Methods and systems for dual-energy subtraction images
AssigneeGE Precision Healthcare LLC
InventorManMohan Singh
Life of this patent
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Abstract
Various methods and systems are provided for reducing beam hardening artifacts and metal artifacts present in images generated with a dual-energy computed tomography (CT) scan protocol. In one embodiment, a method may include obtaining projection data of a region of interest (ROI) of a subject, the projection data acquired at two different x-ray tube energy levels, generating a first monoenergetic image at a first energy level from the projection data, generating a second monoenergetic image at a second energy level from the projection data, subtracting the first monoenergetic image from the second monoenergetic image to obtain a subtracted image, and outputting the subtracted image for display and/or storage.
Claims16
A method for computed tomography (CT) imaging, comprising:
- upon injection of a contrast agent, obtaining projection data of a region of interest (ROI) of a subject via a dual energy CT angiography scan protocol, the projection data acquired at two different x-ray tube energy levels and the ROI comprising a metal component therein;
- generating a first monoenergetic image at a first energy level from the projection data, wherein first monoenergetic image at the first energy level is generated based on a first linear combination of the first material-density image and the second material-density image;
- generating a second monoenergetic image at a second energy level from the projection data;
- subtracting the first monoenergetic image from the second monoenergetic image to obtain a subtracted image;
- and
- outputting the subtracted image for display and/or storage.
An image processing system, comprising:
- one or more processors;
- and
- memory storing instructions executable by the one or more processors to:
- upon injection of a contrast agent, obtain projection data of a region of interest (ROI) of a head of a subject via a dual-energy computed tomography (CT) angiography scan protocol, the projection data acquired at two different x-ray tube energy levels, wherein the head of the subject comprises a coil positioned therein;
- generate a first monoenergetic image at a first energy level from the projection data;
- generate a second monoenergetic image at a second energy level from the projection data, wherein the second monoenergetic image at the second energy level is generated based on a second linear combination of the first material-density image and the second material-density image;
- subtract the first monoenergetic image from the second monoenergetic image to obtain a subtracted image;
- and
- output the subtracted image for display and/or storage.
A method for a computed tomography (CT) imaging system, comprising:
- upon injection of a contrast agent to a subject, executing a dual-energy CT angiography scan protocol via controlling an x-ray source of the CT-imaging system to emit x-ray radiation at a first peak energy level and a second peak energy level to acquire projection data of a head of the subject, the head of the subject including a coil positioned therein, wherein a first projection dataset and a second projection dataset are extracted from the projection data to generate a first material-density image and a second material-density image;
- generating a first monoenergetic image at a first energy level from the projection data, wherein first monoenergetic image at the first energy level is generated based on a first linear combination of the first material-density image and the second material-density image;
- generating a second monoenergetic image at a second energy level from the projection data;
- subtracting the first monoenergetic image from the second monoenergetic image to obtain a subtracted image;
- and
- outputting the subtracted image for display and/or storage.
Dependencies are inferred from the claim text.