Processing movement signals during a magnetic resonance scan

Patent metadata

Field	Value
Publication number	US-10502805-B2
Application number	US-201715819067-A
Country	US
Kind code	B2
Filing date	Nov 21, 2017
Priority date	Nov 30, 2016
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

The disclosure relates to a method for processing movement signals detected during a magnetic resonance scan of a patient, and to a corresponding magnetic resonance device and a computer program product. According to the method, RF pulses are generated by a RF transmitting unit of a magnetic resonance device in order to excite nuclear spins in the body of the patient. Magnetic resonance signals are generated by the excited nuclear spins. For spatial encoding of the magnetic resonance signals, gradient pulses are generated by a gradient coil unit of the magnetic resonance device. The magnetic resonance signals are detected by a RF receiving unit of the magnetic resonance device. Furthermore, movement signals of the patient are detected by a movement detection unit during detection of the magnetic resonance signals, and these are processed by a processing unit.

First claim

The invention claimed is:

1. A method for processing movement signals detected during a magnetic resonance scan of a patient, the method comprising:
generating, by a radio frequency (RF) transmitting unit, RF pulses for exciting nuclear spins in a body of the patient;
generating magnetic resonance signals by the excited nuclear spins;
generating, by a gradient coil unit, gradient pulses for spatial encoding of the magnetic resonance signals;
detecting, by a RF receiving unit, the magnetic resonance signals;
detecting, by a movement detection unit, movement signals of the patient during the detecting of the magnetic resonance signals;
determining, by a processing unit, a first time series using the magnetic resonance signals;
determining, by the processing unit, a second time series using the movement signals;
transforming each of the first time series and the second time series from a time range into a frequency range;
determining a filter using the transformed second time series; and
filtering the transformed first time series using the determined filter.

2. The method of claim 1 , wherein one or more of the RF pulses are generated, the magnetic resonance signals are detected, or the gradient pulses are generated by taking into account the movement signals.

3. The method of claim 2 , further comprising:
synchronizing phases of the RF pulses and the RF receiving unit using the movement signals such that a relative phase between the RF pulses and the RF receiving unit is constant for moving nuclear spins in successive scan cycles.

4. The method of claim 3 , wherein the gradient pulses comprise at least one bipolar gradient pulse,
wherein one or more of an amplitude, a duration, or a direction of the at least one bipolar gradient pulse is synchronized using the movement signals.

5. The method of claim 4 , further comprising:
supplying the movement signals to a movement model; and
reconstructing the magnetic resonance signals using the movement model.

6. The method of claim 5 , further comprising:
observing a reaction of the patient to a contrast agent, observing a condition of the patient, carrying out a detection of a patient using the movement signals, or a combination thereof.

7. The method of claim 1 , further comprising:
synchronizing phases of the RF pulses and the RF receiving unit using the movement signals such that a relative phase between the RF pulses and the RF receiving unit is constant for moving nuclear spins in successive scan cycles.

8. The method of claim 1 , wherein the gradient pulses comprise at least one bipolar gradient pulse,
wherein one or more of an amplitude, a duration, or a direction of the at least one bipolar gradient pulse is synchronized using the movement signals.

9. The method of claim 1 , further comprising:
generating a plurality of magnetic resonance images using the first time series; and
determining at least one region of the plurality of magnetic resonance images in which a correlation of the second time series of the movement signals with the first time series is defined.

10. The method of claim 1 , further comprising:
supplying the movement signals to a movement model; and
reconstructing the magnetic resonance signals using the movement model.

11. The method of claim 1 , further comprising:
observing a reaction of the patient to a contrast agent, observing a condition of the patient, carrying out a detection of a patient using the movement signals, or a combination thereof.

12. A magnetic resonance device comprising:
a radio frequency (RF) transmitting unit configured to generate RF pulses for exciting nuclear spins in a body of a patient and generate magnetic resonance signals by the excited nuclear spins;
a gradient coil unit configured to generate gradient pulses for spatial encoding of the magnetic resonance signals;
a RF receiving unit configured to detect the magnetic resonance signals;
a movement detection unit configured to detect movement signals of the patient during the detecting of the magnetic resonance signals; and
a processing unit configured to:
determine a first time series using the magnetic resonance signals;
determine a second time series using the movement signals;
transform each of the first time series and the second time series from a time range into a frequency range;
determine a filter using the transformed second time series; and
filter the transformed first time series using the determined filter.

13. A magnetic resonance device comprising:
a processor; and
a computer program product having a program, the computer program product configured to be loaded directly into a storage device of the processor of the magnetic resonance device, wherein the computer program product, with the processor, cause the magnetic resonance device to:
generate RF pulses for exciting nuclear spins in a body of a patient;
generate magnetic resonance signals by the excited nuclear spins;
generate gradient pulses for spatial encoding of the magnetic resonance signals;
detect the magnetic resonance signals;
detect movement signals of the patient during the detecting of the magnetic resonance signals;
determine a first time series using the magnetic resonance signals;
determine a second time series using the movement signals;
transform each of the first time series and the second time series from a time range into a frequency range;
determine a filter using the transformed second time series; and
filter the transformed first time series using the determined filter.

Assignees

• Kartaeusch Ralf
• Hoelscher Uvo
• Siemens Healthcare Gmbh

Inventors

• Kartäusch Ralf
• Hölscher Uvo

Classifications

• G01R33/5673 Primary

  Gating or triggering based on a physiological signal other than an MR signal, e.g. ECG gating or motion monitoring using optical systems for monitoring the motion of a fiducial marker · CPC title

• G01R33/5676

  Gating or triggering based on an MR signal, e.g. involving one or more navigator echoes for motion monitoring and correction · CPC title