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Quick and active shimming method for MRI (Magnetic Resonance Imaging) system

An active and fast technology, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problems of poor frequency fat pressing effect, insufficient fast and stable shimming process, poor shimming effect, etc., to achieve fast calculation speed, High precision, accurate and stable shimming effect

Active Publication Date: 2015-04-08
宁波鑫高益软件有限公司
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Problems solved by technology

[0005] However, the existing active shimming technology for MRI systems generally has poor shimming effect, poor frequency fat suppression effect, and the shimming process is not fast and stable enough, which needs further improvement

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  • Quick and active shimming method for MRI (Magnetic Resonance Imaging) system
  • Quick and active shimming method for MRI (Magnetic Resonance Imaging) system
  • Quick and active shimming method for MRI (Magnetic Resonance Imaging) system

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] The fast active shimming method of the MRI system provided by the present invention comprises the following five steps, see figure 1 As shown, the details are as follows:

[0035] Step 1. Set the scanning parameters of the MRI system. The specific setting process is as follows:

[0036] Step (1-1), under normal temperature conditions, put the pre-fabricated water model into the MRI scanner for scanning, the longitudinal relaxation time T1 value of the aforementioned water model is 570ms~580ms;

[0037] Step (1-2), scan with double-echo sequence, that is, use ordinary GRE sequence to scan with two different echo times, which constitutes a double-echo sequence scan. Scanning with a double-echo sequence can collect Obtain double echo data; set scan parameters: repeat time TR select 15ms ~ 25ms; the value of two echo time TE meet the same...

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Abstract

The invention relates to a quick and active shimming method for a MRI (Magnetic Resonance Imaging) system. The method is characterized by comprising the following steps: 1, scanning parameters of the MRI system are set; 2, data are collected; 3, a magnetic field nonuniformity distribution field of the MRI system is calculated; 4, a complex iterative approximation method is adopted to obtain magnetization vector phase information; and 5, shimming current is calculated. Compared with the prior art, the quick and active shimming method for the MRI (Magnetic Resonance Imaging) system has the advantages that a double-echo sequence is used for collecting echo data; a complex fitting synthesis method is adopted to indirectly obtain the magnetic field nonuniformity distribution field of the MRI system; trouble on phase fitting caused by phase winding can be avoided; and thus, the method provided by the invention can realize accurate and stable shimming for the MRI system, phase unwinding is not needed, the calculation speed is fast, and accuracy is high.

Description

technical field [0001] The invention relates to a fast active field shimming method for an MRI system. Background technique [0002] Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) is a high-tech in the field of medical imaging. It uses specific radio frequency pulses and spatially encoded magnetic fields to make hydrogen nuclear resonance in living organisms generate signals, which are processed by computers to form images. Since it came out in the 1970s, MRI technology has developed rapidly. Due to its high contrast, multiple imaging parameters, tomographic imaging at any level, no bone artifact interference, and no ionizing radiation, it has become the most advanced imaging examination. One of the tools widely used in clinical examination of various parts of the human body. [0003] When using an MRI system to scan the human body, the person needs to enter a specific magnetic field provided by the MRI system. However, due to the influence and limitation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/3875
Inventor 张乔夫王雷朱剑锋李璟
Owner 宁波鑫高益软件有限公司
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