# US 2014/0152304 A1 · Systems and methods for reduced off-resonance blurring in spiral imaging > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152304 A1 - Document ID: US20140152304A1 - Status: Published application - Kind: A1 - Application number: 13/868,095 - Filed: 2013-04-22 - Published: 2014-06-05 - Earliest claimed: 2012-04-20 - Assignees: University of Virginia Licensing & Ventures Group - Inventors: Samuel W. Fielden; Craig H. Meyer; Xue Feng - Web page: https://patentgrep.com/patent/US20140152304A1 ## CPC - G01R 33/565: Correction of image distortions, e.g. due to magnetic field inhomogeneities - G01R 33/4824: {using a non-Cartesian trajectory} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract 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. ## Claims ### Claim 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 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, 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. ### Claim 2 (depends on 1) The method of claim 1, wherein the first and second redundant trajectories are symmetric about an origin of the k-space. ### Claim 3 (depends on 1) The method of claim 1, wherein the first and second redundant trajectories are mirror images of one another. ### Claim 4 (depends on 1) 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. ### Claim 5 (depends on 1) 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. ### Claim 6 (depends on 1) The method of claim 1, wherein the first acquired spiral interleaf data is averaged after gridding the first set if acquired spiral data onto a Cartesian matrix. ### Claim 7 (depends on 1) The method of claim 1, wherein the number of spiral-in/out interleaves is one. ### Claim 8 (depends on 1) The method of claim 1, wherein acquiring the MRI data comprises slab-selective multi-dimensional spiral turbo spin echo (TSE) sampling. ### Claim 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 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, 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. ### Claim 10 (depends on 9) The system of claim 9, wherein the first and second redundant trajectories are symmetric about an origin of the k-space. ### Claim 11 (depends on 9) The system of claim 9, wherein the first and second redundant trajectories are mirror images of one another. ### Claim 12 (depends on 9) 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. ### Claim 13 (depends on 9) 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. ### Claim 14 (depends on 9) 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. ### Claim 15 (depends on 9) The system of claim 9, wherein the number of spiral-in/out interleaves is one. ### Claim 16 (depends on 9) The system of claim 9, wherein acquiring the MRI data comprises slab-selective multi-dimensional spiral turbo spin echo (TSE) sampling. ### Claim 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 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, 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. ### Claim 18 (depends on 17) The computer-readable storage medium of claim 17, wherein the first and second redundant trajectories are symmetric about an origin of the k-space. ### Claim 19 (depends on 17) The computer-readable storage medium of claim 17, wherein the first and second redundant trajectories are mirror images of one another. ### Claim 20 (depends on 17) 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. ### Claim 21 (depends on 17) 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. ### Claim 22 (depends on 17) The computer-readable storage medium of claim 17, wherein the first acquired spiral interleaf data is averaged after gridding the first set if acquired spiral data onto a Cartesian matrix. ### Claim 23 (depends on 17) The computer-readable storage medium of claim 17, wherein the number of spiral-in/out interleaves is one. ### Claim 24 (depends on 17) The computer-readable storage medium of claim 17, wherein acquiring the MRI data comprises slab-selective multi-dimensional spiral turbo spin echo (TSE) sampling.