Method for positioning at least one local coil for recording magnetic resonance data with a magnetic resonance device and magnetic resonance system
A method for positioning at least one local coil for recording magnetic resonance data with a magnetic resonance device, wherein at least one surface data record, which describes the surface of the patient to be recorded who is already positioned for recording on a patient couch of the magnetic resonance device, is measured, the surface characteristic of the patient is extracted from the surface data record and at least one position and/or shape of at least one of the at least one local coil is chosen as a function of the surface characteristic in such a way that there is a pre-determined distance between the surface of the patient and the surface of the local coil is provided.
1. A method for positioning at least one local coil for recording magnetic resonance data with a magnetic resonance device, comprising:
measuring at least one surface data record, which describes a surface of a patient to be recorded who is already positioned for recording on a patient couch of the magnetic resonance device; extracting the surface characteristic of the patient from the surface data record and choosing at least one of a position and a shape of at least one of the at least one local coil as a function of the surface characteristic in such a way that there is a pre-determined distance between the surface of the patient and the surface of the local coil, wherein the step of choosing the positioning and adjustment of the shape of the at least one local coil is made at least partially automatically by way of at least one movement device; and further comprising arranging at least one of the at least one local coils to be positioned and shaped inside the patient-receiving device of the magnetic resonance device and has two planar, flexible elements which are secured to opposing sides of the patient-receiving device and can be displaced relative to one another in a shared guide, wherein the surface, dependent on the degree of overlapping, of the local coil, and therewith the at least one of position and shape of the local coil, is determined by the position of the elements relative to each other.
2. The method as claimed in claim 1 , wherein the step of measuring the surface data record is recorded with the magnetic resonance device, as one of a localizer and a scout scan.
3. The method as claimed in claim 1 wherein the step of measuring the surface data record is recorded with an optical 3D-camera arrangement arranged for detection of the patient, having at least one of a camera and a laser measuring device.
4. The method as claimed in claim 3 , further comprising evaluating the image data of the camera arrangement for the detection of movements of the patient.
5. The method as claimed in claim 4 , wherein the step of evaluating movement data which describes the movements of the patient in the case at least one of a repositioning, a reshaping of local coils and for movement correction in recorded magnetic resonance data.
6. The method as claimed in claim 1 , further comprising choosing at least one suitable local coil as a function of the surface characteristic.
7. The method as claimed in claim 1 , further comprising choosing the at least one local coil as a function of a target area of the patient to be recorded.
8. A method for positioning at least one local coil for recording magnetic resonance data with a magnetic resonance device, comprising:
measuring at least one surface data record, which describes a surface of a patient to be recorded who is already positioned for recording on a patient couch of the magnetic resonance device;
extracting the surface characteristic of the patient from the surface data record and choosing at least one of a position and a shape of at least one of the at least one local coil as a function of the surface characteristic in such a way that there is a pre-determined distance between the surface of the patient and the surface of the local coil, wherein the step of choosing the positioning and adjustment of the shape of the at least one local coil is made at least partially automatically by way of at least one movement device;
using at least one of a hydraulic and a pneumatic movement device as the at least one movement device for positioning at least one local coil; and
arranging at least one of the at least one local coils to be positioned and shaped inside the patient-receiving device of the magnetic resonance device and has two planar, flexible elements which are secured to opposing sides of the patient-receiving device and can be displaced relative to other in a shared guide, wherein the surface, dependent on the degree of overlapping, of the local coil, and therewith the at least one of position and shape of the local coil, is determined by the position of the elements relative to each other.
9. The method as claimed in claim 8 , wherein the step of choosing includes securing at least one of the at least one local coil to be positioned and shaped to at least one extendable holder inside the patient-receiving device of the magnetic resonance device, choosing the extendable length of the at least one extendable holder as a function of the at least one of positioning and shape determined for the local coil.
10. The method as claimed in claim 9 , further comprising leading cabling for the at least one local coil that is supported by a telescoped holder through at least one of the at least one extendable holder.
11. The method as claimed in claim 1 , comprising choosing the pre-determined distance in such a way that the signal-to-noise ratio remains above a threshold value.
12. The method as claimed in claim 1 , wherein at least one of the at least one local coils has distance sensors for measuring the distance from the surface of the patient, the measured values of which are used for plausibility checking of the at least one of position, shaping, automatic fine positioning, and within the context of an emergency program for spacing the local coils from the patient when they touch the patient.
13. The method as claimed in claim 1 , wherein at least some of the local coils that are not required are at least one of positioned laterally on and in the patient couch.
14. The method as claimed in claim 1 , further comprising using a storage space arranged at a distance from the at least one of a magnetic resonance device and a storage device for local coils arranged at a distance from the magnetic resonance device, from which the in particular automatically chosen local coils that are to be at least one of positioned and shaped are automatically conveyed to the magnetic resonance device by a conveying mechanism.
15. The method as claimed in claim 14 , wherein the conveying mechanism includes a rail system, along which the local coils are conveyed.
16. The method as claimed in claim 15 , wherein the rail system is also used as a storage device.
17. The method as claimed in claim 14 , wherein the conveying mechanism comprises an extendable arm via which the local coils are conveyed directly to the patient couch where they are at least one of manually and automatically connected.
18. The method as claimed in claim 1 , wherein on actuation of an operating element at least one movement device for positioning the local coils comprising the local coil is automatically removed from the patient.
19. A magnetic resonance system, comprising a magnetic resonance device and a local coil system having a controller designed for carrying out a method as claimed in claim 1 .