# US 10,502,805 B2 · Processing movement signals during a magnetic resonance scan

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- Number: US 10,502,805 B2
- Document ID: US10502805B2
- Status: Granted
- Kind: B2
- Application number: 15/819,067
- Filed: 2017-11-21
- Published: 2018-05-31
- Granted: 2019-12-10
- Earliest claimed: 2016-11-30
- Assignees: Siemens Healthcare GmbH
- Applicants: Ralf Kartäusch; Uvo Hölscher
- Inventors: Ralf Kartäusch; Uvo Hölscher
- Web page: https://patentgrep.com/patent/US10502805B2

## CPC

- G01R 33/5673: {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}
- G01R 33/5676: {Gating or triggering based on an MR signal, e.g. involving one or more navigator echoes for motion monitoring and correction}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 2)

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.

### Claim 4 (depends on 3)

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.

### Claim 5 (depends on 4)

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.

### Claim 6 (depends on 5)

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.

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 1)

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.

### Claim 11 (depends on 1)

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.

### Claim 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.

### Claim 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.