Radio frequency surface coil and magnetic resonance device employing the same
A radio frequency (RF) surface coil and a magnetic resonance device employing the same are disclosed. The disclosed RF surface coil for the magnetic resonance device comprises: a plurality of conductor elements connected in series so as to form a loop-shaped surface coil; and a variable inductance unit provided in at least one of the plurality of conductor elements so as to adjust inductance, wherein the variable inductance unit comprises a conductor bar and a coupler for attachably/detachably coupling the conductor bar to/from at least one of the plurality of conductor elements.
1. A radio frequency (RF) surface coil for a magnetic resonance device, the RF surface coil comprising:
a plurality of conductor elements connected in series to form a loop-shaped surface coil; and
a variable inductance unit provided in at least one of the plurality of conductor elements to adjust inductance,
wherein the variable inductance unit comprises a conductor bar and a coupler for attachably/detachably coupling end portions of the conductor bar to at least one of the plurality of conductor elements.
2. The RF surface coil of claim 1 , wherein the coupler comprises a plurality of coupling positions, to which the conductor bar is attachably/detachably coupled.
3. The RF surface coil of claim 2 , wherein the conductor bar is positioned parallel to, or diagonally coupled to, the plurality of coupling positions.
4. The RF surface coil of claim 1 , wherein the conductor bar has a linear shape, a bent shape, or a curved shape.
5. The RF surface coil of claim 1 , wherein the conductor bar is connected in series to at least one of the plurality of conductor elements.
6. The RF surface coil of claim 5 , wherein the at least one of the plurality of conductor elements comprises conductive plates spaced apart from each other,
the coupler comprises first and second couplers provided at facing end portions of the conductive plates, and
the conductor bar is connected in series to the conductive plates by being attachably/detachably coupled to the first and second couplers.
7. The RF surface coil of claim 1 , wherein the conductor bar is connected in parallel to at least one of the plurality of conductor elements.
8. The RF surface coil of claim 7 , wherein the at least one of the plurality of conductor elements comprises a conductive plate,
the coupler comprises first and second couplers provided at a side portion of the conductive plate, and
the conductor bar is connected in parallel to the conductive plate by being attachably/detachably coupled to the first and second couplers.
9. The RF surface coil of claim 1 , wherein the coupler is a recess region, which allows the conductor bar to be attachably/detachably coupled thereto, or a fastening hole, which allows the conductor bar to be fastened thereto by a bolt.
10. The RF surface coil of claim 1 , further comprising at least one tuning capacitor positioned between at least some of the plurality of conductor elements to adjust capacitance.
11. The RF surface coil of claim 10 , wherein the tuning capacitor is a variable capacitor with a variable capacitance.
12. The RF surface coil of claim 1 , wherein the loop-shaped surface coil formed by the plurality of conductor elements is one of rectangular, circular, and hexagonal loop-shaped surface coils.
13. The RF surface coil of claim 1 , comprising a loop coil array in which a plurality of loop-shaped surface coils are arranged,
wherein at least some of the plurality of loop-shaped surface coils comprise the variable inductance unit.
14. The RF surface coil of claim 13 , further comprising a decoupling device positioned between the plurality of loop-shaped surface coils to prevent the plurality of loop-shaped surface coils from magnetically interacting with each other.
15. The RF surface coil of claim 13 , wherein the plurality of loop-shaped surface coils are independently operated.
16. A magnetic resonance device, comprising:
a main magnet; and
a radio frequency (RF) surface coil comprising
a plurality of conductor elements connected in series to form a loop-shaped surface coil, and
a variable inductance unit provided in at least one of the plurality of conductor elements to adjust inductance,
wherein the variable inductance unit comprises a conductor bar and a coupler for attachably/detachably coupling end portions of the conductor bar to at least one of the plurality of conductor elements.
17. The magnetic resonance device of claim 16 , wherein the RF surface coil is a transmission coil for transmitting an RF signal, a reception coil for receiving a magnetic resonance signal induced in a subject, or a transceiving coil for transmitting an RF signal and receiving a magnetic resonance signal induced in a subject.
18. The magnetic resonance device of claim 16 , wherein the magnetic resonance device is a magnetic resonance imaging device, and
the RF surface coil is a surface type RF coil or a local volume type RF coil provided near the subject.
19. The magnetic resonance device of claim 18 , further comprising,
a body type RF coil;
a gradient magnetic field coil; and
a cylindrical housing, in which the main magnet, the body type RF coil, and the gradient magnetic field coil are mounted.
20. The magnetic resonance device of claim 16 , wherein the coupler comprises a plurality of coupling positions, to which the conductor bar is attachably/detachably coupled.