System and method for inductively communicating data

Patent metadata

Field	Value
Publication number	US-9513352-B2
Application number	US-201213629636-A
Country	US
Kind code	B2
Filing date	Sep 28, 2012
Priority date	Sep 28, 2012
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A system for inductively communicating signals in a magnetic resonance imaging system is presented. The system includes first array of primary coils configured to acquire data from a patient positioned on a patient cradle. Furthermore, the system includes a second array of secondary coils operatively coupled to the first array of primary coils. Moreover, the system includes a third array of tertiary coils disposed at a determined distance from the second array of secondary coils. In addition, the system includes a tuning unit operatively coupled to the third array of tertiary coils by a cable having a quarter-wave electrical wavelength and configured to control the first array of primary coils through impedance transformation, where the second array of secondary coils is configured to inductively communicate the acquired data to the third array of tertiary coils.

First claim

The invention claimed is:

1. A system for inductively communicating signals in a magnetic resonance imaging system, the system comprising:
a first array of primary coils configured to acquire data from a patient positioned on a patient cradle;
a second array of secondary coils operatively coupled to the first array of primary coils;
a third array of tertiary coils disposed at a determined distance from the second array of secondary coils; and
a tuning unit operatively coupled to the third array of tertiary coils by a cable having a quarter-wave electrical wavelength and configured to control the first array of primary coils through impedance transformation,
wherein the second array of secondary coils is configured to inductively communicate the acquired data to the third array of tertiary coils.

2. The system of claim 1 , wherein the first array of primary coils is disposed on or embedded in a flexible substrate.

3. The system of claim 2 , wherein the second array of secondary coils is disposed on or embedded in the flexible substrate and operatively coupled to the first array of primary coils via a first set of cables.

4. The system of claim 1 , wherein the first array of primary coils is disposed on a patient, disposed on or embedded in the patient cradle such that the first array of primary coils is disposed directly under the patient, or combinations thereof.

5. The system of claim 1 , wherein the first array of primary coils, the second array of secondary coils and the first set of cables form an array of coil assemblies.

6. The system of claim 5 , wherein each coil assembly in the array of coil assemblies is tuned to the Larmor frequency.

7. The system of claim 1 , wherein the determined distance comprises an air gap between the secondary coils and the tertiary coils.

8. The system of claim 1 , wherein the patient cradle comprises a housing configured to house the tertiary coils.

9. The system of claim 8 , further comprising one or more slots formed on the housing.

10. The system of claim 9 , wherein the second array of secondary coils is fixably coupled to the one or more slots on the housing to align the secondary coils with the tertiary coils.

11. The system of claim 10 , wherein the second array of secondary coils and the third array of tertiary coils are configured to move with the patient cradle.

12. The system of claim 1 , wherein the tertiary coils are positioned at a fixed location underneath the patient cradle.

13. The system of claim 1 , further comprising an attenuating unit operatively coupled to the third array of tertiary coils and configured to attenuate common mode signals.

14. The system of claim 1 , wherein the secondary coils are configured to receive signals from at least one subset of primary coils.

15. The system of claim 14 , wherein the second array of secondary coils is configured to inductively transmit the data received from the at least one subset of primary coils to the tertiary coils across the determined distance.

16. The system of claim 15 , wherein the third array of tertiary coils is configured to communicate the signals received from the second array of secondary coils to receivers in the imaging system.

17. The system of claim 1 , wherein the tuning unit comprises a diode and a low input impedance preamplifier.

18. The system of claim 1 , wherein the tuning unit is configured to detune the primary coils during radio-frequency transmission via wireless active blocking.

19. The system of claim 1 , wherein the tuning unit is configured to reduce cross-talk across the primary coils during radio-frequency signal reception via wireless preamplifier decoupling.

20. A method for inductively communicating signals in a magnetic resonance imaging system, the method comprising:
disposing a first array of primary coils on or about a patient, wherein the first array of primary coils is configured to acquire signals from the patient positioned on a patient cradle;
operatively coupling a second array of secondary coils to the first array of primary coils;
disposing a third array of tertiary coils on the patient cradle such that the third array of tertiary coils is disposed at a determined distance from the second array of secondary coils; and
inductively communicating the signals acquired by the first array of primary coils from the second array of secondary coils to the third array of tertiary coils;
further comprising controlling the primary coils during radio-frequency transmission and signal reception via impedance transformation of the tertiary coils.

21. The method of claim 20 , wherein disposing the first array of primary coils comprises arranging the primary coils on or embedding the primary coils in a flexible substrate.

22. The method of claim 21 , further comprising disposing the second array of secondary coils along an edge of the flexible substrate and operatively coupling the secondary coils to the primary coils via a first set of cables.

23. The method of claim 20 , further comprising:
forming one or one or more slots on a housing disposed on the patient cradle and configured to house the tertiary coils; and
fixably coupling the secondary coils to the one or more slots to align the secondary coils with the tertiary coils,
wherein the secondary coils and the tertiary coils are configured to move with the patient cradle.

24. The method of claim 20 , wherein the secondary coils are configured to receive signals from at least one subset of the primary coils.

25. The method of claim 20 , wherein controlling the primary coils comprises detuning the primary coils during radio-frequency transmission via wireless active blocking.

26. The method of claim 20 , wherein controlling the primary coils comprises reducing cross-talk across the primary coils during radio-frequency signal reception via wireless preamplifier decoupling.

27. The method of claim 20 , further comprising coupling the tertiary coils in the third array of tertiary coils to preamplifiers to amplify the received signals.

28. The method of claim 27 , further comprising communicating outputs of the preamplifiers to one or more receivers in the imaging system.

29. A system for magnetic resonance imaging, comprising:
an acquisition subsystem configured to acquire image data, wherein the acquisition subsystem comprises:
a subsystem for inductively communicating data signals in the imaging system, the subsystem comprising:
a first array of primary coils configured to acquire data from a patient positioned on a patient cradle;
a second array of secondary coils operatively coupled to the first array of primary coils;
a third array of tertiary coils disposed at a determined distance from the second array of secondary coils;
a tuning unit operatively coupled to the third array of tertiary coils by a cable having a quarter-wave electrical wavelength and configured to control the first array of primary coils through impedance transformation,
wherein the second array of secondary coils is configured to inductively communicate the acquired data to the third array of tertiary coils; and
a processing subsystem in operative association with the acquisition subsystem and configured to process the acquired image data.

30. The system of claim 29 , wherein the tuning unit is configured to control the primary coils by:

Assignees

• Gen Electric

Inventors

• Bulumulla Selaka Bandara
• Hardy Christopher Judson
• Sathyamurthy Karthikeyan Veeraswamy

Classifications

• G01R33/3642 Primary

  Mutual coupling or decoupling of multiple coils, e.g. decoupling of a receive coil from a transmission coil, or intentional coupling of RF coils, e.g. for RF magnetic field amplification · CPC title

• G01R33/3415

  comprising arrays of sub-coils {, i.e. phased-array coils with flexible receiver channels} · CPC title

• G01R33/3692

  involving signal transmission without using electrically conductive connections, e.g. wireless communication or optical communication of the MR signal or an auxiliary signal other than the MR signal · CPC title