THROUGH-TIME RADIAL GRAPPA CALIBRATION
First Claim
1. A method, comprising:
- controlling a parallel magnetic resonance imaging (pMRI) apparatus to acquire, from an object to be imaged, throughout a period of time, two or more radial calibration data sets, where the two or more radial calibration data sets are acquired at different points in time;
controlling the pMRI apparatus to acquire an under-sampled radial data set from the object to be imaged;
controlling the pMRI apparatus to perform a through-time radial GRAPPA calibration comprising computing a GRAPPA weight set from data in the two or more radial calibration data sets; and
controlling the pMRI apparatus to reconstruct an image of the object to be imaged from the under-sampled radial data set where a value for a point missing from k-space in the under-sampled radial data set is computed using the GRAPPA weight set as calibrated and applied for the missing point.
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Accused Products
Abstract
Example systems and methods control a parallel magnetic resonance imaging (pMRI) apparatus to acquire radial calibration data sets throughout time. Example systems and methods also control the pMRI apparatus to acquire an under-sampled radial data set from the object to be imaged. Example systems and methods then control the pMRI apparatus to reconstruct an image of the object to be imaged from the under-sampled radial data set. The reconstruction depends, at least in part, on a through-time radial GRAPPA calibration where a value for a point missing from k-space in the under-sampled radial data set is computed using a GRAPPA weight set calibrated and applied for the missing point. The GRAPPA weight set is computed from data in the radial calibration data sets.
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Citations
23 Claims
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1. A method, comprising:
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controlling a parallel magnetic resonance imaging (pMRI) apparatus to acquire, from an object to be imaged, throughout a period of time, two or more radial calibration data sets, where the two or more radial calibration data sets are acquired at different points in time; controlling the pMRI apparatus to acquire an under-sampled radial data set from the object to be imaged; controlling the pMRI apparatus to perform a through-time radial GRAPPA calibration comprising computing a GRAPPA weight set from data in the two or more radial calibration data sets; and controlling the pMRI apparatus to reconstruct an image of the object to be imaged from the under-sampled radial data set where a value for a point missing from k-space in the under-sampled radial data set is computed using the GRAPPA weight set as calibrated and applied for the missing point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A computer-readable medium storing computer-executable instructions that when executed by a computer control the computer to perform a method, the method comprising:
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controlling a parallel magnetic resonance imaging (pMRI) apparatus to acquire, from an object to be imaged, throughout a period of time, two or more radial calibration data sets, where the two or more radial calibration data sets are acquired at different points in time; controlling the pMRI apparatus to acquire an under-sampled radial data set from the object to be imaged; and controlling the pMRI apparatus to reconstruct an image of the object to be imaged from the under-sampled radial data set based, at least in part on a through-time radial GRAPPA calibration, where a value for a point missing from k-space in the under-sampled radial data set is computed using a GRAPPA weight set calibrated and applied for the missing point, where the GRAPPA weight set is computed from data in the two or more radial calibration data sets.
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19. An apparatus, comprising:
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a radial dataset acquisition logic configured to control a parallel magnetic resonance imaging (pMRI) apparatus to acquire a plurality of radial calibration data sets, where members of the plurality of radial calibration data sets are acquired at different points in time; an under-sampling acquisition logic configured to acquire an under-sampled radial data set from the object to be imaged; a through-time radial GRAPPA calibration logic configured to compute a GRAPPA weight set for a point missing from k-space in the under-sampled radial data set, where the GRAPPA weight set is calibrated for the missing point and computed from data in the plurality of radial calibration data sets; and a reconstruction logic configured to reconstruct an image from the under-sampled radial data set based, at least in part on the GRAPPA weight sets. - View Dependent Claims (20, 21, 22)
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23. A computer-readable medium having stored thereon a data structure comprising:
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a first field storing data representing a radial calibration data set acquired by a pMRI apparatus; a second field storing data representing an under-sampled radial data set acquired by the pMRI apparatus; and a third field storing data representing GRAPPA weights calibrated for a point missing in the under-sampled radial data set, where the GRAPPA weights are calculated from the radial calibration data set.
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Specification