Two-channel magnetic resonance imaging

Patent metadata

Field	Value
Publication number	US-9784811-B2
Application number	US-201214349419-A
Country	US
Kind code	B2
Filing date	Sep 12, 2012
Priority date	Oct 6, 2011
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A two-channel magnetic resonance tomography system is provided with a regulation circuit for an amplification system in order to be able to take into account different load situations of the MRI system in a flexible and efficient manner. It is thus possible to improve the MRI measurements greatly if the MRI system is set to the respective load situation beforehand by an idle state measurement. The adaptation may optionally also be carried out during the MRI measurement. Therefore, a multiplicity of completely different load situations may be taken into account in an optimized manner by the regulation circuit.

First claim

The invention claimed is:

1. A method for setting an amplification system for a two-channel magnetic resonance imaging system, the method comprising:
determining a load situation, by the amplification system, with aid of an open-loop measurement; and
adapting the amplification system by a control circuit, wherein the amplification system is adapted by the control circuit depending on the load situation.

2. The method as claimed in claim 1 , wherein the control circuit has a feedback of an output signal of the amplification system to an input of the amplification system.

3. The method as claimed in claim 2 , further comprising:
setting, with the amplification system, at least one controller of the two-channel magnetic resonance imaging system depending on the load situation.

4. The method as claimed in claim 2 , further comprising:
carrying out a delay of the output signal out during the feedback.

5. The method as claimed in claim 4 , further comprising:
setting, with the amplification system, at least one controller of the two-channel magnetic resonance imaging system depending on the load situation.

6. The method as claimed in claim 1 , further comprising:
setting, with the amplification system, at least one controller of the two-channel magnetic resonance imaging system depending on the load situation.

7. The method as claimed in claim 6 , wherein the at least one controller comprises a load-dependent feedforward controller for setting an amplification of the amplification system.

8. The method as claimed in claim 7 , wherein the at least one controller comprises a further load-dependent controller having four Single Input Single Output (SISO) proportional-integral (PI) controllers.

9. The method as claimed in claim 6 , wherein the at least one controller comprises a further load-dependent controller having four Single Input Single Output (SISO) proportional-integral (PI) controllers.

10. The method as claimed in claim 1 , further comprising:
decoupling signals upstream of the amplification system.

11. The method as claimed in claim 1 , wherein the load situation is determined on the basis of at least one of the following parameters:
a size of a patient;
a weight of the patient;
a region or an organ to be examined;
a position of an examination table;
a position of a body coil for carrying out a magnetic resonance imaging (MRI) measurement; or
a position of the patient in relation to the examination table.

12. The method as claimed in claim 1 , further comprising:
carrying out the setting of the amplification system during the open-loop measurement.

13. The method as claimed in claim 12 , further comprising:
carrying out a magnetic resonance imaging (MRI) measurement with the patient after the open-loop measurement.

14. The method as claimed in claim 13 , wherein the control circuit is adapted during the MRI measurement.

15. An apparatus for driving a two-channel magnetic resonance imaging system, the apparatus comprising:
a control circuit;
an amplification system configured to determine a load situation with aid of an open-loop measurement,
wherein the amplification system is adaptable by the control circuit depending on the load situation.

16. The apparatus as claimed in claim 15 , wherein the control circuit has a feedback of an output signal of the amplification system to an input of the amplification system.

17. The apparatus as claimed in claim 15 , wherein at least one controller is provided in a feedforward branch of the control circuit, wherein with aid of the at least one controller, an amplification of the amplification system is settable and a settling time of the amplification system is settable.

18. A two-channel magnetic resonance imaging system comprising:
an amplification system having a control circuit and at least one controller,
wherein the amplification system is configured to determine a load situation with aid of an open-loop measurement,
wherein the amplification system is adaptable by the control circuit depending on the load situation,
wherein the control circuit has a feedback of an output signal of the amplification system to an input of the amplification system, and
wherein the at least one controller is provided in a feedforward branch of the control circuit, wherein with the at least one controller, an amplification of the amplification system is settable and a settling time of the amplification system is settable.

Assignees

• Chen Chih-Chung
• Huber Klaus
• Reinschke Johannes
• Seisenberger Claus
• Vester Markus
• WüNSCH CHRISTIAN
• Siemens Ag

Inventors

• Chen Chih-Chung
• Huber Klaus
• Reinschke Johannes
• Seisenberger Claus
• Vester Markus
• WüNSCH CHRISTIAN

Classifications

• A61B5/055

  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging · CPC title

• G01R33/543 Primary

  Control of the operation of the MR system, e.g. setting of acquisition parameters prior to or during MR data acquisition, dynamic shimming, use of one or more scout images for scan plane prescription (G01R33/546 takes precedence) · CPC title

• G01R33/365

  Decoupling of multiple RF coils wherein the multiple RF coils have the same function in MR, e.g. decoupling of a receive coil from another receive coil in a receive coil array, decoupling of a transmission coil from another transmission coil in a transmission coil array · CPC title

• G01R33/3614 Primary

  RF power amplifiers · CPC title

• A61B5/7225

  Details of analogue processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation (input circuits for detecting, measuring, or recording bioelectric or biomagnetic signals A61B5/30; specific diagnostic methods using bioelectric or biomagnetic signals A61B5/316) · CPC title