Methods and apparatus for image reconstruction
AssigneeGeneral Electric Company
InventorsJiang Hsieh, Fang Frank Dong, Thomas John Myers, George Seidenschnur, Anne Marie Conry, Zachary William Sopcak, Brian Grekowicz
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Abstract
Methods and apparatus for producing an image of an object with a multi-slice imaging apparatus having a row of detectors are provided. The method includes generating a first partial image using projection data acquired at a first imaging position in a step-and-shoot imaging mode, generating a second partial image using projection data acquired at a second imaging position, and combining the partial images to form a final image.
Claims26
A method for producing an image of an object with a multi-slice imaging apparatus, said method comprising:
- generating a first partial image using projection data acquired at a first imaging position in a step-and-shoot imaging mode, wherein the first projection data is weighted using:
- p
- 2
-
- (
- γ
- ,
- β
- ,
- z
- )
- =
- ∑
- k
- =
- 1
- K
-
-
- w
-
- (
- k
- )
-
- p
-
- (
- γ
- ,
- β
- ,
- k
- +
- i
- z
- )
- z specifies the location of the reconstructed image in terms of detector rows,
- iz is the integer portion of z,
- w(k) is the interpolation coefficients, and
- p(γ, β, i) represents a projection sample acquired with detector angle γ, projection angle β, and detector row i
- generating a second partial image using projection data acquired at a second single imaging position;
- and
- combining the partial images to form a final image.
A method for producing an image of an object with a multi-slice imaging apparatus, said method comprising:
- generating a first partial image using projection data acquired at a first single imaging position in a step-and-shoot imaging mode;
- generating a second partial image using projection data acquired at a second single imaging position, wherein the second projection data is weighted using:
- p
- 2
-
- (
- γ
- ,
- β
- ,
- z
- )
- =
- ∑
- k
- =
- 1
- K
-
-
- w
-
- (
- k
- )
-
- p
-
- (
- γ
- ,
- β
- ,
- k
- +
- i
- z
- )
- z specifies the location of the reconstructed image in terms of detector rows,
- iz is the integer portion of z,
- w(k) is the interpolation coefficients, and
- p(γ, γ, i) represents a projection sample acquired with detector angle γ, projection angle β, and detector row i
- combining the partial images to form a final image.
A computed tomographic (CT) imaging system for reconstructing an image of an object, said imaging system comprising:
- a detector array;
- at least one radiation source;
- and
- a computer coupled to said detector array and said radiation source, said computer configured to:
- generate a first partial image using projection data acquired at a first imaging position in a step-and-shoot imaging mode, wherein the first projection data partial image is weighted using:
- p
- 2
-
- (
- γ
- ,
- β
- ,
- z
- )
- =
- ∑
- k
- =
- 1
- K
-
-
- w
-
- (
- k
- )
-
- p
-
- (
- γ
- ,
- β
- ,
- k
- +
- i
- z
- )
- z specifies the location of the reconstructed image in terms of detector rows,
- iz is the integer portion of z,
- w(k) is the interpolation coefficients, and
- p(γ, β, i) represents a projection sample acquired with detector angle γ, projection angle β, and detector row i
- generate a second partial image using projection data acquired at a second imaging position;
- and
- combine the partial images to form a final image.
A computer readable medium encoded with a program code segment executable by a computer for reconstructing an image of an object, said segment programmed to instruct the computer to:
- generate a first partial image using projection data acquired at a first imaging position in a step-and-shoot imaging mode wherein the first partial image is weighted using:
- p
- 2
-
- (
- γ
- ,
- β
- ,
- z
- )
- =
- ∑
- k
- =
- 1
- K
-
-
- w
-
- (
- k
- )
-
- p
-
- (
- γ
- ,
- β
- ,
- k
- +
- i
- z
- )
- z specifies the location of the reconstructed image in terms of detector rows,
- iz is the integer portion of z,
- w(k) is the interpolation coefficients, and
- p(γ, β, i) represents a projection sample acquired with detector angle γ, projection angle β, and detector row i
- generate a second partial image using protection data acquired at a second imaging position:
- and
- combine the partial images to form a final image.
Dependencies are inferred from the claim text.