Transmission arrangement for a tomograph
View Patent ↗A transmission arrangement for a tomograph, such as magnetic resonance tomography, is provided for wireless energy supply of a local coil system. The transmission arrangement includes at least one first region having at least one first antenna element. The transmission arrangement further includes at least one second region having at least one second antenna element. The at least one first region and the at least one second region are connected to one another via at least one rejector circuit.
1. A transmission arrangement for a tomograph, the transmission arrangement comprising:
a first region having at least one first antenna element, wherein the first region is configured to operate at a first operating frequency; and
a second region having at least one second antenna element, wherein the second region is configured to operate at a second operating frequency;
wherein the first region and the second region are connected to one another via a rejector circuit, wherein the rejector circuit is configured to reject the first operating frequency.
2. The transmission arrangement of claim 1 , wherein the first operating frequency is an excitation frequency for exciting a nuclear spin.
3. The transmission arrangement of claim 1 , wherein the second operating frequency is an energy input frequency to supply a local coil system with energy.
4. The transmission arrangement of claim 1 , wherein:
the first region has a plurality of first antenna elements connected to one another via tuning devices;
the tuning devices have an impedance for the second operating frequency;
a pair of second regions is adjacent to the first region on each side of the first region such that second antenna elements of each second region are connected to the second antenna elements of the other second region via a first antenna element of the first region; and
the rejector circuit is transmissive at the second operating frequency.
5. The transmission arrangement of claim 4 , wherein:
the first region is designed as a first body coil arrangement having first antenna elements arranged in parallel, with neighboring first antenna elements being connected to one another by at least two tuning devices;
the second region comprises two second body coil arrangements, each second body coil arrangement having second antenna elements arranged in parallel;
neighboring second antenna elements of the second region are connected to one another by a connecting element; and
neighboring second antenna elements of the second region are connected to one another via at least two of the first antenna elements of the first region.
6. The transmission arrangement of claim 5 , wherein:
the transmission arrangement has a cylindrical basic shape; and
the two second regions are adjacent to the first region at end faces.
7. The transmission arrangement of claim 5 , wherein the connecting element is connected to the second antenna elements via rejector circuits for the first operating frequency.
8. The transmission arrangement of claim 5 , wherein the connecting element between neighboring second antenna elements has a rejector circuit for the first operating frequency.
9. The transmission arrangement of claim 1 , further comprising a plurality of input points, the plurality of input points comprising:
a first input point at the second region;
a second input point at the first region;
a third input point at the second region; and
a fourth input point at the first region
wherein the first and third input points are offset by 90° with respect to one another.
10. The transmission arrangement of claim 9 , wherein:
the first input point and the second input point are opposite one another; and
the third input point and the fourth input point are opposite one another.
11. The transmission arrangement of claim 1 , wherein the rejector circuit is configured as a parallel resonant circuit.
12. The transmission arrangement of claim 11 , wherein the rejector circuit is provided for bridging a detuning circuit on the first region.
13. The transmission arrangement of claim 2 , wherein:
the first region has a plurality of first antenna elements connected to one another via tuning devices;
the tuning devices have an impedance for the second operating frequency;
a pair of second regions is adjacent to the first region on each side of the first region such that second antenna elements of each second region are connected to the second antenna elements of the other second region via a first antenna element of the first region; and
the rejector circuit is transmissive at the second operating frequency.
14. The transmission arrangement of claim 13 , wherein:
the first region is designed as a first body coil arrangement having first antenna elements arranged in parallel, with neighboring first antenna elements being connected to one another by at least two tuning devices;
the second region is designed as two second body coil arrangements, each second body coil arrangement having second antenna elements arranged in parallel;
neighboring second antenna elements of the second region are connected to one another by a connecting element; and
neighboring second antenna elements of the second region are connected to one another via at least two of the first antenna elements of the first region.
15. The transmission arrangement of claim 3 , wherein:
the first region has a plurality of first antenna elements connected to one another via tuning devices;
the tuning devices have an impedance for the second operating frequency;
a pair of second regions is adjacent to the first region on each side of the first region such that second antenna elements of each second region are connected to the second antenna elements of the other second region via a first antenna element of the first region; and
the rejector circuit is transmissive at the second operating frequency.
16. The transmission arrangement of claim 15 , wherein:
the first region is designed as a first body coil arrangement having first antenna elements arranged in parallel, with neighboring first antenna elements being connected to one another by at least two tuning devices;
the second region is designed as two second body coil arrangements, each second body coil arrangement having second antenna elements arranged in parallel;
neighboring second antenna elements of the second region are connected to one another by a connecting element; and
neighboring second antenna elements of the second region are connected to one another via at least two of the first antenna elements of the first region.
17. The transmission arrangement of claim 2 , further comprising a plurality of input points, the plurality of input points comprising:
a first input point at the second region;
a second input point at the first region;
a third input point at the second region; and
a fourth input point at the first region
wherein the first and third input points are offset by 90° with respect to one another.
18. A transmission arrangement for a tomograph, the transmission arrangement comprising:
at least one first region having first antenna elements; and
at least one second region having second antenna elements,
wherein the at least one first region and the at least one second region are connected to one another via at least one rejector circuit, and
wherein a number of the second antenna elements of a respective second region of the at least one second region that are arranged parallel is less than a number of the first antenna elements of a respective first region of the at least one first region that are arranged parallel.
19. A transmission arrangement for a tomograph, the transmission arrangement comprising:
a rejector circuit;
a first region having a first antenna element; and
a second region having a second antenna element separated from the first antenna element by the rejector circuit;
wherein the first region and the second region are connected to one another via the rejector circuit, and
wherein the rejector circuit is configured to prevent an operating frequency of the first region from exciting the second region.