Adaptive active automatic shimming method and system for magnetic resonance system
An automatic shimming and magnetic resonance technology, applied in magnetic resonance measurement and other directions, can solve the problems of more than half an hour or even several hours, poor adaptability, and failure to meet requirements.
Active Publication Date: 2017-07-07
SHENZHEN INST OF ADVANCED TECH
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Problems solved by technology
For sequences and methods that require high magnetic field inhomogeneity, automatic shimming may take more than half an hour or even several hours, and the required effect cannot be achieved
Although some studies have proposed automatic shimming methods such as gradient coding, which reduces the influence of assumptions on measurement, the improvement in accuracy is not obvious, and it is impossible to effectively reduce the shimming time and improve the shimming effect
[0006] In short, the various automatic shimming methods in the prior art still have the problems of long adjustment period and poor adaptability, which need to be further improved
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[0051] The present invention is based on an automatic shimming method in a magnetic resonance imaging system, and the shimming refers to an operation process of adjusting the uniformity of the magnetic field distribution in a certain section of the magnetic field. The active shimming system set up in the magnetic resonance imaging system usually includes:
[0052] Active shim coils installed on the surface of the upper and lower magnetic poles of the magnetic resonance imaging permanent magnet, for example, active shim coils can be installed in pairs;
[0053] A shim coil controller connected to the active shim coils, which provides a DC constant current source for the active shim coils;
[0054] The main controller connected with the shim coil controller above performs radio frequency excitation on the object under imaging in the static magnetic field through the radio frequency coil in the magnetic resonance imaging system, and calculates the required The value of the curre...
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The present invention provides an adaptive active automatic shimming method and system for a magnetic resonance system, which includes: collecting the FID signal of the magnetic resonance system; extracting the frequency domain waveform of the FID signal; judging whether the frequency domain waveform has symmetry If yes, select the odd-order current component in the inhomogeneous components that constitute the static magnetic field as the current component to be processed; if not, select the even-order current component in the inhomogeneous components that constitute the static magnetic field as the current component to be processed . The invention can realize an efficient, accurate and adaptable automatic shimming scheme.
Description
technical field [0001] The invention relates to a shimming method for a magnetic resonance imaging system, in particular to an adaptive active automatic shimming method and system for a magnetic resonance system. Background technique [0002] Magnetic Resonance Imaging (MRI) is widely used in scientific research, clinical medicine and many other fields due to its incomparable advantages such as high spatial resolution and good spatial positioning. A highly uniform external magnetic field is the basic guarantee for high-quality imaging of magnetic resonance imaging technology. At present, superconducting magnets cannot meet the uniformity requirements for specific detection samples due to reasons such as coil length, diversity of magnetic susceptibility of detection objects, and environmental changes. Many magnetic resonance imaging methods are very sensitive to the uniformity of the magnetic field, and inhomogeneous magnetic fields will cause serious artifacts in the image,...
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IPC IPC(8): G01R33/38
Inventor 杨沙沙吴垠刘新郑海荣
Owner SHENZHEN INST OF ADVANCED TECH