METHOD FOR CIRCULAR SCAN RECONSTRUCTION IN COMPUTED TOMOGRAPHY AND COMPUTED TOMOGRAPHIC DEVICE
First Claim
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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Accused Products
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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Citations
37 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, 18, 19)
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11. A computed tomography method, comprising:
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obtaining a first image of an object using full-scan data; obtaining a second image of said object using half-scan data; subtracting the second image from the first image to obtain a subtracted image; thresholding the subtracted image to obtain a thresholded image; filtering the thresholded image to obtain a filtered image; adding the filtered image and the second image to obtained an added image; and feathering together portions of first image and the added image to obtain a third image. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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20. 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 (21, 22, 23, 24, 25, 26, 27, 28)
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29. A computed tomography apparatus, comprising:
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an x-ray source to expose a subject with x-rays; an x-ray detector to obtain image data of the subject; and a reconstruction processor to reconstruct an image of the subject obtaining a first image of an object using full-scan data; obtaining a second image of said object using half-scan data; subtracting the second image from the first image to obtain a subtracted image; thresholding the subtracted image to obtain a thresholded image; filtering the thresholded image to obtain a filtered image; adding the filtered image and the second image to obtained an added image; and feathering together portions of first image and the added image to obtain a third image. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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Specification