Magnetic resonance measurement with prospective movement correction

Patent metadata

Field	Value
Publication number	US-11280869-B2
Application number	US-202016853967-A
Country	US
Kind code	B2
Filing date	Apr 21, 2020
Priority date	Apr 25, 2019
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A method is used to carry out a magnetic resonance measurement with at least one echo train with n spin echoes and prospective movement correction. Movement correction data for each echo train is updated at the start of the echo train and is then updated again at most partially for the spin echoes.

First claim

The invention claimed is:

1. A method for carrying out a magnetic resonance measurement with at least one echo train with N spin echoes, the method comprising:
updating movement correction data for each echo train at the start of the echo train; and
updating the movement correction data again for only a subset of the N spin echoes.

2. The method of claim 1 , wherein the movement correction data for each echo train is updated just once at the start of the echo train.

3. The method of in claim 1 , wherein the movement correction data is updated for each M'th spin echo of the echo train, wherein N >M.

4. The method of claim 3 , wherein M is an even number.

5. The method of claim 1 , wherein updating the movement correction data is carried out after a read-out segment and before a spoiler segment of a spin echo period.

6. The method of claim 1 , wherein updating the movement correction data uses a smoothing filter and is applied to at least two spin echoes with a different k-value with a different smoothing strength.

7. The method of claim 6 , in which the smoothing strength for spin echoes with k-values close to a center of k-space is stronger than for spin echoes with further outwardly lying k-values.

8. The method of claim 1 , wherein updating the movement correction data uses a smoothing filter and a smoothing strength at the start of the echo train is stronger than at its end.

9. An MR tomography system comprising:
an MR tomography scanner configured to obtain magnetic resonance measurement data with at least one echo train with N spin echoes; and
a processor configured to:
update movement correction data for each echo train at the start of the echo train; and
update the movement correction data again for only a subset of the N spin echoes.

10. The MR tomography system of claim 9 , wherein the movement correction data for each echo train is updated just once at the start of the echo train.

11. The MR tomography system of claim 9 , wherein the movement correction data is updated for each M'th spin echo of the echo train, wherein N >M.

12. The MR tomography system of claim 9 , wherein M is an even number.

13. The MR tomography system of claim 9 , wherein updating the movement correction data is carried out after a read-out segment and before a spoiler segment of a spin echo period.

14. The MR tomography system of claim 9 , wherein updating the movement correction data uses a smoothing filter and is applied to at least two spin echoes with a different k-value with a different smoothing strength.

15. The MR tomography system of claim 14 , in which the smoothing strength for spin echoes with k-values close to a center of k-space is stronger than for spin echoes with further outwardly lying k-values.

16. The MR tomography system of claim 9 , wherein updating the movement correction data uses a smoothing filter and a smoothing strength at the start of the echo train is stronger than at its end.

Assignees

• Siemens Healthcare Gmbh
• Univ Freiburg Albert Ludwigs

Inventors

• Gao Xiang
• Kober Tobias
• Splitthoff Daniel Nicolas
• Zaitsev Maxim

Classifications

• G01R33/5617 Primary

  using RF refocusing, e.g. RARE · CPC title

• G01R33/5608

  Data processing and visualization specially adapted for MR, e.g. for feature analysis and pattern recognition on the basis of measured MR data, segmentation of measured MR data, edge contour detection on the basis of measured MR data, for enhancing measured MR data in terms of signal-to-noise ratio by means of noise filtering or apodization, for enhancing measured MR data in terms of resolution by means for deblurring, windowing, zero filling, or generation of gray-scaled images, colour-coded images or images displaying vectors instead of pixels (image data processing or generation, in general G06T) · CPC title

• G01R33/4822

  in three dimensions · CPC title

• G01R33/5615 Primary

  Echo train techniques involving acquiring plural, differently encoded, echo signals after one RF excitation, e.g. using gradient refocusing in echo planar imaging [EPI], RF refocusing in rapid acquisition with relaxation enhancement [RARE] or using both RF and gradient refocusing in gradient and spin echo imaging [GRASE] · CPC title

• G01R33/4826

  in three dimensions · CPC title