US5400255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reconstruction of images from cone beam data
Assignee: General Electric Co
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Filing: 1994-02-14
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Granted: 1995-03-21
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Expires: 2014-02-14
Abstract
Abstract A computed tomography x-ray imaging system acquires a three-dimensional array of x-ray attenuation values using a cone beam x-ray source [(13)] and a curved two-dimensional array of detector elements [(16)]. Two-dimensional image slices [(55)] are reconstructed using a filtered back projection method, and corrections are made to the images to account for inaccuracies in the reconstruction method and for incomplete data due to the cone beam geometry.
Inventors
- 👤 Hui Hu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:08
CPC Classifications
G; G06; G06T; G06T12/00; G06T12/30; G01; G01N; G01N23/00; G01N23/02; G01N23/04; G01N23/046; H; H05; H05G; H05G1/00; H05G1/08; H05G1/60; G01N2223/00; G01N2223/40; G01N2223/419; G06T2211/00; G06T2211/40; G06T2211/421; Y; Y10; Y10S; Y10S378/00; Y10S378/901
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
A computed tomography imaging system which comprises: a two-dimensional array of detector elements for receiving photons emanating in a cone beam from a source; a digital acquisition system for acquiring two-dimensional arrays of cone beam data from the array of detector elements at a series of views in which the array of detector elements revolves around a central axis; a filter for receiving the cone beam data and filtering the same; means for back projecting the filtered cone beam data to produce image data f M0 (r); row summing means for receiving the cone beam data and summing the values therein along one of two dimensions of said two-dimensional arrays of cone beam data to form one-dimensional arrays of row sum data; means for filtering the row sum data; means for back projecting the filtered row sum data to produce corrective image data f M1 (r); and summing means for combining the image data f M0 (r) with the correction image data f M1 (r) to produce an image slice.
Claim 2
Dependent Claim
170 words
A computed tomography imaging system which comprises: a two-dimensional array of detector elements for receiving photons emanating in a cone beam from a source; a digital acquisition system for acquiring two-dimensional arrays of cone beam data from the array of detector elements at a series of views in which the array of detector elements revolves around a central axis; a filter for receiving the cone beam data and filtering the same; means for back projecting the filtered cone beam data to produce image data f M0 (r); row summing means for receiving the cone beam data and summing the values therein along one of two dimensions of said two-dimensional arrays of cone beam data to form one-dimensional arrays of row sum data; means for filtering the row sum data; means for back projecting the filtered row sum data to produce corrective image data f M1 (r); and summing means for combining the image data f M0 (r) with the correction image data f M1 (r) to produce an image slice.
Claim 3
Dependent Claim
61 words
The computed tomography system as recited in claim 1 which includes: means for receiving the cone beam data and estimating values not provided by the received cone beam data; means for receiving the estimated values and calculating corrected image data f N (r); and the summing means also combines the corrected image data f N (r) to produce the image slice.
Claim 4
Dependent Claim
28 words
The system as recited in claim 1 which includes means for weighting the cone beam data prior to its application to the filter and the row summing means.
Claim 5
Dependent Claim
53 words
The system as recited in claim 1 in which the source produces x-rays and is located on the side opposite the array of detector elements from the central axis, and both the array of detector elements and x-ray source are revolved around the central axis during the acquisition of said series of views.
Claim 6
Dependent Claim
68 words
The system as recited in claim 4 in which the acquired cone beam data is preprocessed to provide x-ray attenuation data for a three-dimensional region about the central axis and between the x-ray source and the array of detector elements, and the image data f M0 (r) and corrective image data f M1 (r) is summed to produce a plurality of two-dimensional image slices through said three-dimensional region.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |