Method for magnetic resonance imaging and magnetic resonance device

• US 10,042,022 B2
• Filed: 03/11/2015
• Issued: 08/07/2018
• Est. Priority Date: 03/11/2014
• Status: Active Grant

• Current Assignee: Siemens Healthineers AG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Blumhagen, Jan Ole, Paul, Dominik
• Primary Examiner(s): FULLER, RODNEY EVAN
• Application Number:
  US14/645,190
• Publication Number:
  US 20150260811A1
• Time in Patent Office: 1,245 Days
• Field of Search: 324320
• CPC Class Codes: G01R 33/243 Spatial mapping of the polarizing magnetic field
• CPC Class Codes: G01R 33/3875 using correction coil assemblies, e.g. active shimming
• CPC Class Codes: G01R 33/4835 of multiple slices
• CPC Class Codes: G01R 33/543 Control of the operation of the MR system, e.g. setting of acquisition parameters prior to or during MR data acquisition, dynamic shimming, use of one or more scout images for scan plane prescription G01R33/546 takes precedence
• CPC Class Codes: G01R 33/56563 caused by a distortion of the main magnetic field B0, e.g. temporal variation of the magnitude or spatial inhomogeneity of B0 G01R33/56509, G01R33/56518, G01R33/56536 take precedence

Abstract

In order to provide an improved homogeneity of a primary magnetic field during a magnetic resonance imaging process, a method for magnetic resonance imaging of a subject under examination using a magnetic resonance device includes an acquisition of magnetic resonance image data in a plurality of scanning blocks. Different shim settings are set in each case for the plurality of scanning blocks.

Claims

1. A method for magnetic resonance imaging of a subject under examination by a magnetic resonance device, the method comprising:

acquiring magnetic resonance image data in a plurality of scanning blocks, wherein the acquiring comprises setting different shim settings in each case for the plurality of scanning blocks,

wherein the plurality of scanning blocks comprise different imaging volumes in each case,

wherein the different shim settings are matched to the different imaging volumes,

wherein the acquisition of the magnetic resonance image data comprises a plurality of breath-holding cycles, and

wherein one breath-holding cycle of the plurality of breath-holding cycles is assigned to one scanning block of the plurality of scanning blocks.

2. The method of claim 1, wherein the acquisition of the magnetic resonance image data takes place using a magnetic resonance sequence, and

wherein the plurality of scanning blocks are parts of the magnetic resonance sequence.

3. The method of claim 2, wherein the acquisition of the magnetic resonance image data takes place in the plurality of scanning blocks while maintaining a position of a patient supporting device of the magnetic resonance device.

4. The method of claim 2, wherein the plurality of scanning blocks comprise different imaging volumes in each case, and

wherein the different shim settings are matched to the different imaging volumes.

5. The method of claim 1, wherein the acquisition of the magnetic resonance image data takes place in the plurality of scanning blocks while maintaining a position of a patient supporting device of the magnetic resonance device.

6. The method of claim 1, further comprising carrying out, prior to the acquisition of the magnetic resonance image data, a frequency adjustment in a scanning block of the plurality of scanning blocks based on the shim setting that is set in relation to the scanning block of the plurality of scanning blocks.

7. The method of claim 1, wherein the frequency adjustment takes place during a pause between two breath-holding cycles of the plurality of breath-holding cycles.

8. A magnetic resonance device comprising:

a computer unit configured to drive the magnetic resonance device to acquire magnetic resonance image data in a plurality of scanning blocks;

a shim unit; and

a control unit configured to drive the shim unit such that different shim settings are set in each case by the shim unit for the plurality of scanning blocks,

wherein the plurality of scanning blocks comprise different imaging volumes in each case,

wherein the different shim settings are matched to the different imaging volumes,

wherein the acquisition of the magnetic resonance image data comprises a plurality of breath-holding cycles, and

wherein one breath-holding cycle of the plurality of breath-holding cycles is assigned to one scanning block of the plurality of scanning blocks.

9. The magnetic resonance device of claim 8, wherein the acquisition of the magnetic resonance image data takes place using a magnetic resonance sequence, and

wherein the plurality of scanning blocks are parts of the magnetic resonance sequence.

10. The magnetic resonance device of claim 8, wherein the acquisition of the magnetic resonance image data takes place in the plurality of scanning blocks while maintaining a position of a patient supporting device of the magnetic resonance device.