Local antenna device for transmitting magnetic resonance signals

1. A local antenna device for transmitting magnetic resonance (MR) signals of a plurality of MR receiving antenna elements to an MR signal processing device, the local antenna device comprising:

a plurality of analog-to-digital converters operable to scan the MR signals and convert the MR signals to digital MR data;

a plurality of transmitting antenna elements operable to wirelessly transmit the digital MR data to the MR signal processing device by emission of an electromagnetic field;

a plurality of transmitting devices operable to trigger the plurality of transmitting antenna elements;

a substrate that supports the plurality of transmitting antenna elements; and

a plurality of spacer elements arranged on the local antenna device such that at least a defined minimum emission spacing is produced between the plurality of transmitting antenna elements and articles adjoining the local antenna device in at least one direction of a principal axis of emission of the electromagnetic field,

wherein the plurality of transmitting antenna elements are enclosed by the substrate and at least one spacer element of the plurality of spacer elements.

2. The local antenna device as claimed in claim 1 , wherein the defined minimum emission spacing corresponds substantially to the size of a near field along the principal axis of emission of the emitted electromagnetic field of the plurality of transmitting antenna elements.

3. The local antenna device as claimed in claim 1 , wherein the defined minimum emission spacing is at least 0.5 cm.

4. The local antenna device as claimed in claim 3 , wherein the defined minimum emission spacing is at least 1 cm.

5. The local antenna device as claimed in claim 1 , wherein at least one spacer element of the plurality of spacer elements comprises a foil, the foil including a plurality of dielectric materials and being in direct contact with the plurality of transmitting antenna elements or at a small spacing from the plurality of transmitting antenna elements.

6. The local antenna device as claimed in claim 1 , wherein the plurality of spacer elements is arranged such that an air gap is produced between the plurality of spacer elements and the plurality of transmitting antenna elements.

7. The local antenna device as claimed in claim 1 , wherein the plurality of spacer elements includes materials of a relative permittivity.

8. The local antenna device as claimed in claim 7 , wherein the plurality of spacer elements includes materials having a relative permittivity of less than 5.

9. The local antenna device as claimed in claim 8 , wherein the plurality of spacer elements includes materials including PTFE, HDPE, epoxy resin, or a combination thereof.

10. The local antenna device as claimed in claim 1 , wherein the plurality of spacer elements includes metallic materials.

11. The local antenna device as claimed in claim 1 , wherein the plurality of spacer elements is at least partly a component part of an outer delimitation of the local antenna device.

12. The local antenna device as claimed in claim 1 , wherein the substrate is a printed circuit board substrate,

wherein the plurality of spacer elements is connected to the printed circuit board substrate.

13. A magnetic resonance (MR) system for generating MR scans of a region of examination of an examination subject, the MR system comprising:

a plurality of local antenna devices, the plurality of local antenna devices being for transmitting MR signals of a plurality of MR receiving antenna elements to an MR signal processing device, each local antenna device of the plurality of local antenna devices comprising:

a plurality of analog-to-digital converters operable to scan the MR signals and convert the MR signals to digital MR data;

a plurality of transmitting antenna elements operable to wirelessly transmit the digital MR data to the MR signal processing device by emission of an electromagnetic field;

a plurality of transmitting devices operable to trigger the plurality of transmitting antenna elements;

a substrate that supports the plurality of transmitting antenna elements; and

a plurality of spacer elements arranged on the local antenna device such that at least a defined minimum emission spacing is produced between the plurality of transmitting antenna elements and articles adjoining the local antenna device in at least one direction of a principal axis of emission of the electromagnetic field,

wherein the plurality of transmitting antenna elements are enclosed by the substrate and at least one spacer element of the plurality of spacer elements.

14. The MR system as claimed in claim 13 , wherein the defined minimum emission spacing corresponds substantially to the size of a near field along the principal axis of emission of the emitted electromagnetic field of the plurality of transmitting antenna elements.

15. The MR system as claimed in claim 13 , wherein the defined minimum emission spacing is at least 0.5 cm.

16. The MR system as claimed in claim 13 , wherein one or more spacer elements of the plurality of spacer elements comprise a foil, the foil including a plurality of dielectric materials and being in direct contact with the plurality of transmitting antenna elements or at a small spacing from the plurality of transmitting antenna elements.

17. The MR system as claimed in claim 13 , wherein the plurality of spacer elements is arranged such that an air gap is produced between the plurality of spacer elements and the plurality of transmitting antenna elements.

18. A method for transmitting magnetic resonance (MR) signals of a number of MR receiving antenna elements of a local antenna device to an MR signal processing device, the method comprising:

scanning the MR signals and converting the MR signals to digital MR data;

transmitting the digital MR data to a plurality of transmitting devices;

wirelessly transmitting the digital MR data to the MR signal processing device by emission of an electromagnetic field through a plurality of transmitting antenna elements connected to the plurality of transmitting devices, a plurality of spacer elements being arranged on the local antenna device, such that at least a defined minimum emission spacing between the plurality of transmitting antenna elements and articles adjoining the local antenna device is provided in at least one direction of a principal axis of emission of the electromagnetic field, wherein the plurality of transmitting antenna elements are completely enclosed by the plurality of spacer elements and a printed circuit board substrate of the local antenna device, the printed circuit board substrate supporting the plurality of transmitting antenna elements.

19. The method as claimed in claim 18 , wherein the minimum emission spacing is defined such that a near field of the emitted electromagnetic field along a principal axis of emission is not substantially influenced by the articles adjoining the local antenna device, a resonant frequency of the plurality of transmitting antenna elements is not substantially influenced by the articles adjoining the local antenna device, or a combination thereof.

20. The local antenna device as claimed in claim 1 , wherein the plurality of transmitting antenna elements form conductor tracks on the substrate.