Systems and methods for reduced off-resonance blurring in spiral imaging
Systems, methods of reducing off-resonance blurring in acquired magnetic resonance imaging data. The method includes acquiring a first set of spiral interleaf data for each of one or more spiral-in/out interleaves by performing a first sampling each of one or more locations in k-space along a first redundant spiral-in/out trajectory, and acquiring a second set of spiral interleaf data for each of the one or more spiral-in/out interleaves by performing a second sampling of each of the one or more locations in the k-space along a second redundant spiral-in/out trajectory, wherein the second redundant spiral-in/out trajectory corresponds to a time-reversed trajectory of the first redundant spiral-in/out trajectory. The method may yet further include combining the first set of spiral interleaf data and the second set of spiral interleaf data with an averaging operation such as to reduce artifacts.
1. A method, comprising:
acquiring magnetic resonance imaging (MRI) data associated with an area of interest of a subject, comprising:
acquiring a first set of spiral interleaf data for each of one or more spiral-in/out interleaves by performing a first sampling of each of one or more locations in k-space along a first redundant spiral-in/out trajectory,
acquiring a second set of spiral interleaf data for each of the one or more spiral-in/out interleaves by performing a second sampling of each of the one or more locations in the k-space along a second redundant spiral-in/out trajectory,
wherein the second redundant spiral-in/out trajectory corresponds to a time-reversed trajectory of the first redundant spiral-in/out trajectory, and
combining the first set of spiral interleaf data and the second set of spiral interleaf data with an averaging operation such as to reduce artifacts.
2. The method of claim 1 , wherein the first and second redundant trajectories are symmetric about an origin of the k-space.
3. The method of claim 1 , wherein the first and second redundant trajectories are mirror images of one another.
4. The method of claim 1 , wherein the artifacts that are removed by the averaging operation are caused at least by one or more of main field inhomogeneity, concomitant gradient fields and T2 decay.
5. The method of claim 1 , wherein the first acquired spiral interleaf data is averaged before gridding the first set of acquired spiral data onto a Cartesian matrix.
6. The method of claim 1 , wherein the first acquired spiral interleaf data is averaged after gridding the first set of acquired spiral data onto a Cartesian matrix.
7. The method of claim 1 , wherein the number of spiral-in/out interleaves is one.
8. The method of claim 1 , wherein acquiring the MRI data comprises slab-selective multi-dimensional spiral turbo spin echo (TSE) sampling.
9. A system, comprising:
a magnetic resonance imaging (MRI) device;
one or more processors; and
at least one memory device in communication with the MRI device, storing computer-readable instructions that, when executed by the one or more processors, cause the system to:
acquire magnetic resonance imaging (MRI) data associated with an area of interest of a subject, by:
acquiring, by the MRI device, a first set of spiral interleaf data for each of one or more spiral-in/out interleaves by performing a first sampling of each of one or more locations in k-space along a first redundant spiral-in/out trajectory,
acquiring a second set of spiral interleaf data for each of the one or more spiral-in/out interleaves by performing a second sampling of each of the one or more locations in the k-space along a second redundant spiral-in/out trajectory,
wherein the second redundant spiral-in/out trajectory corresponds to a time-reversed trajectory of the first redundant spiral-in/out trajectory, and
combining, by the one or more processors, the first set of spiral interleaf data and the second set of spiral interleaf data with an averaging operation such as to reduce artifacts.
10. The system of claim 9 , wherein the first and second redundant trajectories are symmetric about an origin of the k-space.
11. The system of claim 9 , wherein the first and second redundant trajectories are mirror images of one another.
12. The system of claim 9 , wherein the artifacts that are removed by the averaging operation are caused at least by one or more of main field inhomogeneity, concomitant gradient fields and T2 decay.
13. The system of claim 9 , wherein the first acquired spiral interleaf data is averaged before gridding the first acquired spiral data onto a Cartesian matrix.
14. The system of claim 9 , wherein the first acquired spiral interleaf data is averaged after gridding the first acquired spiral data onto a Cartesian matrix.
15. The system of claim 9 , wherein the number of spiral-in/out interleaves is one.
16. The system of claim 9 , wherein acquiring the MRI data comprises slab-selective multi-dimensional spiral turbo spin echo (TSE) sampling.
17. A computer-readable storage medium having stored computer-executable instructions that, when executed by one or more processors, cause a computer to perform functions comprising:
acquiring magnetic resonance imaging (MRI) data associated with an area of interest of a subject, comprising:
acquiring a first set of spiral interleaf data for each of one or more spiral-in/out interleaves by performing a first sampling of each of one or more locations in k-space along a first redundant spiral-in/out trajectory,
acquiring a second set of spiral interleaf data for each of the one or more spiral-in/out interleaves by performing a second sampling of each of the one or more locations in the k-space along a second redundant spiral-in/out trajectory,
wherein the second redundant spiral-in/out trajectory corresponds to a time-reversed trajectory of the first redundant spiral-in/out trajectory, and
combining the first set of spiral interleaf data and the second set of spiral interleaf data with an averaging operation such as to reduce artifacts.
18. The computer-readable storage medium of claim 17 , wherein the first and second redundant trajectories are symmetric about an origin of the k-space.
19. The computer-readable storage medium of claim 17 , wherein the first and second redundant trajectories are mirror images of one another.
20. The computer-readable storage medium of claim 17 , wherein the artifacts that are removed by the averaging operation are caused at least by one or more of main field inhomogeneity, concomitant gradient fields and T2 decay.
21. The computer-readable storage medium of claim 17 , wherein the first acquired spiral interleaf data is averaged before gridding the first set of acquired spiral data onto a Cartesian matrix.
22. The computer-readable storage medium of claim 17 , wherein the first acquired spiral interleaf data is averaged after gridding the first set of acquired spiral data onto a Cartesian matrix.
23. The computer-readable storage medium of claim 17 , wherein the number of spiral-in/out interleaves is one.
24. The computer-readable storage medium of claim 17 , wherein acquiring the MRI data comprises slab-selective multi-dimensional spiral turbo spin echo (TSE) sampling.