Method for acquiring a magnetic resonance data set, data storage medium, computer program product, and magnetic resonance system

Patent metadata

Field	Value
Publication number	US-11353534-B2
Application number	US-202016950895-A
Country	US
Kind code	B2
Filing date	Nov 17, 2020
Priority date	Nov 20, 2019
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

A method for acquiring a magnetic resonance data set of an object under examination by a magnetic resonance system using a scan sequence is provided. The scan sequence includes a succession of sequence blocks, and in each sequence block, there is at least one sub-block including an excitation section and/or a detection section. An excitation section includes at least one excitation pulse, and in a detection section, an echo signal or an echo train is acquired as a scan signal. At least one item of motion information is provided for each sub-block. The motion information contains information about a movement of the object under examination within a duration of the sub-block. Some of the sub-blocks are automatically repeated. At least the sub-blocks having motion information that exceeds a threshold value are repeated. The threshold value defines a motion amplitude.

First claim

The invention claimed is:

1. A method for acquiring a magnetic resonance data set of an object under examination by a magnetic resonance system using a scan sequence, wherein the scan sequence comprises a sequence of sequence blocks, and each sequence block of the sequence of sequence blocks contains at least one sub-block comprising an excitation section, a detection section, or the excitation section and the detection section, wherein the excitation section comprises at least one excitation pulse, the method comprising:
acquiring, in a respective detection section, an echo signal or an echo train as a scan signal,
wherein at least one item of motion information is provided for each sub-block,
wherein the motion information contains information about movement of the object under examination within a duration of the respective sub-block,
wherein some of the sub-blocks are repeatedly acquired automatically based on the motion information contained in the respective sub-blocks, and
wherein at least the sub-blocks having motion information that indicates motion that results in a motion artifact in an image data set reconstructed from the magnetic resonance data set are repeated.

2. In a non-transitory computer-readable storage medium that stores instructions executable by one or more processors to acquire a magnetic resonance data set of an object under examination by a magnetic resonance system using a scan sequence, wherein the scan sequence comprises a sequence of sequence blocks, and each sequence block of the sequence of sequence blocks contains at least one sub-block comprising an excitation section, a detection section, or the excitation section and the detection section, wherein the excitation section comprises at least one excitation pulse, the instructions comprising:
acquiring, in a respective detection section, an echo signal or an echo train as a scan signal,
wherein at least one item of motion information is provided for each sub-block,
wherein the motion information contains information about movement of the object under examination within a duration of the respective sub-block,
wherein some of the sub-blocks are repeatedly acquired automatically based on the motion information contained in the respective sub-blocks, and
wherein at least the sub-blocks having motion information that indicates motion that allows a motion artifact in an image data set reconstructed from the magnetic resonance data set are repeated.

3. A magnetic resonance system comprising:
a controller configured to acquire a magnetic resonance data set of an object under examination by a magnetic resonance system using a scan sequence, wherein the scan sequence comprises a sequence of sequence blocks, and each sequence block of the sequence of sequence blocks contains at least one sub-block comprising an excitation section, a detection section, or the excitation section and the detection section, wherein the excitation section comprises at least one excitation pulse, the acquisition of the magnetic resonance data set comprising:
acquisition, in a respective detection section, of an echo signal or an echo train as a scan signal,

wherein at least one item of motion information is provided for each sub-block,
wherein the motion information contains information about movement of the object under examination within a duration of the respective sub-block,
wherein some of the sub-blocks are repeatedly acquired automatically based on the motion information contained in the respective sub-blocks, and
wherein at least the sub-blocks having motion information that indicates motion that allows a motion artifact in an image data set reconstructed from the magnetic resonance data set are repeated.

4. The method of claim 1 , wherein a plurality of sub-blocks are present in a sequence block of the sequence of sequence blocks.

5. The method of claim 1 , wherein all sub-blocks of a sequence block of the sequence of sequence blocks are repeated when at least one item of motion information of the sub-blocks of the sequence block indicates motion that results in a motion artifact in an image data set reconstructed from the magnetic resonance data set.

6. The method of claim 1 , wherein each repeated sub-block is assigned to an originally acquired sub-block, and the data of the repeated sub-blocks replaces the data of the originally acquired sub-blocks in each case.

7. The method of claim 1 , wherein each repeated sub-block is assigned to an originally acquired sub-block, and the data of the repeated sub-blocks is averaged with the data of the originally acquired sub-blocks having motion information that does not indicate motion that results in a motion artifact in an image data set reconstructed from the magnetic resonance data set.

8. The method of claim 1 , wherein only sub-blocks having motion information that indicates motion that results in a motion artifact in an image data set reconstructed from the magnetic resonance data set are repeated.

9. The method of claim 8 , wherein the sub-blocks are repeatedly acquired consecutively in an original order.

10. The method of claim 8 , wherein the sub-blocks to be repeated are arranged in newly created sequence blocks, in each case at a same position as an originally acquired sub-block.

11. The method of claim 1 , wherein the motion information is at least partially obtained by a camera.

12. The method of claim 1 , wherein the motion information is obtained at least partially by navigator echoes.

13. The method of claim 1 , wherein a plurality of slices are acquired, and each sub-block of a sequence block of the sequence of sequence blocks is assigned to a slice of the plurality of slices.

14. The method of claim 1 , wherein the sub-blocks to be repeated are arranged in newly created sequence blocks.

Assignees

• Siemens Healthcare Gmbh

Inventors

• Splitthoff Daniel Nicolas
• Kober Tobias
• Kroeker Randall
• Przioda Daniel
• Paul Dominik

Classifications

• G01R33/5673

  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 · CPC title

• G01R33/5616

  using gradient refocusing, e.g. EPI · CPC title

• G01R33/5611

  Parallel magnetic resonance imaging, e.g. sensitivity encoding [SENSE], simultaneous acquisition of spatial harmonics [SMASH], unaliasing by Fourier encoding of the overlaps using the temporal dimension [UNFOLD], k-t-broad-use linear acquisition speed-up technique [k-t-BLAST], k-t-SENSE (structural details of arrays of sub-coils G01R33/3415) · CPC title

• G01R33/56509 Primary

  due to motion, displacement or flow, e.g. gradient moment nulling (G01R33/567 takes precedence) · 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