Method for circular scan reconstruction in computed tomography and computed tomographic device
First Claim
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1. A computed-tomography method, comprising:
- scanning an object with x-rays to obtain projection data;
reconstructing a first part of an image of the object where full scan data is available;
reconstructing a second part of the image using half-scanning where full scan data is not available;
reconstructing a third part of the image using data extrapolated from the full scan data;
combining weighted sums of overlapping portions of the second and third parts; and
obtaining the image using the first to third parts and the combined weighted sums.
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Abstract
A method of computed-tomography and a computed-tomography apparatus where the portion of the field of view of a subject were full scan data is available is reconstructed using a full-scan algorithm. In the areas where full scan data is not available, half-scanning is used. Data is also extrapolated from the full scan data. The extrapolated data overlaps a portion of the half-scanning data. The extrapolated data and the overlapped portion of the half-scanning data are feathered. The image is reconstructed using the full-scan, half-scan and feathered data. Corner regions in an image are exposed and reconstructed to produce more uniform z-coverage of the reconstruction field of view.
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21 Claims
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1. A computed-tomography method, comprising:
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scanning an object with x-rays to obtain projection data; reconstructing a first part of an image of the object where full scan data is available; reconstructing a second part of the image using half-scanning where full scan data is not available; reconstructing a third part of the image using data extrapolated from the full scan data; combining weighted sums of overlapping portions of the second and third parts; and obtaining the image using the first to third parts and the combined weighted sums. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A computed-tomography apparatus, comprising:
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an x-ray source; an x-ray detector; and a reconstruction processor for reconstructing an image of an subject from data collected by said x-ray detector, wherein the processor reconstructs a first part of the image where full scan data is available; reconstructs a second part of the image using half-scanning data where full scan data is not available; reconstructs a third part of the image using data extrapolated from the full scan data; combines weighted sums of overlapping portions of the second and third parts; and reconstructs the image using the first to third parts and combined weighted sums. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification