EP0492897A2
Expired / Lapsed
EP
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Reconstructing a 3-D image
Assignee: General Electric Co
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Filing: 1991-12-11
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Granted: —
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Expires: 2011-12-11
Abstract
Abstract A methods and apparatus is disclosed for 3D CT image reconstruction involving a conventional 2D CT reconstruction. A 3D image of the object is reconstructed slice-by-slice by employing, for each slice, a 2D reconstruction procedure, for example, filtered backprojection, on the values of the 2D projection images in the plane of the slice to calculate a 2D image of the object for each of the slices. <IMAGE>
Inventors
- 👤 Kwok Cheong Tam
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 12:07
CPC Classifications
G; G06; G06T; G06T12/00; G06T12/20; G06T2211/00; G06T2211/40; G06T2211/416; G06T2211/421
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
132 words
A method for reconstructing a 3D image of an object from cone beam projection data, said method comprising: determining values at least representing planar integrals on a plurality of planes containing a reference axis in Radon space from the cone beam projection data; on each of the planes containing the reference axis, employing 2D CT reconstruction procedure to calculate from the values representing planar integrals a 2D projection image of the object on the particular plane; and defining slices in planes perpendicular to the reference axis and reconstructing the 3D image of the object slice-by-slice by employing for each slice a 2D CT reconstruction procedure on the values of the 2D projection images in the plane of the slice to calculate a 2D image of the object for each of the slices.
Claim 2
Dependent Claim
30 words
A method in accordance with Claim 1, wherein the 2D CT reconstruction procedure employed to calculate a 2D projection image of the object on the particular plane comprises filtered backprojection.
Claim 3
Dependent Claim
21 words
A method in accordance with Claim 1, wherein the 2D CT reconstruction procedure employed to reconstruct each slice comprises filtered backprojection.
Claim 4
Dependent Claim
46 words
A method in accordance with Claim 1, which comprises employing a plurality of 2D CT reconstruction processors operating in parallel to calculate the 2D projection images of the object, each of the 2D CT reconstruction processors operating on a subset of the total number of planes.
Claim 5
Dependent Claim
19 words
A method in accordance with Claim 4, which comprises employing filtered backprojection processors as the 2D CT reconstruction processors.
Claim 6
Dependent Claim
33 words
A method in accordance with Claim 1, which comprises employing a plurality of 2D CT reconstruction processors operating in parallel to calculate the 2D image of the object for each of the slices.
Claim 7
Dependent Claim
19 words
A method in accordance with Claim 6, which comprises employing filtered backprojection processors as the 2D CT reconstruction processors.
Claim 8
Independent Claim
121 words
A method for reconstructing a 3D image of an object from planar integrals determined from detected signals resulting from an imaging agent, said method comprising: organizing the planar integrals in a plurality of planes containing a reference axis; on each of the planes containing the reference axis, employing 2D CT reconstruction procedure to calculate a 2D projection image of the object on the particular plane; and defining slices in planes perpendicular to the reference axis and reconstructing the 3D image of the object slice-by-slice by employing for each slice a 2D CT reconstruction procedure on the values of the 2D projection images in the plane of the slice to calculate a 2D image of the object for each of the slices.
Claim 9
Dependent Claim
30 words
A method in accordance with Claim 8, wherein the 2D CT reconstruction procedure employed to calculate a 2D projection image of the object on the particular plane comprises filtered backprojection.
Claim 10
Dependent Claim
21 words
A method in accordance with Claim 8, wherein the 2D CT reconstruction procedure employed to reconstruct each slice comprises filtered backprojection.
Claim 11
Dependent Claim
46 words
A method in accordance with Claim 8, which comprises employing a plurality of 2D CT reconstruction processors operating in parallel to calculate the 2D projection image of the object, each of the 2D CT reconstruction processors operating on a subset of the total number of planes.
Claim 12
Dependent Claim
19 words
A method in accordance with Claim 11, which comprises employing filtered backprojection processors as the 2D CT reconstruction processors.
Claim 13
Dependent Claim
33 words
A method in accordance with Claim 8, which comprises employing a plurality of 2D CT reconstruction processors operating in parallel to calculate the 2D image of the object for each of the slices.
Claim 14
Dependent Claim
19 words
A method in accordance with Claim 13, which comprises employing filtered backprojection processors as the 2D CT reconstruction processors.
Claim 15
Independent Claim
150 words
A method for identifying a region of interest within an object and reconstructing a 3D image of a portion of the object including the region of interest from cone beam projection data, said method comprising: determining values at least representing planar integrals on a plurality of planes containing a reference axis in Radon space from the cone beam projection data; on each of the planes containing the reference axis, employing 2D CT reconstruction procedure to calculate from the values representing planar integrals a 2D projection image of the object on the particular plane; performing image processing on a subset of the 2D projection images to identify any regions of interest; and defining slices in planes perpendicular to the reference axis and employing, for each slice spanning any identified regions of interest, a 2D CT reconstruction procedure on the values of the 2D projection images in the plane of the slice.
Claim 16
Dependent Claim
17 words
A method in accordance with Claim 15, wherein the regions of interest comprise flaws in the object.
Claim 17
Dependent Claim
46 words
A method in accordance with Claim 15, which comprises employing a plurality of 2D CT reconstruction processors operating in parallel to calculate the 2D projection images of the object, each of the 2D CT reconstruction processors operating on a subset of the total number of planes.
Claim 18
Dependent Claim
19 words
A method in accordance with Claim 17, which comprises employing filtered backprojection processors as the 2D CT reconstruction processors.
Claim 19
Dependent Claim
33 words
A method in accordance with Claim 15, which comprises employing a plurality of 2D CT reconstruction processors operating in parallel to calculate the 2D image of the object for each of the slices.
Claim 20
Dependent Claim
19 words
A method in accordance with Claim 19, which comprises employing filtered backprojection processors as the 2D CT reconstruction processors.
Claim 21
Dependent Claim
201 words
Parallel processing apparatus for reconstructing a 3D image of an object from cone beam projection data, said apparatus comprising: a plurality of 2D CT reconstruction processors; means for computing values at least representing planar integrals on a plurality of planes containing a reference axis in Radon space from the come beam projection data; means for distributing the values representing planar integrals on the plurality of planes among said 2D CT reconstruction processors such that said 2D CT reconstruction processors calculate a 2D projection image of the object on each of the planes, each of said 2D CT reconstruction processors operating on a subset of the total number of planes; means for organizing the 2D projection images on each of the planes containing the reference axis into slices in planes perpendicular to the reference axis; and further means for distributing the images organized as slices among said 2D CT reconstruction processors such that said 2D CT reconstruction processors calculate a 2D image of the object for each of the slices, each of said 2D CT reconstruction processors operating on a subset of the total number of slices; whereby the 2D images for the slices together represent the 3D image of the object.
Claim 22
Dependent Claim
16 words
Apparatus in accordance with Claim 21, wherein said 2D CT reconstruction processors comprise filtered backprojection processors.
References Cited (Backward Citations)
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