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US5546439A
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Systems, methods and apparatus for incrementally reconstructing overlapped images in a CT system implementing a helical scan
Assignee: General Electric Co
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Filing: 1995-11-02
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Granted: 1996-08-13
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Expires: 2015-11-02
Abstract
Abstract The present invention, in one form, is a system for producing incremental tomographic images of an object from projection data acquired in a helical scan. The system creates base image data arrays from the projection data. An interpolation algorithm is then applied to the base image data arrays to generate overlapped, or incremental, tomographic images.
Inventors
- 👤 Jiang Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:38
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/032; A61B6/027; Y; Y10; Y10S; Y10S378/00; Y10S378/901
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
53 words
A system for producing incremental tomographic images of an object from projection data acquired in a helical scan, said tomographic image system configured to: (a) create base image data arrays from the projection data; and (b) generate overlapped image data, utilizing an interpolation algorithm, from the data in the base image data arrays.
Claim 2
Independent Claim
53 words
A system for producing incremental tomographic images of an object from projection data acquired in a helical scan, said tomographic image system configured to: (a) create base image data arrays from the projection data; and (b) generate overlapped image data, utilizing an interpolation algorithm, from the data in the base image data arrays.
Claim 3
Dependent Claim
34 words
A system in accordance with claim 1 wherein to create base image data arrays, the system is configured to: identify locations of base images; and generate base image data arrays for the identified locations.
Claim 4
Dependent Claim
22 words
A system in accordance with claim 2 wherein the locations of base images are determined in accordance with the Nyquist sampling theory.
Claim 5
Dependent Claim
16 words
A system in accordance with claim 1 wherein the interpolation algorithm is a LaGrange interpolative algorithm.
Claim 6
Dependent Claim
28 words
A system in accordance with claim 4 where the LaGrange interpolative algorithm is: ##EQU2## where ξ denotes a desired image position; y.sub.ξ denotes the interpolated image; and ##EQU3##
Claim 7
Dependent Claim
41 words
A system in accordance with claim 4 wherein to create base, image data arrays, the system is configured to: identify locations of base images in accordance with the Nyquist sampling theory; and generate base image data arrays for the identified locations.
Claim 8
Independent Claim
52 words
A method for producing a tomographic image of an object from projection data acquired in a helical scan, said method comprising the steps of: (a) creating base image data arrays from the projection data; and (b) generating overlapped images, utilizing an interpolation algorithm, from the data in the base image data arrays.
Claim 9
Independent Claim
52 words
A method for producing a tomographic image of an object from projection data acquired in a helical scan, said method comprising the steps of: (a) creating base image data arrays from the projection data; and (b) generating overlapped images, utilizing an interpolation algorithm, from the data in the base image data arrays.
Claim 10
Dependent Claim
15 words
A method in accordance with claim 7 wherein the interpolation algorithm is a LaGrange algorithm.
Claim 11
Dependent Claim
27 words
A method in accordance with claim 8 wherein the LaGrange algorithm is: ##EQU4## where ξ denotes a desired image position; y.sub.ξ denotes the interpolated image; and ##EQU5##
Claim 12
Dependent Claim
30 words
A method in accordance with claim 7 wherein creating base image data arrays comprises: identifying the locations of base images; and generating base image data arrays for the identified locations.
Claim 13
Dependent Claim
23 words
A method in accordance with claim 10 wherein identifying the locations of base images is performed in accordance with the Nyquist sampling theory.
Claim 14
Dependent Claim
15 words
A method in accordance with claim 10 wherein the interpolation algorithm is a LaGrange algorithm.
Claim 15
Dependent Claim
27 words
A method in accordance with claim 12 wherein the LaGrange algorithm is: ##EQU6## where ξ denotes a desired image position; y.sub.ξ denotes the interpolated image; and ##EQU7##
Claim 16
Dependent Claim
71 words
A computed tomography apparatus, comprising: a gantry having an x-ray source and a detector; a data acquisition system coupled to the detector; and a computer coupled to the data acquisition system, the computer configured to identify, for an object of interest, locations of base images, create base image data arrays for the identified locations, and generate overlapped images, utilizing an interpolation algorithm, from data stored in the base image data arrays.
Claim 17
Dependent Claim
71 words
A computed tomography apparatus, comprising: a gantry having an x-ray source and a detector; a data acquisition system coupled to the detector; and a computer coupled to the data acquisition system, the computer configured to identify, for an object of interest, locations of base images, create base image data arrays for the identified locations, and generate overlapped images, utilizing an interpolation algorithm, from data stored in the base image data arrays.
Claim 18
Dependent Claim
28 words
A computed tomography apparatus in accordance with claim 14 wherein the computer is further configured to identify locations of base images in accordance with the Nyquist sampling theory.
Claim 19
Dependent Claim
17 words
A computed tomography apparatus in accordance with claim 14 wherein the interpolation algorithm is a LaGrange algorithm.
Claim 20
Dependent Claim
29 words
A computed tomography apparatus in accordance with claim 16 wherein the LaGrange algorithm is: ##EQU8## where ξ denotes a desired image position; y.sub.ξ denotes the interpolated image; and ##EQU9##
Claim 21
Dependent Claim
28 words
A computed tomography apparatus in accordance with claim 16 wherein the computer is further configured to identify locations of base images in accordance with the Nyquist sampling theory.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-08-13 | 2000-02-12 | 2000-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-13 | 2004-02-12 | 2004-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-13 | 2008-02-12 | 2008-08-13 | $7700.00 | Window Closed / Lapsed |