Methods and apparatus for improving image quality
AssigneeGE Medical Systems Global Technology Company, LLC
InventorsScott David Wollenweber, Alex Ganin, Mark K. Limkeman, Charles William Stearns
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Abstract
A method for retrospectively correcting data prior to image reconstruction using an imaging system, wherein the method includes acquiring a first sinogram of a first slice of an object at a first axial field of view and a second sinogram of the first slice of the object at a second axial field of view different than the first axial field of view, determining at least one boundary of the object in the first sinogram and the second sinogram at the first slice, measuring a shift between the first sinogram and the second sinogram using the determined boundaries, and generating a corrected image using the measured shift.
Claims27
A method for retrospectively correcting data prior to image reconstruction using an imaging system, said method comprising:
- acquiring a first sinogram of a first slice of an object at a first axial field of view and a second sinogram of the first slice of object at a second axial field of view different than the first axial field of view;
- determining at least one boundary of the object in the first sinogram and the second sinogram at the first slice;
- measuring a shift between the first sinogram and the second sinogram using the determined boundaries;
- and
- generating a corrected image using the measured shift.
A method for retrospectively correcting an image using a Positron Emission Tomography (PET) system, said method comprising:
- acquiring a first sinogram of an object at a first axial field of view and a second sinogram of the object at a second axial field of view different than the first axial field of view;
- generating a threshold value for the first sinogram and the second sinogram.
- traversing a row in a first direction from a first edge to locate a pixel that has an intensity greater than the threshold value
- setting a boundary at a pixel located a predetermined quantity of pixels from the pixel that has an intensity greater than the threshold value
- measuring a shift between the first sinogram and the second sinogram using the set boundaries;
- and
- generating a corrected image using the measured shift.
An imaging system comprising:
- a radiation source;
- a radiation detector;
- and
- a computer operationally coupled to said radiation source and said radiation detector, said computer configured to:
- acquire a first sinogram of an object at a first axial field of view and a second sinogram of the object at a second axial field of view different than the first axial field of view;
- determine at least one boundary of the object in the first sinogram and the second sinogram;
- measure a shift between the first sinogram and the second sinogram using the determined boundaries;
- and
- generate a corrected image using the measured shift.
An Positron Emission Tomography (PET) system comprising:
- a radiation source;
- a radiation detector;
- and
- a computer operationally coupled to said radiation source and said radiation detector, said computer configured to:
- acquire a first sinogram of a first slice of an object at a first axial field of view and a second sinogram of the first slice of object at a second axial field of view different than the first axial field of view;
- generate a threshold value for the first sinogram and the second sinogram.
- traverse a row in a first direction from a first edge to locate a pixel that has an intensity greater than the threshold value
- set a boundary at a pixel located a predetermined quantity of pixels from the pixel that has an intensity greater than the threshold value
- measure a shift between the first sinogram and the second sinogram using the set boundaries;
- and
- generate a corrected image using the measured shift.
A computer readable medium encoded with a program configured to instruct a computer to:
- acquire a first sinogram of a first slice of an object at a first axial field of view and a second sinogram of the first slice of object at a second axial field of view different than the first axial field of view;
- determine at least one boundary of the object in the first sinogram and the second sinogram;
- measure a shift between the first sinogram and the second sinogram using the determined boundaries;
- and
- generate a corrected image using the measured shift.
Dependencies are inferred from the claim text.