Through-time non-cartesian grappa calibration

A non-transitory computer-readable medium storing computer-executable instructions that when executed by a computer control the computer to perform a method, the 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 non-Cartesian calibration data sets, where the two or more non-Cartesian calibration data sets are acquired at different points in time;
• controlling the pMRI apparatus to acquire an under-sampled non-Cartesian 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 non-Cartesian data set based, at least in part on a through-time non-Cartesian GRAPPA calibration, where a value for a point missing from k-space in the under-sampled non-Cartesian 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 non-Cartesian calibration data sets.

An apparatus usable with a parallel magnetic resonance imaging apparatus, comprising:

• a non-Cartesian dataset acquisition logic configured to control a parallel magnetic resonance imaging (pMRI) apparatus in order to acquire a plurality of non-Cartesian calibration data sets, where members of the plurality of non-Cartesian calibration data sets are acquired at different points in time;
• an under-sampling acquisition logic configured to acquire an under-sampled non-Cartesian data set from the object to be imaged;
• a through-time non-Cartesian GRAPPA calibration logic configured to compute a GRAPPA weight set for a point missing from k-space in the under-sampled non-Cartesian data set, where the GRAPPA weight set is calibrated for the missing point and computed from data in the plurality of non-Cartesian calibration data sets;
• and
• a reconstruction logic configured to reconstruct an image from the under-sampled non-Cartesian data set based, at least in part on the GRAPPA weight sets.

A non-transitory computer-readable medium having stored thereon a data structure comprising:

• a first field storing data representing a non-Cartesian calibration data set acquired by a pMRI apparatus;
• a second field storing data representing an under-sampled non-Cartesian 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 non-Cartesian data set, where the GRAPPA weights are calculated from the non-Cartesian calibration data set.