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Magnetic field stabilizing method and device for magnetic resonance imaging system

A magnetic resonance imaging and stabilization method technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as magnetic field drift

Inactive Publication Date: 2014-12-24
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of magnetic field drift in the existing magnetic resonance imaging system, reduce and eliminate the fluctuation of the main magnetic field, and improve the imaging level of the magnetic resonance imaging system

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  • Magnetic field stabilizing method and device for magnetic resonance imaging system
  • Magnetic field stabilizing method and device for magnetic resonance imaging system
  • Magnetic field stabilizing method and device for magnetic resonance imaging system

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0035] figure 2 Shown is the basic structure of the device of the present invention. Such as figure 2 As shown, the magnet 101 is the main magnetic field magnet of the magnetic resonance imaging system. A set of active compensation coils 201 are provided in the magnet 101, and the magnetic field generated by the active compensation coil 201 is used to compensate the magnetic field drift of the main magnet, so that the total magnetic field strength remains stable. The active compensation coil 201 is connected to a constant current source 205, and the current of the active compensation coil 201 is provided by the constant current source 205. The constant current source controller 204 is connected to the current constant current source 205, and the constant current source controller 204 controls the magnitude and direction of the current of the constant curren...

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Abstract

The invention discloses a magnetic field stabilizing method and device for a magnetic resonance imaging system. According to the magnetic field stabilizing method, a group of active compensating coils is arranged in a magnet, real-time magnetic field frequency drift amount is acquired, the current magnitudes and change rates of the active compensating coils are set, and the magnetic field change of a main magnet is compensated in real time by using a generated magnetic field, so that a total magnetic field is kept stable, and drift of the magnetic field is eliminated. The magnetic field stabilizing device comprises a group of active compensating coils (201) for generating a compensating magnetic field, a constant-current source (205) for driving the active compensating coils, and a constant-current-source controller (204) for controlling the current magnitude and direction of a constant current source. By adopting the method, the main magnetic field of the magnetic resonance imaging system can keep stable in a scanning process, and the quality of images is improved greatly.

Description

Technical field [0001] The invention relates to a magnetic resonance imaging (MRI) system, in particular to a magnetic field stabilization method and a magnetic field stabilization device of the magnetic resonance imaging system. Background technique [0002] When the magnetic resonance imaging system is working, the human body is placed in a strong static magnetic field, and the nuclei in some areas of the human body are excited by emitting radio frequency pulses to the human body. After the radio frequency field is removed, these excited nuclei radiate radio frequency signals, which are received by the antenna. When the gradient magnetic field is added in this process, the spatial distribution information of the human body can be obtained through the radio frequency signal, thereby reconstructing a two-dimensional or three-dimensional image of the human body. [0003] When the MRI system is working, it usually looks like figure 1 As shown, the human body is put into the magnet 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055
Inventor 杨文晖
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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