Robust self-navigating MRI using large coil arrays
A method for providing at least one motion corrected magnetic resonance imaging (MRI) image of an object in an MRI system with an array of a plurality of receiving coils is provided. At least one motion navigator signal of the object is provided. Individual navigator data are collected from each of the plurality of receiving coils. Motion estimates are generated for each of the plurality of receiving coils from the collected individual navigator data. A subset of the plurality of coils is found that detects a dominant motion by clustering the generated motion estimates. Only motion estimates from coils in the found subset are used to create a determined motion estimate. At least one MRI image is reconstructed using the determined motion estimate.
1. A method for providing at least one motion corrected magnetic resonance imaging (MRI) image of an object in an MRI system with an array of a plurality of receiving coils, comprising:
providing at least one motion navigator signal of the object;
collecting individual navigator data from each of the plurality of receiving coils;
generating motion estimates for each of the plurality of receiving coils from the collected individual navigator data;
finding a subset of the plurality of coils that detect a dominant motion by clustering the generated motion estimates;
using only motion estimates from coils in the found subset to create a determined motion estimate; and
reconstructing at least one MRI image using the determined motion estimate.
2. The method, as recited in claim 1 , further comprising:
providing an MRI excitation of the object;
reading out MRI image data at the plurality of receiving coils, wherein the reconstructing at least one MRI image uses the MRI image data.
3. The method, as recited in claim 2 , wherein a number of coils in the found subset is less than half a number of the plurality of coils in the array.
4. The method, as recited in claim 3 , wherein the reconstructing at least one MRI image creates a plurality of motion-resolved images.
5. The method, as recited in claim 3 , wherein the reconstructing at least one MRI image creates at least one motion-corrected image.
6. The method, as recited in claim 3 , wherein the clustering the generated motion estimates, comprises finding clusters on each axis of a 3D MRI acquisition, and wherein the using the motion estimates comprises averaging the motion estimates in each cluster.
7. The method, as recited in claim 3 , wherein the using the motion estimates, comprise averaging the motion estimates in a cluster.
8. The method as recited in claim 3 , wherein the using the motion estimates, comprises using a weighted linear combination of the motion estimates.
9. The method, as recited in claim 3 , wherein the providing the at least one navigator signal of the object and providing the MRI excitation of the object occur simultaneously.
10. The method, as recited in claim 3 , wherein the providing at last one navigator signal of the object and the providing the MRI excitation, comprises providing a translational motion signal.
11. The method, as recited in claim 3 , wherein the plurality of coils of the array is at least 8 coils.
12. The method, as recited in claim 2 , wherein the providing the at least one navigator signal of the object and providing the MRI data acquisition of the object occur simultaneously after an MRI excitation.
13. The method, as recited in claim 1 , wherein a number of coils in the found subset is less than half a number of the plurality of coils in the array.
14. The method, as recited in claim 1 , wherein the reconstructing at least one MRI image creates a plurality of motion-resolved images.
15. The method, as recited in claim 1 , wherein the reconstructing at least one MRI image creates at least one motion-corrected image.
16. The method, as recited in claim 1 , wherein the clustering the generated motion estimates, comprises finding clusters on each axis of a 3D MRI acquisition, and wherein the using the motion estimates comprises averaging the motion estimates in each cluster.
17. The method, as recited in claim 1 , wherein the providing at last one navigator signal of the object and the providing the MRI excitation, comprises providing a translational motion signal.
18. The method, as recited in claim 1 , wherein the plurality of coils of the array is at least 8 coils.
19. A method for providing at least one motion corrected magnetic resonance imaging (MRI) image of an object in an MRI system with an array of a plurality of receiving coils, comprising:
providing at least one motion navigator signal of the object;
collecting individual navigator data from each of the plurality of receiving coils;
generating motion estimates for each of the plurality of receiving coils from the collected individual navigator data;
finding a subset of the plurality of coils that detect a dominant motion by clustering the generated motion estimates, wherein the number of coils in the subset is less than half of a number of the plurality of receiving coils in the array;
using only motion estimates from coils in the subset to create a determined motion estimate;
providing an MRI excitation of the object;
reading out MRI image data at the plurality of receiving coils; and
reconstructing at least one MRI image using the determined motion estimate and the readout MRI data.