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US 7,548,604 B2Granted
Method and apparatus for reduction of metal artifacts in CT imaging
AssigneeGeneral Electric Company
InventorsBruno K. B. De Man, Deborah Joy Walter
Life of this patent
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Abstract
A method and apparatus for reducing artifacts in image data generated by a computed tomography system is provided. The artifacts are due to the presence of a high density object in a subject of interest. CT data is acquired at a number of differing tilt angles. The data is then combined and reconstructed to generate an improved composite image substantially free of artifacts caused by the high density object.
Claims16
A method of reducing metal artifacts in CT imaging comprising:
- performing a first scan to acquire first CT projection data of a region of interest at a first irradiation angles maintained for the duration of the first scan;
- performing a second scan to acquire second CT projection data of the region of interest at a second irradiation angle maintained for the duration of the second scan;
- and
- combining the first and second CT projection data acquired at each of the first and second irradiation angles so as to reduce metal artifacts in a resulting image.
1 more element
A CT imaging system to reduce metal artifacts comprising:
- a CT imaging apparatus comprising a data acquisition module including a gantry having a bore designed to receive a patient therethrough, the gantry having at least one x-ray source and an x-ray detector disposed therein to emit x-rays toward the patient and receive x-rays attenuated by the patient, respectively, the CT imaging apparatus further comprising a computer programmed to:
- acquire CT projection data at a plurality of different tilt angles;
- merge the CT projection data to create an aggregate image;
- and
- wherein the merging is based on one of a variance map, morphological operations, and an iterative reconstruction process.
2 more elements
Dependencies are inferred from the claim text.