Magnetic resonance system

• US 8,547,098 B2
• Filed: 03/18/2011
• Issued: 10/01/2013
• Est. Priority Date: 03/23/2010
• Status: Active Grant

• Current Assignee: Siemens Healthineers AG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Biber, Stephan
• Primary Examiner(s): SHRIVASTAV, BRIJ B
• Application Number:
  US13/051,239
• Publication Number:
  US 20110234229A1
• Time in Patent Office: 928 Days
• Field of Search: 324300-322, 600407-445
• US Class Current: 324/307
• 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 33/3685 Means for reducing sheath currents, e.g. RF traps, baluns

Abstract

A magnetic resonance system includes at least one coil and at least one coaxial line connecting the at least one coil to an electronic receive system. The at least one coil includes a preprocessing device that converts the received signals to at least one transmission frequency that is different from a transmit frequency. The coaxial line includes at least one sheath wave barrier with a trap suppressing sheath waves of transmit frequency both on the outside and the inside of a sheath conductor of the coaxial line.

Claims

1. A magnetic resonance system comprising:

a coil comprising a preprocessing device that converts received signals to a transmission frequency that is different from a transmit frequency; and

a coaxial line connecting the coil to an electronic receive system,

wherein the coaxial line comprises a sheath wave barrier with a trap suppressing sheath waves of the transmit frequency on an outside and an inside of a sheath conductor of the coaxial line.

2. The magnetic resonance system as claimed in claim 1, wherein the preprocessing device is configured to convert the received signals to an intermediate frequency, digitize the received signals, or convert the received signals to the intermediate frequency and digitize the received signals.

3. The magnetic resonance system as claimed in claim 1, wherein the sheath conductor is split at the sheath wave barrier for connection to the trap.

4. The magnetic resonance system as claimed in claim 1, wherein the trap is connected as part of the sheath wave barrier in an inner conductor of the coaxial line.

5. The magnetic resonance system as claimed in claim 1, wherein the coil is a first coil, and

wherein the trap comprises a filter network with a second coil and a capacitor or the trap is provided on a printed circuit board.

10. The magnetic resonance system as claimed in claim 2, wherein the sheath conductor is split at the sheath wave barrier for connection to the trap.

11. The magnetic resonance system as claimed in claim 2, wherein the trap is connected as part of the sheath wave barrier in an inner conductor of the coaxial line.

12. The magnetic resonance system as claimed in claim 3, wherein the trap is connected as part of the sheath wave barrier in an inner conductor of the coaxial line.

13. The magnetic resonance system as claimed in claim 2, wherein the coil is a first coil, and

wherein the trap comprises a filter network with a second coil and a capacitor or the trap is provided on a printed circuit board.

14. The magnetic resonance system as claimed in claim 3, wherein the coil is a first coil, and

wherein the trap comprises a filter network with a second coil and a capacitor or the trap is provided on a printed circuit board.

15. The magnetic resonance system as claimed in claim 4, wherein the coil is a first coil, and

wherein the trap comprises a filter network with a second coil and a capacitor or the trap is provided on a printed circuit board.

6. A coaxial line for a magnetic resonance system for connecting a local coil to an electronic receive system, the local coil comprising a preprocessing device that converts received signals to a transmission frequency that is different from a transmit frequency, the coaxial line comprising:

a sheath wave barrier with a trap suppressing sheath waves of the transmit frequency on an outside and an inside of a sheath conductor of the coaxial line.

7. The coaxial line as claimed in claim 6, wherein the sheath conductor is split at the sheath wave barrier for connection to the trap.

8. The coaxial line as claimed in claim 6, wherein the trap is connected as part of the sheath wave barrier in an inner conductor of the coaxial line.

9. The coaxial line as claimed in claim 6, wherein the coil is a first coil, and

wherein the trap comprises a filter network with a second coil and a capacitor, the trap is provided on a printed circuit board, or the trap comprises the filter network with the second coil and the capacitor and the trap is provided on the printed circuit board.

16. The coaxial line as claimed in claim 7, wherein the trap is connected as part of the sheath wave barrier in an inner conductor of the coaxial line.

17. The coaxial line as claimed in claim 7, wherein the coil is a first coil, and

wherein the trap comprises a filter network with a second coil and a capacitor, the trap is provided on a printed circuit board, or the trap comprises the filter network with the second coil and the capacitor and the trap is provided on the printed circuit board.

18. The coaxial line as claimed in claim 8, wherein the coil is a first coil, and

wherein the trap comprises a filter network with a second coil and a capacitor, the trap is provided on a printed circuit board, or the trap comprises the filter network with the second coil and the capacitor and the trap is provided on the printed circuit board.