X-ray computed tomography apparatus, reconstruction processing apparatus, and image processing apparatus
AssigneesKabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
InventorsSatoru Nakanishi, Naruomi Akino
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Abstract
An X-ray computed tomography apparatus scans a subject to be examined with cone beam X-rays, and generates reference volume data on the basis of projection data. This apparatus extracts a cone beam artifact component contained in the reference volume data on the basis of the typical shape and direction of the cone beam artifact component. This apparatus generates resultant volume data with the reduced cone beam artifact by subtracting the cone beam artifact component from the reference volume data.
Claims17
An X-ray computed tomography apparatus comprising:
- a scanning unit which includes an X-ray tube and an X-ray detector for scanning a subject to be examined with cone beam X-rays;
- a reconstruction unit which generates first image data on the basis of output data from the scanning unit;
- an extraction unit which extracts a cone beam artifact component contained in the first image data, on the basis of a typical shape and typical direction of the cone beam artifact;
- and
- a subtraction unit which generates second image data with a reduced cone beam artifact by subtracting the cone beam artifact component from the first image data.
A reconstruction processing apparatus comprising:
- a storage unit which stores projection data acquired by scanning a subject to be examined with cone beam X-rays;
- a reconstruction unit which generates first image data on the basis of the projection data;
- an extraction unit which extracts a cone beam artifact component contained in the generated first image data on the basis of a typical shape and a typical direction of the cone beam artifact;
- and
- a subtraction unit which generates second image data with a reduced cone beam artifact component by subtracting the extracted cone beam artifact from the first image data.
An image processing apparatus comprising:
- a storage unit which stores first image data generated on the basis of projection data acquired by scanning a subject to be examined with cone beam X-rays;
- an extraction unit which extracts a cone beam artifact component contained in the first image data on the basis of a typical shape and typical direction of the cone beam artifact;
- and
- a subtraction unit which generates second image data with a reduced cone beam artifact component by subtracting the extracted cone beam artifact component from the first image data.
Dependencies are inferred from the claim text.