Radio-frequency coil signal chain for a low-field MRI system
A radio-frequency (RF) coil for use in a low-field magnetic resonance imaging system and methods of making the same are provided. The RF coil may include a conductor arranged on a substrate in an arrangement such that symmetry in the arrangement cancels at least a portion of a common mode voltage when a current is passed through the conductor. The RF coil may be included in a magnetic resonance imaging (MRI) system for imaging a patient having at least one B 0 magnet for generating a B 0 magnetic field.
1. A radio-frequency (RF) coil for use in a low-field magnetic resonance imaging system, the RF coil comprising:
a conductor arranged on a substrate in an arrangement such that symmetry in the arrangement cancels at least a portion of a common mode voltage when a current is passed through the conductor.
2. The RF coil of claim 1 , further comprising the substrate, wherein:
the substrate comprises a first side and a second side;
the substrate comprises grooves formed in first and second sides of the substrate; and
the conductor is disposed in the grooves formed in the first and second sides of the substrate, the conductor having a first portion wound around the substrate from the first side to the second side at a first plurality of locations spaced between the first side and the second side and a second portion wound around the substrate from the second side to the first side at a second plurality of locations spaced between the first side and the second side.
3. The RF coil of claim 2 , wherein the first plurality of locations alternate with the second plurality of locations spaced between the first side and the second side.
4. The RF coil of claim 3 , wherein the first portion comprises a first series of full turns wound around a circumference of the substrate from the first side to the second side and the second portion comprises a second series of full turns wound around the circumference of the substrate from the second side to the first side.
5. The RF coil of claim 3 , wherein the first portion comprises first partial turns wound around a circumference of the substrate from the first side to the second side, and the second portion comprises second partial turns wound around the circumference of the substrate from the second side to the first side.
6. The RF coil of claim 5 , wherein the first partial turns and the second partial turns are 180 degree turns.
7. The RF coil of claim 3 , wherein the first plurality of locations and the second plurality of locations are spaced from the first side of the substrate using a same spacing.
8. The RF coil of claim 2 , wherein:
the first portion of the conductor crosses over the second portion of the conductor; and
the arrangement comprises a balanced winding pattern.
9. A method of manufacturing a radio-frequency (RF) coil for use in a low-field magnetic resonance imaging system, the method comprising:
providing a substrate having grooves formed therein; and
arranging a conductor in the grooves formed in the substrate in an arrangement such that symmetry in the arrangement cancels at least a portion of a common mode voltage when a current is passed through the conductor.
10. The method of claim 9 , wherein:
the substrate comprises a first side and a second side, the grooves being formed in the first side and the second side of the substrate; and
arranging the conductor in the grooves formed in the substrate in the arrangement comprises:
winding a first portion of the conductor around the substrate from the first side to the second side at a first plurality of locations spaced between the first side and the second side; and
winding a second portion of the conductor around the substrate from the second side to the first side at a second plurality of locations spaced between the first side and the second side.
11. The method of claim 10 , wherein the first plurality of locations alternate with the second plurality of locations spaced between the first side and the second side.
12. The method of claim 10 , wherein:
winding the first portion of the conductor around the substrate comprises winding the first portion of the conductor around the substrate in a first series of full turns wound around a circumference of the substrate from the first side to the second side; and
winding the second portion of the conductor around the substrate comprises winding the second portion of the conductor around the substrate in a second series of full turns wound around the circumference of the substrate from the second side to the first side.
13. The method of claim 10 , wherein:
winding the first portion of the conductor around the substrate comprises winding the first portion of the conductor around the substrate in first partial turns wound around a circumference of the substrate from the first side to the second side, and
winding the second portion of the conductor around the substrate comprises winding the second portion of the conductor around the substrate in second partial turns wound around the circumference of the substrate from the second side to the first side.
14. The method of claim 13 , wherein the first partial turns and the second partial turns are 180 degree turns.
15. The method of claim 10 , wherein the first plurality of locations and the second plurality of locations are spaced from the first side of the substrate using a same spacing.
16. The method of claim 10 , wherein:
the first portion of the conductor crosses over the second portion of the conductor; and
the arrangement comprises a balanced winding pattern.
17. A magnetic resonance imaging (MRI) system for imaging a patient, the MRI system comprising:
at least one B 0 magnet for generating a B 0 magnetic field; and
a radio-frequency (RF) coil comprising a conductor arranged on a substrate in an arrangement such that symmetry in the arrangement cancels at least a portion of a common mode voltage when current is passed through the conductor.
18. The MRI system of claim 17 , wherein:
the RF coil further comprises the substrate, the substrate having a first side and a second side;
the substrate comprises grooves formed in first and second sides of the substrate; and
the conductor is disposed in the grooves formed in the first and second sides of the substrate, the conductor having a first portion wound around the substrate from the first side to the second side at a first plurality of locations spaced between the first side and the second side and a second portion wound around the substrate from the second side to the first side at a second plurality of locations spaced between the first side and the second side.
19. The MRI system of claim 18 , wherein the first plurality of locations alternate with the second plurality of locations spaced between the first side and the second side.
20. The MRI system of claim 18 , wherein:
the first portion of the conductor crosses over the second portion of the conductor; and
the arrangement comprises a balanced winding pattern.