Radio frequency coil methods and apparatus
Aspects relate to providing radio frequency components responsive to magnetic resonance signals. According to some aspects, a radio frequency component comprises at least one coil having a conductor arranged in a plurality of turns oriented about a region of interest to respond to corresponding magnetic resonant signal components. According to some aspects, the radio frequency component comprises a plurality of coils oriented to respond to corresponding magnetic resonant signal components. According to some aspects, an optimization is used to determine a configuration for at least one radio frequency coil.
1. A radio frequency coil configured to be responsive to magnetic resonance signals, the radio frequency coil comprising:
at least one conductor arranged in a three dimensional geometry about a region of interest in accordance with a coil configuration of the at least one conductor in the three dimensional geometry, the coil configuration determined by performing at least one optimization that determines a value for at least one parameter of a model of the radio frequency coil, wherein the at least one conductor comprises a first conductor having a plurality of turns having non-uniform spacing, each of the plurality of turns comprising a conductive path provided 360° or substantially 360° about a reference axis,
wherein the spacing is determined using the at least one optimization,
wherein the radio frequency coil is tuned to resonate at a frequency corresponding to a B 0 field of less than or equal to 0.1 T and greater than or equal to 50 mT,
wherein the model provides a geometric representation of the radio frequency coil, and wherein the value determined for the at least one parameter configures the model of the radio frequency coil so that simulated operation of the model satisfies a given criteria.
2. The radio frequency coil of claim 1 , wherein a number of turns is determined based, at least in part, on performing the at least one optimization using the model of the radio frequency coil.
3. The radio frequency coil of claim 2 , wherein the number of turns of the at least one conductor about the region of interest is determined based, at least in part, on performing the at least one optimization using the model of the radio frequency coil.
4. The radio frequency coil of claim 3 , wherein the plurality of turns comprises at least 5 turns.
5. The radio frequency coil of claim 3 , wherein the plurality of turns comprises at least 10 turns.
6. The radio frequency coil of claim 3 , wherein the plurality of turns comprises at least 20 turns.
7. The radio frequency coil of claim 3 , further comprising a support on which the at least one conductor is arranged, the support formed to accommodate a portion of human anatomy.
8. The radio frequency coil of claim 7 , wherein the radio frequency coil is a head coil, and wherein the support comprises a helmet formed to accommodate a human head.
9. The radio frequency coil of claim 8 , in combination with at least one auxiliary coil to facilitate noise suppression, the at least one auxiliary coil positioned on or proximate the helmet.
10. The radio frequency coil of claim 9 , wherein the radio frequency coil is configured to detect magnetic resonance signals emitted from a field of view located within the helmet, and wherein the at least one auxiliary coil is positioned so as to respond to environmental noise but not respond to the magnetic resonance signals emitted from the field of view.
11. The radio frequency coil of claim 10 , wherein a configuration of the at least one auxiliary coil is determined using an optimization.
12. The radio frequency coil of claim 11 , wherein the configuration of the at least one auxiliary coil is optimized to reduce or eliminate inductive coupling with the radio frequency coil.
13. The radio frequency coil of claim 1 , wherein the simulated operation of the model includes performing magnetic synthesis so that the coil configuration is optimized at least in part using magnetic synthesis.
14. The radio frequency coil of claim 1 , wherein the at least one optimization determines a configuration of the model of the radio frequency coil that satisfies at least one constraint.
15. The radio frequency coil of claim 14 , wherein the at least one constraint includes a resistance of the radio frequency coil.
16. The radio frequency coil of claim 14 , wherein the at least one constraint includes a length of the at least one conductor.
17. The radio frequency coil of claim 14 , wherein the at least one constraint includes an inductance of the radio frequency coil.
18. The radio frequency coil of claim 1 , wherein the optimization determines a configuration of the model of the radio frequency coil that produces a magnetic field that satisfies the given criteria.
19. The radio frequency coil of claim 18 , wherein the given criteria includes magnetic field homogeneity within the region of interest.
20. The radio frequency coil of claim 18 , wherein the given criteria includes magnetic field strength within the region of interest.
21. The radio frequency coil of claim 1 , wherein the at least one conductor has a length of at least 1 meter.
22. The radio frequency coil of claim 1 , wherein the at least one conductor has a length of at least 2 meters.
23. The radio frequency coil of claim 1 , wherein the at least one conductor has a length of at least 3 meters.
24. The radio frequency coil of claim 1 , wherein the radio frequency coil is tuned to resonate at a frequency corresponding to a B 0 field of less than or equal to 0.2 T and greater than or equal to 0.1 T.
25. The radio frequency coil of claim 1 , wherein the radio frequency coil is tuned to resonate at a frequency corresponding to a B 0 field of less than or equal to 50 mT and greater than or equal to 20 mT.
26. The radio frequency coil of claim 1 , wherein the plurality of turns of the first conductor includes at least one open turn.
27. The radio frequency coil of claim 26 , wherein the plurality of turns of the first conductor are arranged in a spiral.