Local coil system including an energy reception antenna for inductively receiving energy for the local coil system
A local coil system for detecting magnetic resonance (MR) signals in a magnetic resonance tomography (MRT) device includes an energy reception antenna for inductively receiving energy for the local coil system from a magnetic field changing over time with an energy transmission frequency. The energy reception antenna includes a conductor loop running in loop-like fashion from a first loop connection to a second loop connection. At least one path filter that blocks for harmonic frequencies of the energy transmission frequency is arranged over the course of the energy reception path, and/or at least one path filter that blocks for harmonic frequencies of the energy transmission frequency is arranged over the course of an energy reception path leading from the loop connections to a rectifier.
1. A local coil system for detecting magnetic resonance (MR) signals in a magnetic resonance tomography (MRT) device, the local coil system comprising:
an energy reception antenna operable for inductively receiving energy for the local coil system from a magnetic field changing over time with an energy transmission frequency,
wherein the energy reception antenna comprises a conductor loop running in loop-like fashion from a first loop connection to a second loop connection,
wherein at least one conductor loop filter that blocks a MR frequency of the MR signals to be detected is arranged over a course of the conductor loop,
wherein the at least one conductor loop filter comprises a plurality of conductor loop filters arranged over the course of the conductor loop with a maximum mutual spacing of a quarter-wavelength corresponding to the MR frequency.
2. The local coil system of claim 1 , wherein the conductor loop of the energy reception antenna frames an arrangement of one or more MR reception antennas of the local coil system, the arrangement being operable for receiving the MR signals.
3. The local coil system of claim 2 , wherein the at least one conductor loop filter has a bandpass characteristic operable for allowing passage of the energy transmission frequency.
4. The local coil system of claim 1 , wherein the at least one conductor loop filter has a bandpass characteristic operable for allowing passage of the energy transmission frequency.
5. The local coil system of claim 1 , further comprising:
an energy reception path that leads from conductor loop connectors of the energy reception antenna to a rectifier of the local coil system; and
at least one path filter arranged over a course of the energy reception path, the at least one path filter being operable to block harmonic frequencies of the energy transmission frequency.
6. The local coil system of claim 5 , wherein the at least one path filter has a low-pass characteristic.
7. The local coil system of claim 6 , further comprising a matching network configured for impedance conversion provided over the course of the energy reception path.
8. The local coil system of claim 7 , wherein the energy reception path is configured such that, with respect to a current flowing through the conductor loop of the energy reception antenna during energy reception, blocking of a DC component is provided.
9. The local coil system of claim 7 , wherein the rectifier is configured such that a current flows at a rectifier input for both half-cycles.
10. The local coil system of claim 6 , wherein the rectifier is configured such that a current flows at a rectifier input for both half-cycles.
11. The local coil system of claim 5 , wherein the energy reception path is configured such that, with respect to a current flowing through the conductor loop of the energy reception antenna during energy reception, blocking of a DC component is provided.
12. The local coil system of claim 11 , wherein the rectifier is configured such that a current flows at a rectifier input for both half-cycles.
13. The local coil system of claim 5 , wherein the rectifier is configured such that a current flows at a rectifier input for both half-cycles.
14. The local coil system of claim 6 , wherein the energy reception path is configured such that, with respect to a current flowing through the conductor loop of the energy reception antenna during energy reception, blocking of a DC component is provided.