Magnetic resonance imaging system radio-frequency calibration method and magnetic resonance imaging system radio-frequency calibration device

A magnetic resonance imaging and radio frequency calibration technology, which is applied in the direction of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, and measurement equipment, can solve the problems of unstable imaging quality and large differences, so as to improve calibration efficiency and shorten iterations Effect of Range and Calibration Time

Active Publication Date: 2017-06-20
SHANGHAI NEUSOFT MEDICAL TECH LTD
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Problems solved by technology

In the clinical application of magnetic resonance, the conventional method of manually correcting the radio frequency energy and fixing the radio frequency energy excitation amount, there is a defect that the fixed radio frequency energy cannot be adapted to each individual when there is a large difference between different individuals, which will lead to unstable imaging quality , which vary greatly among individuals

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  • Magnetic resonance imaging system radio-frequency calibration method and magnetic resonance imaging system radio-frequency calibration device
  • Magnetic resonance imaging system radio-frequency calibration method and magnetic resonance imaging system radio-frequency calibration device
  • Magnetic resonance imaging system radio-frequency calibration method and magnetic resonance imaging system radio-frequency calibration device

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[0044] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

[0045] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of the present application, first information may also b...

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Abstract

The application provides a magnetic resonance imaging system radio-frequency calibration method and a magnetic resonance imaging system radio-frequency calibration device. The method comprises the following steps: carrying out iterative scanning in a first search scope with preset basic amplitude as an initial amplitude value of a radio-frequency pulse applied, and collecting a first echo amplitude signal of a specified spin echo in a first correction scope; judging whether there is a minimal value in the first echo amplitude signal; and when there is a minimal value in the first echo amplitude signal, acquiring a radio-frequency amplitude value corresponding to the minimal value, and taking the radio-frequency amplitude value as a first pulse calibration value for correcting a 90-degree flip angle. According to the application, the currently known basic radio-frequency amplitude obtained from a water model is taken as an initial value, there is no need for iterative search within the full scope of 0-180 degrees, the scope of iteration and calibration time are reduced, and the efficiency of calibration is improved.

Description

technical field [0001] The present application relates to the field of magnetic resonance imaging systems, in particular to a radio frequency calibration method and device for a magnetic resonance imaging system. Background technique [0002] In a magnetic resonance imaging system, in order to obtain an accurate flip angle, the radio frequency transmission power is usually calibrated for the radio frequency system, and the calibration will be performed during the calibration of the entire system. The specific calibration method is to select a specific radio frequency pulse waveform, apply a radio frequency pulse with a certain frequency and a certain amplitude, and the amplitude of the radio frequency pulse is continuously increased, and receive the spin echo signal generated during the corresponding signal receiving period. Until the interval of the entire pulse amplitude is traversed, and the amplitude of the spin echo signal is recorded during this period. Different meth...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/48G01R33/58
CPCG01R33/48G01R33/586
Inventor 徐勤
Owner SHANGHAI NEUSOFT MEDICAL TECH LTD
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