US6084936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Almost-everywhere extrapolation from cone-beam data
Assignee: General Electric Co
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Filing: 1998-07-10
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Granted: 2000-07-04
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Expires: 2018-07-10
Abstract
Abstract A source applies imaging energy that passes through an object being imaged and is then detected by a detector. A scanning trajectory causes the detector to provide a Cauchy data set of measured cone beam data to a processor. The processor extrapolates by use of John's equation such that missing cone beam data is determined. The measured cone beam data and the determined cone beam data together provide a complete data set for exact image reconstruction.
Inventors
- 👤 Sarah Kathryn Patch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:10
CPC Classifications
G; G06; G06T; G06T12/00; G06T12/10; A; A61; A61B; A61B6/00; A61B6/02; A61B6/027; Y; Y10; Y10S; Y10S378/00; Y10S378/901
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
93 words
A method of imaging an object comprising the steps of: applying imaging energy from a source to the object; detecting imaging energy that has passed through the object by use of a detector; scanning the object with the imaging energy such that the detector collects measured image data that constitutes a Cauchy data set for John's equation; extrapolating from the Cauchy data set to solve John's equation and determine missing cone beam data; and supplying an image of the object based on the measured image data and the determined missing cone beam data.
Claim 2
Independent Claim
93 words
A method of imaging an object comprising the steps of: applying imaging energy from a source to the object; detecting imaging energy that has passed through the object by use of a detector; scanning the object with the imaging energy such that the detector collects measured image data that constitutes a Cauchy data set for John's equation; extrapolating from the Cauchy data set to solve John's equation and determine missing cone beam data; and supplying an image of the object based on the measured image data and the determined missing cone beam data.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the image of the object is an exact reconstruction of the object up to measurement and discretization errors.
Claim 4
Dependent Claim
27 words
The method of claim 2 wherein the measured image data and the determined missing cone beam data together constitute a complete data set for image reconstruction purposes.
Claim 5
Dependent Claim
19 words
The method of claim 3 wherein the detector is an area detector and the source is a point source.
Claim 6
Dependent Claim
23 words
The method of claim 4 wherein the scanning step is accomplished by moving the source in a scanning trajectory relative to the object.
Claim 7
Dependent Claim
23 words
The method of claim 4 wherein the scanning step is accomplished by moving the object in a scanning trajectory relative to the source.
Claim 8
Dependent Claim
36 words
The method of claim 4 wherein the scanning step uses a circular scanning trajectory and the missing cone beam data determined by the extrapolating step includes data corresponding to points interior to the circular scanning trajectory.
Claim 9
Dependent Claim
39 words
The method of claim 4 wherein the scanning step uses a scanning trajectory with some portions lying in a plane and the missing cone beam data determined by the extrapolating step includes data corresponding to points in the plane.
Claim 10
Dependent Claim
40 words
The method of claim 1 wherein the measured image data and the determined missing cone beam data together constitute a complete data set for image reconstruction purposes, the detector is an area detector, and the source is a point source.
Claim 11
Dependent Claim
26 words
The method of claim 1 wherein the extrapolation step determines missing data from within a region based on data measured at the boundary of the region.
Claim 12
Independent Claim
95 words
A system for imaging an object comprising: a source for applying imaging energy to the object; a detector for detecting imaging energy that has passed through the object; a positioner scanning the object with the imaging energy such that the detector collects measured image data that constitutes a Cauchy data set for John's equation; an extrapolator extrapolating from the Cauchy data set to solve John's equation and determine missing cone beam data; and an image supplier supplying an image of the object based on the measured image data and the determined missing cone beam data.
Claim 13
Independent Claim
95 words
A system for imaging an object comprising: a source for applying imaging energy to the object; a detector for detecting imaging energy that has passed through the object; a positioner scanning the object with the imaging energy such that the detector collects measured image data that constitutes a Cauchy data set for John's equation; an extrapolator extrapolating from the Cauchy data set to solve John's equation and determine missing cone beam data; and an image supplier supplying an image of the object based on the measured image data and the determined missing cone beam data.
Claim 14
Dependent Claim
24 words
The system of claim 11 wherein the image of the object is an exact reconstruction of the object up to measurement and discretization errors.
Claim 15
Dependent Claim
27 words
The system of claim 12 wherein the measured image data and the determined missing cone beam data together constitute a complete data set for image reconstruction purposes.
Claim 16
Dependent Claim
19 words
The system of claim 13 wherein the detector is an area detector and the source is a point source.
Claim 17
Dependent Claim
19 words
The system of claim 14 wherein the positioner moves the source in a scanning trajectory relative to the object.
Claim 18
Dependent Claim
19 words
The system of claim 14 wherein the positioner moves the object in a scanning trajectory relative to the source.
Claim 19
Dependent Claim
32 words
The system of claim 14 wherein the positioner provides a circular scanning trajectory and the extrapolator determines missing cone beam data including data corresponding to points interior to the circular scanning trajectory.
Claim 20
Dependent Claim
37 words
The system of claim 14 wherein the positioner provides a scanning trajectory with some portions lying in a plane and the missing cone beam data determined by the extrapolator includes data corresponding to points in the plane.
Claim 21
Dependent Claim
40 words
The system of claim 11 wherein the measured image data and the determined missing cone beam data together constitute a complete data set for image reconstruction purposes, the detector is an area detector, and the source is a point source.
Claim 22
Dependent Claim
25 words
The system of claim 11 wherein the extrapolator determines missing data from within a region based on data measured at the boundary of the region.
References Cited (Backward Citations)
US5598453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-07-04 | 2004-01-03 | 2004-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-07-04 | 2008-01-03 | 2008-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-07-04 | 2012-01-03 | 2012-07-04 | $7700.00 | Window Closed / Lapsed |