Patent US3878272A successfully refreshed from Google Patents.
Patent US5625190A successfully refreshed from Google Patents.
US5625190A
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Forward projection algorithm
Assignee: General Electric Co
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Filing: 1995-07-11
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Granted: 1997-04-29
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Expires: 2015-07-11
Abstract
Abstract A method for forward projecting data from an image volume to a projection plane is described. In one embodiment, the method includes the steps of rotating the image data by a transaxial angle φ to align the image data with the projection plane. Then, for every axial angle ⊖, and for each y' 0 and for each value v in the projection plane: (a) determining z' 0 =(v-y' 0 sin ⊖)/ cos⊖ and interpolating in the z' direction for each x', to form the line I(x', y' 0 , z' 0 ); and (b) interpolating I(x', y' 0 , z' 0 ) for each value of u.
Inventors
- 👤 Peter S. Crandall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:14
CPC Classifications
G; G06; G06T; G06T12/00; G06T12/20; G01; G01T; G01T1/00; G01T1/29; G01T1/2914; G01T1/2985; A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/037; G06T2211/00; G06T2211/40; G06T2211/424
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
127 words
A method for forward projecting data from an image volume to a projection plane, said method comprising the steps of: rotating the image data by a transaxial angle φ to align the image data with the projection plane so that the image coordinates (x', y'z') are then related to the projection plane coordinates (u, v) by: u=x', and v=y' sinθ+z'cosθ, where θ is the axial angle; and for every angle θ, and for each y' 0 and for each value v in the projection plane: (a) determining z' 0 =(v-y' 0 sinθ)/cosθ and interpolating in the z' direction for each x', to form the line I(x', y' 0 , z' 0 ); and (b) interpolating I(x', y' 0 , z' 0 ) for each value of u.
Claim 2
Independent Claim
127 words
A method for forward projecting data from an image volume to a projection plane, said method comprising the steps of: rotating the image data by a transaxial angle φ to align the image data with the projection plane so that the image coordinates (x', y'z') are then related to the projection plane coordinates (u, v) by: u=x', and v=y' sinθ+z'cosθ, where θ is the axial angle; and for every angle θ, and for each y' 0 and for each value v in the projection plane: (a) determining z' 0 =(v-y' 0 sinθ)/cosθ and interpolating in the z' direction for each x', to form the line I(x', y' 0 , z' 0 ); and (b) interpolating I(x', y' 0 , z' 0 ) for each value of u.
Claim 3
Dependent Claim
20 words
A method in accordance with claim 1 wherein steps (a) and (b) are performed by a processor utilizing data pipelining.
Claim 4
Dependent Claim
21 words
A method in accordance with claim 1 wherein the data to be forward projected is data representative of positron annihilation events.
Claim 5
Independent Claim
72 words
A system for performing forward projection of data from image volume to a projection plane, said system comprising a processor programmed to perform the step of: rotating the image data by a transaxial angle φ to align the image data with the projection plane so that the image coordinates (x', y'z') are then related to the projection plane coordinates (u, v) by: u=x', and v=y'sin ⊖+z'cos⊖, where ⊖ is the axial angle.
Claim 6
Independent Claim
72 words
A system for performing forward projection of data from image volume to a projection plane, said system comprising a processor programmed to perform the step of: rotating the image data by a transaxial angle φ to align the image data with the projection plane so that the image coordinates (x', y'z') are then related to the projection plane coordinates (u, v) by: u=x', and v=y'sin ⊖+z'cos⊖, where ⊖ is the axial angle.
Claim 7
Dependent Claim
77 words
A system in accordance with claim 4 wherein said processor is further programmed, for every angle ⊖, to perform the steps of: for each y' 0 and for each value v in the projection plane: (a) determining z' 0= (v-y' 0 sin⊖)/cos⊖ and interpolating in the z' direction for each x', to form the line I(x', y' 0 , z' 0 ); and (b) interpolating I(x', y' 0 , z' 0 ) for each value of u.
Claim 8
Dependent Claim
16 words
A system in accordance with claim 4 wherein said processor is a processor utilizing data pipelining.
Claim 9
Dependent Claim
21 words
A system in accordance with claim 4 wherein the data to be forward projected is data representative of positron annihilation events.
Claim 10
Dependent Claim
63 words
A processor programmed to perform forward projection of data from an image volume to a projection plane by: rotating the image data by a transaxial angle φ to align the image data with the projection plane so that the image coordinates (x', y'z') are then related to the projection plane coordinates (u, v) by: u=x', and v=y'sin⊖+z'cos⊖, where ⊖ is the axial angle.
Claim 11
Dependent Claim
63 words
A processor programmed to perform forward projection of data from an image volume to a projection plane by: rotating the image data by a transaxial angle φ to align the image data with the projection plane so that the image coordinates (x', y'z') are then related to the projection plane coordinates (u, v) by: u=x', and v=y'sin⊖+z'cos⊖, where ⊖ is the axial angle.
Claim 12
Dependent Claim
73 words
A processor in accordance with claim 8 further programmed to perform, for every angle ⊖, the steps of: for each y' 0 and for each value v in the projection plane: (a) determining z' 0 =(v-y' 0 sin⊖)/cos⊖ and interpolating in the z' direction for each x', to form the line I(x', y' 0 , z' 0 ); and (b) interpolating I(x', y' 0 , z' 0 ) for each value of u.
Claim 13
Dependent Claim
16 words
A processor in accordance with claim 8 wherein said processor is a processor utilizing data pipelining.
Claim 14
Dependent Claim
21 words
A processor in accordance with claim 8 wherein the data to be forward projected is data representative of positron annihilation events.
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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) | 2000-04-28 | 2000-10-28 | 2001-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-28 | 2004-10-28 | 2005-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-28 | 2008-10-28 | 2009-04-29 | $7700.00 | Window Closed / Lapsed |