Method for accelerating data acquisition in dynamic magnetic resonance measurements (MRT) using parallel imaging
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Abstract
A method for time-resolved imaging of N-dimensional magnetic resonance (=MR) with the following steps:
- Acquisition of MR signals from a sample volume by parallel imaging, wherein N-dimensional data matrices (M1, M2, . . . MNt) in k-space is acquired undersampled from each receiver coil, wherein the acquisition of the MR signals is performed according to an acquisition scheme that is periodic over time and describes the time sequence of the undersampled data matrices (M1, M2, . . . Mn) and
- reconstruction of missing data points (FP) of the acquisition scheme using a set of coil weighting factors (CW, <CW>) and using N+1-dimensional reconstruction kernels (RK, RK′ RK″) is characterized in that reconstruction of the missing data points (FP) is performed using a single reconstruction geometry, wherein each reconstruction kernel comprises an (N+1)-dimensional target area (TB), wherein all non-acquired data points (TP) are reconstructed within the associated target area (TB) using each reconstruction kernel (RK, RK′ RK″), and wherein the target area (TB) exhibits at least the extent (nR×mR) in the ky-t plane of the acquisition scheme. This can shorten the computation time for reconstruction and reduce reconstruction artifacts and optimize the signal-to-noise ratio.
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Citations
14 Claims
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1-7. -7. (canceled)
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8. A method for time-resolved imaging of N-dimensional magnetic resonance, the method comprising the steps of:
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a) acquiring MR signals from a sample volume by parallel imaging using multiple receiver coils, wherein a number of NtN-dimensional data matrices in k-space is acquired undersampled with a reduction factor R from each receiver coil, wherein ky is a phase-encoding direction, acquisition of the MR signals being performed according to an acquisition scheme that is periodic over time and which describes a time sequence of the undersampled data matrices; and b) reconstructing missing data points of the acquisition scheme using a set of coil weighting factors and using N+1-dimensional reconstruction kernels that define from which acquired data points reconstruction will be performed, wherein reconstruction of the missing data points of the acquisition scheme is performed using a single reconstruction kernel geometry with each reconstruction kernel comprising an N+1-dimensional target area, wherein all non-acquired data points are reconstructed within an associated target area using each reconstruction kernel, the target area having at least an extent (nR×
mR) in a ky-t plane of the acquisition scheme, wherein n,m=1,2, . . . . - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification