Transmitting frequency calibration method for chemical saturation in MRI and MRI system

A technology of emission frequency and calibration method, applied in the field of chemical saturation imaging technology, can solve the problems of high field intensity dependence, difficulty in judging fat saturation, difference field uniformity, etc., and achieve the effect of improving image quality and stable fat suppression effect.

Active Publication Date: 2010-06-23
GE MEDICAL SYST GLOBAL TECH CO LLC
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Problems solved by technology

[0013] However, this method has the following disadvantages: (1) The field strength is highly dependent
(3) When scanning with a large FOV, the fat suppression effect in the peripheral area of ​​the field of view is poor, which is also related to the uniformity of the magnetic field and the linearity of the gradient
[0015] 1) Relatively poor field uniformity;
[0

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  • Transmitting frequency calibration method for chemical saturation in MRI and MRI system
  • Transmitting frequency calibration method for chemical saturation in MRI and MRI system
  • Transmitting frequency calibration method for chemical saturation in MRI and MRI system

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Embodiment approach

[0084] like Figure 7 As shown, it provides a preferred implementation of the chemical saturation emission frequency calibration module 700, which includes:

[0085] Determine frequency position module 710, which suppresses the fat signal of a scan slice using the inverted pulse fat suppression method to determine the frequency position of the water signal peak and the fat signal peak of the scan slice;

[0086] A module 720 for determining reference water signal amplitude, which uses a basic pre-scan method to measure the water signal peak value of the scan slice based on the frequency position of the water signal peak value determined by the determine frequency position module 710, and calculates the obtained water signal peak value The amplitude is used as the reference water signal amplitude of the scanning slice;

[0087] A module 730 for measuring the amplitude of the water signal, which adjusts the emission frequency of the chemical saturation pulse, uses the frequency...

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Abstract

The invention relates to a transmitting frequency calibration method for chemical saturation in MRI and a MRI system. The invention provides a transmitting frequency calibration method for chemical saturation, which relates to the chemical saturation imaging technology of magnetic resonance imaging (MRI) technology. The method of the invention adopts the decrease of water signal amplitude as standard to judge that the fat is fully saturated, therefore obtaining the transmitting frequency of fat saturation. And in addition, the invention also can confirm the best saturation transmitting frequency through combining with other prescan method. With the method of the invention, the fat-suppression effect is stable than before, and the method is less rely on the experience of the operator, and the image quality of chemical saturation (particularly the image quality of chemical saturation in low field MRI) is improved.

Description

technical field [0001] The present invention relates to magnetic resonance imaging (MRI) technology, in particular to chemical saturation imaging technology. Background technique [0002] MRI systems work on the principle of nuclear magnetic resonance to obtain images of the human body. Human tissue is made up of molecules like water and fat that contain hydrogen atoms. The nucleus of a hydrogen atom has an associated magnetic moment, which is a measure of the net magnetic properties of the hydrogen nucleus. When human tissue is in the magnetic field B 0 Under the action of the magnetic field B 0 Interacts with the magnetic moments of the hydrogen nuclei and aligns a fraction of the nuclei with the magnetic field B 0 In the same direction. Magnetic field B 0 Also make the magnetic moments of the same direction atomic nuclei go around the magnetic field B at a frequency (ω) (called the precession frequency, frequency of precession) 0 Direction precession. The precessi...

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Application Information

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IPC IPC(8): A61B5/055
Inventor 赖永传么佳斌
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
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