward project a reconstructed, corrected image;
- and
- outputting the corrected image.
A system, comprising:
- a detector array including a plurality of detectors;
- and
- a computing device communicatively coupled to the detector array and configured with instructions in non-transitory memory that when executed cause the computing device to:
- acquire, via the detector array, imaging data separated into a photopeak energy window and at least one scatter energy window;
- remove photopeak photons from the imaging data in each of the at least one scatter energy window to obtain a corrected scatter distribution for each scatter energy window;
- combine the at least one scatter energy window and the photopeak energy window into a single window;
- perform iterative reconstruction using the single window and the corrected scatter distribution to generate a corrected image, wherein performing iterative reconstruction comprises adding tailing photons to the single window during the iterative reconstruction;
- and
- output the corrected image.
A method for nuclear medicine (NM) imaging, comprising:
- acquiring, with a plurality of detectors, imaging data separated into a photopeak energy window and a scatter energy window;
- reconstructing a first image including the photopeak energy window to generate a photopeak image;
- reconstructing an image of the scatter energy window to generate a scatter energy reconstructed image;
- performing at least one of tailing correction and scatter and tailing correction on the photopeak image;
- and
- outputting a corrected image.
Dependencies are inferred from the claim text.