Methods and systems for task-based data generation and weighting for ct spectral imaging
AssigneeGeneral Electric Company
InventorsJiahua Fan, Jie Tang, Hewei Gao
Life of this patent
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Abstract
Various methods and systems for weighting material density images based on the material imaged are disclosed. In one embodiment, a method for dual energy imaging of a material comprises generating an odd material density image, generating an even material density image, applying a first weight to the odd material density image and a second weight to the even material density image, and generating a material density image based on a combination of the weighted odd material density image and the weighted even material density image. In this way, the image quality may be improved without increasing a radiation dosage.
Claims20
A method for dual energy imaging of a material, comprising:
- generating an odd material density image;
- generating an even material density image;
- applying a first weight to the odd material density image and a second weight to the even material density image;
- and
- generating a material density image based on a combination of the weighted odd material density image and the weighted even material density image.
A method for dual energy imaging, comprising:
- obtaining a first dataset based on incident high energy spectra and a second dataset based on incident low energy spectra;
- updating the first dataset with an interpolated high energy dataset and the second dataset with an interpolated low energy dataset;
- decomposing the updated first dataset and the updated second dataset into a first material basis and a second material basis;
- separating the first material basis into a first odd subset and a first even subset and the second material basis into a second odd subset and a second even subset;
- transforming the first odd subset and the first even subset respectively into a first odd density image and a first even density image, and the second odd subset and the second even subset respectively into a second odd density image and a second even density image;
- applying a first weight to the first odd density image, a second weight to the first even density image, a third weight to the second odd density image, and a fourth weight to the second even density image;
- generating a first density image based on the weighted first odd density image and the weighted first even density image, and a second density image based on the weighted second odd density image and the weighted second even density image;
- and
- generating a final monochromatic image based on the first density image and the second density image.
An imaging system, comprising:
- an x-ray source that emits a beam of x-rays toward an object to be imaged;
- a detector that receives the x-rays attenuated by the object;
- a data acquisition system (DAS) operably connected to the detector;
- and
- a computer operably connected to the DAS and programmed to:
- generate an odd material density image comprising measured high energy data received from the detector and interpolated low energy data;
- generate an even material density image comprising measured low energy data received from the detector and interpolated high energy data;
- apply a first weight to the odd material density image and a second weight to the even material density image;
- and
- generate a material density image based on a combination of the weighted odd material density image and the weighted even material density image.
Dependencies are inferred from the claim text.