System and method for magnetic resonance imaging

Patent metadata

Field	Value
Publication number	US-2019369187-A1
Application number	US-201916508428-A
Country	US
Kind code	A1
Filing date	Jul 11, 2019
Priority date	Jul 23, 2015
Publication date	Dec 5, 2019
Grant date	—

Abstract

A system and method for magnetic resonance imaging is provided. The method includes dividing k-space into a plurality of regions along a dividing direction; scanning an object using a plurality of sampling sequences; acquiring a plurality of groups of data lines; filling the plurality of groups of data lines into the plurality of regions of the k-space; and reconstructing an image based on the filled k-space.

First claim

We claim:

1 . A method implemented on a computing device having at least one processor and at least one storage medium, the method comprising:
dividing k-space into a plurality of regions along a dividing direction, the plurality of regions comprising a first region including a center of the k-space and a second region adjacent to but different from the first region; acquiring a plurality of groups of data lines along the dividing direction by scanning an object using a plurality of sampling sequences, each group of data lines corresponding to a respective one of the plurality of sampling sequences and filled into a respective one of the plurality of regions along a filling direction, wherein the filing direction of at least a portion of the first region is opposite to the filling direction of at least a portion of the second region; and obtaining a magnetic resonance image of the object by reconstructing the plurality of groups of data lines filled into the k-space.

2 . The method of claim 1 ,
the first region including a first sub-region and a second sub-region, the first sub-region and the second sub-region being symmetric with respect to the center of the k-space, and the plurality of groups of data lines including a first group of data lines and a second group of data lines, wherein the first group of data lines and the second group of data lines are symmetrically filled into the first sub-region and the second sub-region, respectively.

3 . The method of claim 2 , the first group of data lines and the second group of data lines partially overlapping with each other.

4 . The method of claim 3 , further comprising:
performing a weighting averaging operation on an overlapping part of the first group of data lines and the second group pf data lines.

5 . The method of claim 1 , the first region and the second region partially overlapping with each other.

6 . The method of claim 5 , further comprising:
performing an amplitude correction or a phase correction on data lines filled into an overlapping area of the first region and the second region.

7 . The method of claim 1 ,
the second region including a first portion and a second portion, the first portion and the second portion being symmetric with respect to the center of the k-space, the first portion including a plurality of first segments, the second portion including a plurality of second segments, wherein each of the plurality of second segments corresponds to a respective one of the plurality of first segments with respect to the center of the k-space.

8 . The method of claim 7 ,
adjacent first segments of the plurality of first segments partially overlapping with each other; and adjacent second segments of the plurality of second segments partially overlapping with each other.

9 . The method of claim 8 , further comprising:
performing an amplitude correction or a phase correction on data lines filled into an overlapping area of the adjacent first segments or the adjacent second segments.

10 . The method of claim 7 , wherein the plurality of groups of data lines include a third group of data lines and a fourth group of data lines, the third group of data lines and the fourth group of data lines being symmetrically filled into the first segment and the corresponding second segment.

11 . The method of claim 7 , wherein
the filling directions of the plurality of first segments are the same, and the filling directions of the plurality of second segments are the same and opposite to the filling directions of the plurality of first segments.

12 . The method of claim 7 , wherein
the filling directions of adjacent first segments are opposite to each other; or the filling directions of adjacent second segments are opposite to each other.

13 . The method of claim 1 , wherein each of the plurality of data lines includes a plurality of echo signals corresponding to a plurality of echo times respectively.

14 . The method of claim 1 , further comprising:
acquiring a plurality of supplementary groups of data lines along the dividing direction by scanning the object using the plurality of sampling sequences, each supplementary group of data lines corresponding to a respective one of the plurality of sampling sequences and filled into a respective one of the plurality of regions along a direction opposite to the filling direction; and performing a weighted averaging operation on the plurality of group of data lines and the plurality of supplementary groups of data lines.

15 . A system, comprising:
a storage storing instructions; a processor in communication with the storage, wherein when executing the instructions, the processor is caused to perform operations including:
dividing k-space into a plurality of regions along a dividing direction, the plurality of regions comprising a first region including a center of the k-space and a second region adjacent to but different from the first region;
acquiring a plurality of groups of data lines along the dividing direction by scanning an object using a plurality of sampling sequences, each group of data lines corresponding to a respective one of the plurality of sampling sequences and filled into a respective one of the plurality of regions along a filling direction, wherein the filing direction of at least a portion of the first region is opposite to the filling direction of at least a portion of the second region; and
obtaining a magnetic resonance image of the object by reconstructing the plurality of groups of data lines filled into the k-space.

16 . The system of claim 15 ,
the first region including a first sub-region and a second sub-region, the first sub-region and the second sub-region being symmetric with respect to the center of the k-space, and the plurality of groups of data lines including a first group of data lines and a second group of data lines, wherein the first group of data lines and the second group of data lines are symmetrically filled into the first sub-region and the second sub-region, respectively.

17 . The system of claim 16 , the first group of data lines and the second group of data lines partially overlapping with each other.

18 . The system of claim 15 , the first region and the second region partially overlapping with each other.

19 . The system of claim 15 ,
the second region including a first portion and a second portion, the first portion and the second portion being symmetric with respect to the center of the k-space, the first portion including a plurality of first segments, the second portion including a plurality of second segments, wherein each of the plurality of second segments corresponds to a respective one of the plurality of first segments with respect to the center of the k-space.

20 . The system of claim 19 ,
adjacent first segments of the plurality of first segments partially overlapping with each other; and adjacent second segments of the plurality of second segments partially overlapping with each other.

Assignees

• Shanghai United Imaging Healthcare Co Ltd

Inventors

• Zhai Renkuan
• Li Guobin
• Wang Chaohong
• Li Zhaopeng
• Zhang Weiguo

Classifications

• G01R33/56509

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

• A61B5/7207

  of noise induced by motion artifacts · CPC title

• A61B5/742

  using visual displays (displays for heart-related electrical signals, e.g. ECG, A61B5/339) · CPC title

• G01R33/5616

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

• G01R33/4824

  using a non-Cartesian trajectory · CPC title