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A local shimming system and shimming method for magnetic resonance imaging

A magnetic resonance imaging, local technology, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problem of uneven B0 magnetic field, etc., and achieve the effect of short time consumption, simple shimming method, and simple system

Active Publication Date: 2020-11-10
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The local shimming system of the present invention adopts local shimming coils with a small number of channels and asymmetric distribution to solve the problem of inhomogeneity of the B0 magnetic field in the process of magnetic resonance imaging

Method used

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  • A local shimming system and shimming method for magnetic resonance imaging
  • A local shimming system and shimming method for magnetic resonance imaging
  • A local shimming system and shimming method for magnetic resonance imaging

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Embodiment Construction

[0031] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. In the specific embodiments of the present invention described below, in order to better understand the present invention, some very specific technical features are described, but, obviously, for those skilled in the art, not all These technical features are all necessary technical features to realize the present invention. Some specific embodiments of the present invention described below are just some exemplary specific embodiments of the present invention, which should not be regarded as limiting the present invention.

[0032] figure 1 A local shimming system for magnetic resonance imaging according to an embodiment of the present invention is schematically shown. In this embodiment, the local shim system includes a multi-channel local shim coil unit 10 , a DC power supply system 106 and a computer control system 104 . The local shim coil unit 10 c...

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Abstract

The invention relates to a local shimming system and shimming method for magnetic resonance imaging. Specifically, the invention provides the shimming method for magnetic resonance imaging. The methodis characterized in that the method comprises the following steps: collecting B0 field image information through a two-dimensional gradient echo; calculating and assessing B0 uniformity; optimizing current of each channel shimming coil; judging whether a minimum standard deviation value of delta f is obtained; outputting an optimal current combination value, and setting an optimum current value corresponding to each channel shimming coil on current control software; and testing and evaluating the B0 uniformity and realizing a shimming target. The invention also provides the shimming system for magnetic resonance imaging. Such design uses the shimming coil having fewer channels to realize a better shimming effect; the system is simple and relatively low in cost; the provided shimming method is simple, and short in consumed time; and meanwhile, the system is suitable for magnetic resonance temperature imaging, and improves temperature measurement precision.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a local shimming system and a shimming method for magnetic resonance imaging. Background technique [0002] In the magnetic resonance imaging system, the magnet itself can usually provide a relatively uniform static magnetic field B0 in a certain space. However, due to the difference in magnetic susceptibility of the tissue, local magnetic field changes will occur at the junction, resulting in image artifacts. Especially in single-shot spin-echo echo-planar imaging (EPI), it causes geometric distortion, signal loss and image blurring. In general, adding shim coils can reduce the non-uniformity of the magnetic field, thereby improving the image quality. [0003] Generally speaking, shim coils mainly include two types: spherical harmonic (SH) shim coils and multi-coil (MC) shim coils. The SH shim coils are generally used to correct the magnetic field non-unifor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/567
CPCG01R33/567
Inventor 李烨陈巧燕李柔罗超文剑洪邹超刘新
Owner SHENZHEN INST OF ADVANCED TECH
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