Alternating direction of multipliers method for parallel MRI reconstruction
First Claim
Patent Images
1. A method for reconstructing parallel magnetic resonance images (MRI), comprising:
- providing a set of acquired k-space MR image data y; and
finding a target MR image x that minimizes ½
∥
Fv−
y∥
22+λ
∥
z∥
1 wherein v=Sx and z=Wx wherein S is a diagonal matrix containing sensitivity maps of coil elements in an MR receiver array, F is an FFT matrix wherein FFH=I and H denotes a Hermitian adjoint matrix, W is a redundant Haar wavelet matrix satisfying WTW=I, wherein I is an identity matrix, and λ
≧
0 is a regularization parameter, by updating
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Abstract
A method for reconstructing parallel magnetic resonance images includes providing a set of acquired k-space MR image data y, and finding a target MR image x that minimizes ½∥Fv−y∥22+λ∥z∥1 where v=Sx and z=Wx where S is a diagonal matrix containing sensitivity maps of coil elements in an MR receiver array, F is an FFT matrix, W is a redundant Haar wavelet matrix, and λ≧0 is a regularization parameter, by updating
where k is an iteration counter, μ1 and μ3 are parameters of an augmented Lagrangian function, and bz and bv are dual variables of the augmented Lagrangian.
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Citations
26 Claims
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1. A method for reconstructing parallel magnetic resonance images (MRI), comprising:
-
providing a set of acquired k-space MR image data y; and finding a target MR image x that minimizes ½
∥
Fv−
y∥
22+λ
∥
z∥
1 wherein v=Sx and z=Wx wherein S is a diagonal matrix containing sensitivity maps of coil elements in an MR receiver array, F is an FFT matrix wherein FFH=I and H denotes a Hermitian adjoint matrix, W is a redundant Haar wavelet matrix satisfying WTW=I, wherein I is an identity matrix, and λ
≧
0 is a regularization parameter, by updating - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for reconstructing parallel magnetic resonance images (MRI), comprising:
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providing a set of acquired k-space MR image data y; and finding a target MR image x that optimizes - View Dependent Claims (9, 10, 11, 12, 13)
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14. A non-transitory program storage device readable by a computer, tangibly embodying a program of instructions executed by the computer to perform the method steps for reconstructing parallel magnetic resonance images (MRI), the method comprising the steps of:
-
providing a set of acquired k-space MR image data y; and finding a target MR image x that minimizes ½
∥
Fv−
y∥
22+λ
∥
z∥
1 wherein v=Sx and z=Wx wherein S is a diagonal matrix containing sensitivity maps of coil elements in an MR receiver array, F is an FFT matrix wherein FFH=I and H denotes a Hermitian adjoint matrix, W is a redundant Haar wavelet matrix satisfying WTW=I, wherein I is an identity matrix, and λ
≧
0 is a regularization parameter, by updating - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A non-transitory program storage device readable by a computer, tangibly embodying a program of instructions executed by the computer to perform the method steps for reconstructing parallel magnetic resonance images (MRI), the method comprising the steps of:
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providing a set of acquired k-space MR image data y; and finding a target MR image x that optimizes - View Dependent Claims (22, 23, 24, 25, 26)
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Specification