Integrated power supply for surface coils

• US 7,602,187 B2
• Filed: 06/07/2005
• Issued: 10/13/2009
• Est. Priority Date: 06/25/2004
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Findeklee, Christian, van Helvoort, Marinus J. A. M., Notten, Peter H., Tuithof, Hans H., Luedeke, Kai-Michael
• Primary Examiner(s): Shrivastav; Brij B
• Application Number:
  US11/570,893
• Publication Number:
  US 20080272786A1
• Time in Patent Office: 1,589 Days
• Field of Search: 324300-322, 600407-445
• US Class Current: 324/318
• CPC Class Codes: G01R 33/34 Constructional details, e.g. resonators , specially adapted to MR
• CPC Class Codes: G01R 33/34007 Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
• CPC Class Codes: G01R 33/34076 Birdcage coils
• CPC Class Codes: G01R 33/341 comprising surface coils
• CPC Class Codes: G01R 33/3415 comprising arrays of sub-coils , i.e. phased-array coils with flexible receiver channels
• CPC Class Codes: G01R 33/422 of the radio frequency field
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 50/24 adapted for protecting batteries from their environment, e.g. from corrosion thermal insulation H01M10/658
• CPC Class Codes: H01M 8/00 Fuel cells; Manufacture thereof
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A radio frequency receive coil for receiving a magnetic resonance signal includes a radio frequency antenna. The radio frequency antenna includes one or more electrical conductors (72, 74, 76, 78, 172, 173, 176, 180, 252, 254), at least one of which is a substantially hollow conductor (72, 78, 172, 252, 254). At least one electrical component (100, 110, 110′, 110″, 140, 160, 200) is mounted to be shielded from interfering with the MR signal by disposing it inside the substantially hollow conductor. The at least one electrical component can be, for example, a battery (100, 160, 200), a storage capacitor (140), or coil electronics (110, 110′,110″).

Claims

1. A radio frequency receive coil for receiving a magnetic resonance signal, the receive coil comprising:

a radio frequency antenna including one or more electrical conductors; and

at least one electrical component mounted to be shielded from interfering with the magnetic resonance signal by one of the electrical conductors, wherein at least one of the conductors is a substantially hollow conductor and the at least one electrical component is disposed inside the substantially hollow conductor, the substantially hollow conductor including a laminated conductive material laminated onto a printed circuit board and one of;

(i) a portion of said laminated conductive material being delaminated from the printed circuit board and folded over the at least one electrical component to enclose said at least one electrical component, and

(ii) the at least one electrical component being disposed on the laminated conductive material and a covering electrically conductive foil covering the at least one electrical component and sealed with the laminated conductive material to enclose said at least one electrical component.

2. The receive coil as set forth in claim 1, wherein the electrical conductors of the radio frequency antenna, including the at least one substantially hollow conductor, are generally planar conductors having thicknesses of less than about 5 millimeters.

3. The receive coil as set forth in claim 1, wherein the substantially hollow conductor includes:

a laminated conductive material laminated onto a printed circuit board, a portion of said laminated conductive material being delaminated from the printed circuit board and folded over the at least one electrical component to enclose said at least one electrical component.

4. The receive coil as set forth in claim 1, wherein the substantially hollow conductor includes:

a laminated conductive material laminated onto a printed circuit board, the at least one electrical component being disposed on the laminated conductive material; and

a covering electrically conductive foil covering the at least one electrical component and sealed with the laminated conductive material to enclose said at least one electrical component.

5. The A radio frequency receive coil for receiving a magnetic resonance signal, the receive coil comprising:

a radio frequency antenna including one or more electrical conductors, at least one of the electrical conductors being a substantially hollow conductor; and

at least one electrical component mounted to be shielded from interfering with the magnetic resonance signal by being disposed inside the substantially hollow conductor, the at least one electrical component including an electrical power source and powering electronics for the radio frequency antenna wherein the electrical power source includes at least one of a rechargeable battery, a fuel cell, a storage capacitor, and a replaceable battery, disposed inside the substantially hollow conductor.

6. The receive coil as set forth in claim 5, wherein the electrical conductors of the radio frequency antenna including the at least one substantially hollow conductor include a plurality of tubular conductors.

7. The receive coil as set forth in claim 5, wherein the electrical power source includes:

first and second electrodes disposed inside the substantially hollow conductor; and

an electrolyte disposed inside the substantially hollow conductor, the electrolyte together with the electrodes defining a battery.

8. The receive coil as set forth in claim 7, wherein the battery includes at least one of:

a lithium-polymer battery,

a lithium-ion battery,

a nickel-metalhalide battery; and

a magnesium-metalhalide battery.

9. The receive coil as set forth in claim 5, wherein the powering electronics include:

a circuit that (i) recharges the electrical power source and (ii) discharges the power source during the receiving of the magnetic resonance signal by the radio frequency receive coil.

10. The receive coil as set forth in claim 9, wherein the circuit recharges the electrical power source using one of:

a battery recharging system selectively coupled with the radio frequency receive coil by an RU transmission line,

a radio frequency signal produced by a radio frequency transmitter of an associated magnetic resonance imaging scanner, and

a magnetic field gradient produced by magnetic field gradient coils of the associated magnetic resonance imaging scanner.

11. A radio frequency receive coil for receiving a magnetic resonance signal, the receive coil comprising:

a radio frequency antenna including one or more electrical conductors, at least one of the electrical conductors being a substantially hollow conductor; and

at least one electrical component mounted to be shielded from interfering with the magnetic resonance signal by being disposed inside the substantially hollow conductor, wherein the at least one electrical component includes coil electronics, the substantially hollow conductor Faraday shielding the coil electronics, wherein the coil electronics includes at least one of;

an electro-.optical component outputting a modulated optical signal corresponding to the received magnetic resonance signal,

a wireless transmitter that transmits a wireless signal corresponding to the received magnetic resonance signal,

an RF cable, and

battery recharging circuitry.

12. The receive coil as set forth in claim 11, wherein the coil electronics include at least one of:

an electro-optical component outputting a modulated optical signal corresponding to the received magnetic resonance signal,

a wireless transmitter that transmits a wireless signal corresponding to the received magnetic resonance signal, and

an RF cable.

13. The receive coil as set forth in claim 11, wherein the at least one electrical component further includes:

an electrical power storage component integrated with or disposed inside the at least one substantially hollow conductor of the radio frequency antenna, the electrical power storage component providing electrical power operating the coil electronics.

14. The receive coil as set forth in claim 11, wherein the coil electronics include at least one of:

(i) a pre-amplifier,

(ii) a radio frequency balun or trap for suppressing induced currents,

(iii) detuning circuitry for detuning the coil during a radio frequency excitation operation, and

(iv) safety interlock circuitry for deactivating the receive coil responsive to a control signal.

15. The receive coil as set forth in claim 11, wherein the coil electronics include battery recharging circuitry.

16. A radio frequency receive coil for receiving a magnetic resonance signal, the receive coil comprising:

a radio frequency antenna including a plurality of electrical conductors, at least two of the electrical conductors being substantially hollow conductors; and

electrical components mounted to be shielded from interfering with the magnetic resonance signal by being disposed inside the substantially hollow conductors, the at-least electrical components including;

an electrical power source disposed in one of the hollow conductors; and

coil electronics disposed in another of the hollow conductors, the electrical power source powering the coil electronics.

17. A radio frequency receive coil for receiving a magnetic resonance signal, the receive coil comprising:

a radio frequency antenna including one or more electrical conductors; and

at least one electrical component mounted to be shielded from interfering with the magnetic resonance signal by one of the electrical conductors;

wherein the at least one electrical component includes;

two batteries;

battery recharging circuitry;

switching circuitry for connecting one battery with the coil and the other battery with the battery recharging circuitry; and

a battery state-of-charge sensor, the switching circuitry switching to another battery when the battery state-of-charge sensor indicates the operating battery is substantially fully discharged.

18. A magnetic resonance imaging scanner for imaging an imaging subject, the scanner comprising:

a main magnet generating a substantially spatially and temporally constant magnetic field in an examination region;

magnetic field gradient coils generating selected magnetic field gradients in the examination region; and

a radio frequency receive coil comprising a radio frequency antenna including one or more electrical conductors and at least one electrical component mounted to be shielded from interfering with the magnetic resonance signal b one of the electrical conductors wherein the at least one electrical component includes a battery and the scanner further includes a battery recharging system selectively coupled with the radio frequency receive coil by an RF transmission line.