Method and apparatus for processing MRI images

Patent metadata

Field	Value
Publication number	US-10408900-B2
Application number	US-201715605253-A
Country	US
Kind code	B2
Filing date	May 25, 2017
Priority date	May 27, 2016
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

The present disclosure in some embodiments provides a method and an apparatus for processing MRI images wherein a plurality of slices of an object is applied with a spatial encoding gradient and a corrected gradient for applying a radial sampling, and radially sampled magnetic resonance signals of the slices are received, and MRI images are generated with the radial sampling applied over multi-bands.

First claim

What is claimed is:

1. A magnetic resonance imaging apparatus, comprising:
a gradient control unit configured to apply a spatial encoding gradient to at least two slices of a plurality of slices and to apply a corrected gradient for an application of a radial sampling to the at least two slices, which is based on a change in magnitude of a read-out gradient;
an RF (radio frequency) reception unit configured to receive a magnetic resonance signal of each of the at least two slices radially sampled by applying the corrected gradient; and
an image processing unit configured to generate an MRI (magnetic resonance imaging) image of each of the at least two slices based on received magnetic resonance signals,
wherein the image processing unit is configured to interpolate a non-measured magnetic resonance signal in a parallel imaging, and to generate the MRI image of each of the at least two slices by using a simultaneous multi-slice imaging technique.

2. The magnetic resonance imaging apparatus of claim 1 , wherein the
gradient control unit applies the corrected gradient in every TR (repetition time) period, and the RF reception unit receives magnetic resonance signals of the at least two slices in a superposed state in each TR period.

3. The magnetic resonance imaging apparatus of claim 2 , wherein the magnetic resonance signal of each of the at least two slices contains a position information shifted in a radial direction as the corrected gradient is applied.

4. The magnetic resonance imaging apparatus of claim 2 , wherein the
corrected gradient is obtained by correcting an additional gradient for shifting the magnetic resonance signal of each of the at least two slices along a frequency axis in a Cartesian coordinate sampling, by using a cosine or sine function.

5. The magnetic resonance imaging apparatus of claim 4 , wherein the
corrected gradient is a gradient obtained by adding an offset value of the radial sampling to the cosine or sine function.

6. The magnetic resonance imaging apparatus of claim 1 , wherein the
spatial encoding gradient comprises:
a slice gradient related to a gradient in a slice direction, a frequency gradient related to a gradient in a frequency direction, and a phase gradient related to a gradient in a phase direction.

7. A magnetic resonance imaging method, comprising:
performing a gradient control comprising:
applying a spatial encoding gradient to at least two slices of a plurality of slices, and
applying a corrected gradient for an application of a radial sampling to the at least two slices, which is based on a change in magnitude of a read-out gradient;

performing an RF (radio frequency) reception comprising:
receiving a magnetic resonance signal of each of the at least two slices radially sampled by applying the corrected gradient; and

performing an image processing comprising:
generating an MRI (magnetic resonance imaging) image of each of the at least two slices based on received magnetic resonance signals,
wherein the generating the MRI image comprises interpolating a non-measured magnetic resonance signal in a parallel imaging, and generating the MRI image of each of the at least two slices by using a simultaneous multi-slice imaging technique.

8. The magnetic resonance imaging method of claim 7 , wherein the
performing of the gradient control comprises:
applying the corrected gradient in every TR (repetition time) period, and
wherein the performing of the RF reception comprises:
receiving magnetic resonance signals of the at least two slices in a superposed state in each TR period.

9. The magnetic resonance imaging method of claim 8 , wherein the magnetic resonance signal of each of the at least two slices contains a position information shifted in a radial direction as the corrected gradient is applied.

10. The magnetic resonance imaging method of claim 7 , wherein the
corrected gradient is obtained by correcting an additional gradient for shifting the magnetic resonance signal of each of the at least two slices along a frequency axis in a Cartesian coordinate sampling, by using a cosine or sine function.

11. The magnetic resonance imaging method of claim 10 , wherein the
corrected gradient is a gradient obtained by adding an offset value of the radial sampling to the cosine or sine function.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Park Hyun Wook
• Kim Dong Chan

Classifications

• G01R33/482

  using a Cartesian trajectory · CPC title

• G01R33/4835

  of multiple slices · 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

• G01R33/4824 Primary

  using a non-Cartesian trajectory · CPC title

• G01R33/3852 Primary

  Gradient amplifiers; means for controlling the application of a gradient magnetic field to the sample, e.g. a gradient signal synthesizer · CPC title