Method for acquiring variable slab magnetic resonance imaging data

Patent metadata

Field	Value
Publication number	US-11209512-B2
Application number	US-201716496097-A
Country	US
Kind code	B2
Filing date	Oct 16, 2017
Priority date	Mar 21, 2017
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

The present invention relates to a method for acquiring data for acquiring an arteriogram and a venogram of magnetic resonance imaging, the method: using one or more echo; and simultaneously acquiring, through one-time photography, an arteriogram and a venogram, which are optimized according to the number of slabs or improving connectivity of a slab boundary part of the arteriogram.

First claim

The invention claimed is:

1. A data acquisition method using one or more echoes, the method comprising:
performing, by an MRI device, a first process that includes acquiring a low frequency component of a first echo generated by exciting a first RF signal with respect to a first slab;
performing, by the MRI device, a second process that includes acquiring a low frequency component of a third echo generated by exciting a second RF signal with respect to a second slab;
performing, by the MRI device, a third process that includes acquiring a high frequency component of a fifth echo generated by exciting a third RF signal with respect to an entire slab including the first slab and the second slab; and
generating, by a computing device, an entire MRI image by combining the low frequency component of the first echo, the low frequency component of the third echo, and the high frequency component of the fifth echo.

2. The method of claim 1 , wherein the first process further comprises acquiring a high frequency component with respect to a second echo generated by exciting the first RF signal with respect to the first slab,
the second process further comprises acquiring a high frequency component with respect to a fourth echo generated by exciting the second RF signal with respect to the second slab, and
the third process further comprises acquiring a low frequency component in a sixth echo generated by exciting the third RF signal with respect to the entire slab including the first slab and the second slab.

3. The method of claim 2 , wherein the first echo is an echo generated earlier than the second echo, the third echo is an echo generated earlier than the fourth echo, and the fifth echo is an echo generated earlier than the sixth echo.

4. The method of claim 2 , wherein the first echo is a first echo generated by exciting the first RF signal, the second echo is a second echo generated by exciting the first RF signal, the third echo is the first echo generated by exciting the second RF signal, the fourth echo is a second echo generated by exciting the second RF signal, the fifth echo is a first echo generated by exciting the third RF signal, and the sixth echo is a second echo generated by exciting the third RF signal.

5. The method of claim 1 , wherein
the first process is configured to excite the first RF signal a plurality of times, and
each time the first RF signal is excited, the first echo is configured to acquire low frequency lines among K-space lines in a predetermined order, and
the second process is configured to excite the second RF signal a plurality of times, and
each time the second RF signal is excited, the third echo is configured to acquire low frequency lines among K-space lines in a predetermined order, and
the third process is configured to excite the third RF signal a plurality of times, and
each time the third RF signal is excited, the fifth echo is configured to acquire high frequency lines among K-space lines in a predetermined order.

6. The method of claim 2 , wherein
the first process is configured to excite the first RF signal a plurality of times, and
each time the first RF signal is excited, the first echo acquires low frequency lines among K-space lines in a predetermined order, and
in the second echo, high-frequency lines among K-space lines are acquired in a predetermined order,
the second process is configured to excite the second RF signal a plurality of times, and
each time the second RF signal is excited, the third echo acquires low frequency lines among K-space lines in a predetermined order, and
in the fourth echo, high-frequency lines among the K-space lines are acquired in a predetermined order, and
the third process is configured to excite the third RF signal a plurality of times, and
each time the third RF signal is excited, the fifth echo acquires high frequency lines among K-space lines in a predetermined order, and
in the sixth echo, low-frequency lines among K-space lines are acquired in a predetermined order.

7. The method of claim 1 , wherein the generating comprises, generating, the computing device, a first low frequency sub-image by transforming first low frequency phase encoding lines acquired in the first echo of the first process into an image region;
generating, by the computing device, a second low frequency sub-image by transforming second low frequency phase encoding lines acquired in the third echo of the second process into an image region;
generating, by the computing device, a third low frequency sub-image by combining the first low frequency sub-image and the second low frequency sub-image;
transforming, by the computing device, the third low frequency sub-image into a frequency domain to acquire a first low frequency data set; and
acquiring, by the computing device, first K-space data by combining the first low frequency data set and the third high frequency phase encoding lines acquired in the fifth echo of the third process in a frequency domain.

8. The method of claim 2 , wherein the generating comprises, generating, by the computing device, a first high frequency sub-image by transforming first high frequency phase encoding lines acquired in the second echo of the first process into an image region;
generating, by the computing device, a second high frequency sub-image by transforming second high frequency phase encoding lines acquired in the fourth echo of the second process into an image region;
generating, by the computing device, a third high frequency sub-image by combining the first high frequency sub-image and the second high frequency sub-image;
transforming, by the computing device, the third high frequency sub-image into a frequency domain to acquire a second high frequency data set; and
acquiring, by the computing device, second K-space data by combining the second high frequency data set and the third low frequency phase encoding lines acquired in the sixth echo of the third process with each other in a frequency domain.

9. The method of claim 1 , wherein the generating comprises, transforming, by the computing device, first low frequency phase encoding lines acquired in the first echo of the first process into a first image region data, second low frequency phase encoding lines acquired in the third echo of the second process into a second image region data, and third high frequency phase encoding lines acquired in the fifth echo of the third process into a third image region data; and combining the first image region data, the second image region data, and the third image region data with each other in an image region.

10. The method of claim 2 , transforming, by the computing device, first high frequency phase encoding lines acquired in the second echo of the first process into a first image region data, second high frequency phase encoding lines acquired in the fourth echo of the second process into a second image region data, and third low frequency phase encoding lines acquired in the sixth echo of the third process into a first image region data; and
combining the first image region data, the second image region data, and the third image region data with each other in an image region.

11. The method of claim 2 , wherein shooting conditions in the first echo and shooting conditions in the second echo are different from each other.

12. The method of claim 2 , wherein Time of Flight MR angiogram is acquired at a time of the first echo, and Susceptibility weighted imaging is acquired at a time of the second echo.

13. The method of claim 2 , further comprising acquiring an arterial image using data acquired from the first echo, the third echo, an

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Park Sung-Hong
• Do Won-Joon

Classifications

• A61B5/055 Primary

  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging · CPC title

• G01R33/565

  Correction of image distortions, e.g. due to magnetic field inhomogeneities · CPC title

• G01R33/4818

  MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space · CPC title

• G01R33/4822

  in three dimensions · CPC title

• G01R33/446

  Multifrequency selective RF pulses, e.g. multinuclear acquisition mode (spatially selective RF pulses G01R33/4833) · CPC title