Quantum sensor-based receiving unit configured for acquiring MR signals

Patent metadata

Field	Value
Publication number	US-11519983-B2
Application number	US-202117363556-A
Country	US
Kind code	B2
Filing date	Jun 30, 2021
Priority date	Jun 30, 2020
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

The disclosure relates to a receiving unit configured for acquiring MR signals from an examination object in a magnetic resonance device. The receiving unit may include a detector unit comprising a light source and a first optical detector, a sensor unit comprising a first optical magnetometer, a first optical waveguide connecting the sensor unit to the light source, and a second optical waveguide connecting the sensor unit to the first optical detector.

First claim

What is claimed is:

1. A receiver configured to acquire magnetic resonance (MR) signals from an examination object in a MR device, comprising:
detector circuitry comprising a light source and a first optical detector;
sensor circuitry comprising a first optical magnetometer;
a first optical waveguide configured to connect the sensor circuitry to the light source; and
a second optical waveguide configured to connect the sensor circuitry to the first optical detector,
wherein the first optical magnetometer comprises spins and is configured to align the spins in the presence of initial light generated by the light source, and to generate a modified light that is indicative of an MR signal occurring in a sensitivity range about a first position of the first optical magnetometer,
wherein the first optical detector is configured to acquire the modified light,
wherein the sensor circuitry comprises at least three further optical magnetometers in addition to the first optical magnetometer to form at least four optical magnetometers, the at least four magnetometers being arranged at four mutually different positions, and
wherein each of the at least four optical magnetometers comprises spins and is configured to align the spins in the presence of initial light generated by the light source, and to generate a respective further modified light, the further modified light being indicative of an MR signal occurring in a sensitivity range about each respective position of each one of the at least four optical magnetometers.

2. The receiver as claimed in claim 1 ,
wherein the detector circuitry is spaced apart from the sensor circuitry by at least 0.3 meters.

3. The receiver as claimed in claim 1 , wherein one of the sensor circuitry and the optical magnetometer is free from a macroscopic quantity of metal.

4. The receiver as claimed in claim 1 ,
wherein the second optical waveguide comprises at least four second individual optical waveguides, and
wherein each one of the at least four optical magnetometers is separately connected to the detector circuitry via a respective one of the second individual optical waveguides.

5. The receiver as claimed in claim 1 ,
wherein the first optical waveguide comprises at least one optical splitter.

6. The receiver as claimed in claim 1 ,
wherein the at least four magnetometers are flexibly connected to one another.

7. The receiver as claimed in claim 1 ,
wherein the first optical magnetometer is configured as an atomic vapor cell magnetometer.

8. The receiver as claimed in claim 7 ,
wherein the first optical waveguide comprises at least two partial waveguides,
wherein a first one of the at least two partial waveguides is configured to transfer light to the atomic vapor cell magnetometer for optical pumping, and
wherein a second one of the at least two partial waveguides is configured to transfer polarized light to the atomic vapor cell magnetometer.

9. The receiver as claimed in claim 1 , wherein the first optical magnetometer comprises a crystal having a vacancy center.

10. The receiver as claimed in claim 1 , further comprising:
a frequency filter configured as an interference filter and/or a dichroic mirror, the frequency filter being arranged between the first optical magnetometer and the first optical detector.

11. The receiver as claimed in claim 1 , further comprising:
one or more antennas configured to generate microwaves; and
a waveguide connected to the one or more antennas and at least partially surrounding the first optical magnetometer.

12. The receiver as claimed in claim 11 , wherein the one or more antennas are configured as part of the detector circuitry.

13. The receiver as claimed in claim 11 , wherein the waveguide comprises a dielectric waveguide and a dielectric resonator.

14. The receiver as claimed in claim 13 , wherein the dielectric waveguide and the dielectric resonator are coupled to one another via a gap.

15. The receiver as claimed in claim 11 , wherein the waveguide is arranged at least partially parallel to the first optical waveguide.

16. The receiver as claimed in claim 1 , wherein the receiver is configured to acquire the MR signals that are generated by a magnetic resonance device having a main magnet field strength of not more than 0.05 tesla.

17. A magnetic resonance (MR) system, comprising:
a MR device arranged in a radio frequency (RF)-screened room;
control circuitry arranged outside the RF-screened room; and
a receiver configured to acquire MR signals from an examination object in the MR device, the receiver including:
detector circuitry comprising a light source and a first optical detector;
sensor circuitry comprising a first optical magnetometer;
a first optical waveguide configured to connect the sensor circuitry to the light source; and
a second optical waveguide configured to connect the sensor circuitry to the first optical detector,
the first optical magnetometer comprising spins and being configured to align the spins in the presence of initial light generated by the light source, and to generate a modified light that is indicative of an MR signal occurring in a sensitivity range about a first position of the first optical magnetometer, the first optical detector being configured to acquire the modified light,

wherein the sensor circuitry is arranged within the RF-screened room,
wherein the detector circuitry is arranged outside the RF-screened room, and
wherein the first optical waveguide comprises at least one optical splitter.

18. The MR system as claimed in claim 17 ,
wherein the MR device comprises a main magnet configured to generate a static main magnet field having a main magnet field strength of not more than 0.05 tesla.

19. A receiver configured to acquire magnetic resonance (MR) signals from an examination object in a MR device, comprising:
detector circuitry comprising a light source and a first optical detector;
sensor circuitry comprising a first optical magnetometer;
a first optical waveguide configured to connect the sensor circuitry to the light source; and
a second optical waveguide configured to connect the sensor circuitry to the first optical detector,
wherein the first optical magnetometer comprises spins and is configured to align the spins in the presence of initial light generated by the light source, and to generate a modified light that is indicative of an MR signal occurring in a sensitivity range about a first position of the first optical magnetometer,
wherein the first optical detector is configured to acquire the modified light,
wherein the first optical magnetometer is configured as an atomic vapor cell magnetometer,
wherein the first optical waveguide comprises at least two partial waveguides,
wherein a first one of the at least two partial waveguides is configured to transfer light to the atomic vapor cell magnetometer for optical pumping, and
wherein a second one of the at least two partial waveguides is configured to transfer polarized light to the atomic vapor cell magnetometer.

20. The receiver as claimed in claim 19 , further comprising:
a frequency filter configured as an interference filter and/or a dichroic mirror, the frequency filter being arranged between the first optical magnetometer and the first optical detector.

21. The receiver as claimed in claim 19 , further comprising:
one or more antennas configured to generate microwaves; and
a waveguide connected to the one or more antennas and at least partiall

Assignees

• Siemens Healthcare Gmbh

Inventors

• Arroyo Camejo Silvia Bettina
• Popescu Stefan
• Vester Markus

Classifications

• G01R33/3621 Primary

  NMR receivers or demodulators, e.g. preamplifiers, means for frequency modulation of the MR signal using a digital down converter, means for analog to digital conversion [ADC] or for filtering or processing of the MR signal such as bandpass filtering, resampling, decimation or interpolation · CPC title

• G01R33/445

  MR involving a non-standard magnetic field B0, e.g. of low magnitude as in the earth's magnetic field or in nanoTesla spectroscopy, comprising a polarizing magnetic field for pre-polarisation, B0 with a temporal variation of its magnitude or direction such as field cycling of B0 or rotation of the direction of B0, or spatially inhomogeneous B0 like in fringe-field MR or in stray-field imaging · CPC title

• G01R33/26

  using optical pumping · CPC title

• G01R33/543

  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

• G01R33/323 Primary

  Detection of MR without the use of RF or microwaves, e.g. force-detected MR, thermally detected MR, MR detection via electrical conductivity, optically detected MR · CPC title