Local transmit coil with integrated safety device

Patent metadata

Field	Value
Publication number	US-10197644-B2
Application number	US-201615266042-A
Country	US
Kind code	B2
Filing date	Sep 15, 2016
Priority date	Sep 16, 2015
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A local transmit coil for a magnetic resonance tomograph is provided. The local transmit coil includes a signal transmission device for signal transmission to the magnetic resonance tomograph, and a transmission antenna for generating a magnetic excitation field. The local transmit coil further includes an evaluation device for monitoring a function of the local transmit coil. The evaluation device is configured to transmit a status signal relating to the local transmit coil via the signal transmission device.

First claim

The invention claimed is:

1. A local transmit coil for a magnetic resonance tomograph, the local transmit coil comprising:
a signal transmission device configured to transmit a signal to the magnetic resonance tomograph;
a transmitting antenna configured to generate a magnetic excitation field;
an evaluation device configured to monitor a function of the local transmit coil and to transmit a status signal from the local transmit coil via the signal transmission device; and
a magnetic field sensor configured to detect the magnetic excitation field,
wherein the evaluation device is in signal connection with the magnetic field sensor.

2. The local transmit coil of claim 1 , wherein the evaluation device is further configured to detect a malfunction and to transmit the status signal, which relates to the malfunction.

3. The local transmit coil of claim 2 , wherein the malfunction is an exceeding of a predetermined threshold value for a value derived from the magnetic excitation field.

4. The local transmit coil of claim 2 , wherein the malfunction is a malfunction of the magnetic field sensor, the evaluation device, or the magnetic field sensor and the evaluation device.

5. The local transmit coil of claim 1 , wherein the signal transmission device comprises:
a plug, wherein the status signal is transmitted via a contact in the plug.

6. A magnetic resonance tomograph for use with a local transmit coil, the magnetic resonance tomograph comprising:
a receiving device configured to receive a status signal from the local transmit coil; and
a controller configured to control an image acquisition by the magnetic resonance tomograph,
wherein the controller is configured to:
operate the magnetic resonance tomograph in a safe image acquisition mode that does not exceed predetermined values for a magnetic excitation field; and
enable running of the safe image acquisition mode as a function of a status signal received by the local transmit coil,

wherein the local transmit coil comprises a magnetic field sensor configured to detect the magnetic excitation field, and
wherein the magnetic field sensor is in signal connection with an evaluation device.

7. The magnetic resonance tomograph of claim 6 , wherein the receiving device comprises a socket, and the magnetic resonance tomograph is configured to receive the status signal via a contact in the socket.

8. The magnetic resonance tomograph of claim 7 , wherein the receiving device is configured to receive only the status signal via the contact in the socket.

9. The magnetic resonance tomograph of claim 6 , wherein the
evaluation device is configured to detect a malfunction and to transmit a status signal relating to the malfunction.

10. The magnetic resonance tomograph of claim 9 , wherein the malfunction is an exceeding of a predetermined threshold value for a value derived from the magnetic excitation field.

11. The magnetic resonance tomograph of claim 9 , wherein the malfunction is a malfunction of the magnetic field sensor, the evaluation device, or the magnetic field sensor and the evaluation device.

12. A system comprising:
a local transmit coil comprising:
a signal transmission device configured to transmit a signal to a magnetic resonance tomograph;
a transmitting antenna configured to generate a magnetic excitation field;
an evaluation device configured to monitor a function of the local transmit coil and to transmit a status signal from the local transmit coil via the signal transmission device; and
a magnetic field sensor configured to detect the magnetic excitation field, wherein the evaluation device is in signal connection with the magnetic field sensor,

a magnetic resonance tomograph comprising:
a receiving device configured to receive the status signal from the local transmit coil; and
a controller configured to:
control an image acquisition of the magnetic resonance tomograph;
operate the magnetic resonance tomograph in a safe image acquisition mode that does not exceed predetermined values for the magnetic excitation field; and
run the safe image acquisition mode as a function of a status signal received from the local transmit coil.

13. The system of claim 12 , wherein the
evaluation device is configured to detect a malfunction and to transmit a status signal relating to the malfunction.

14. The system of claim 13 , wherein the malfunction is an exceeding of a predetermined threshold value for a value derived from the magnetic excitation field.

15. The system of claim 13 , wherein the malfunction is a malfunction of the magnetic field sensor, the evaluation device, or the magnetic field sensor and the evaluation device.

Assignees

• Demharter Nikolaus
• Vester Markus
• Weissenberger Volker
• Siemens Healthcare Gmbh

Inventors

• Demharter Nikolaus
• Vester Markus
• Weissenberger Volker

Classifications

• G01R33/34046

  Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils · 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

• G01R33/36

  Electrical details, e.g. matching or coupling of the coil to the receiver · CPC title

• G01R33/34076

  Birdcage coils · CPC title

• G01R33/288

  Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room · CPC title