Magnetic field circulating device for proton/electron double resonance imaging

A circulatory device and dual resonance technology, which is applied in the measurement and magnetic resonance measurement using dual resonance, can solve the problems of high manufacturing and maintenance costs, high technical difficulties, etc., and achieve low manufacturing and maintenance costs, low technical difficulties, and high magnetic field. The effect of uniformity

Active Publication Date: 2015-07-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of high manufacturing and maintenance costs and technical difficulty in the current two magnetic field circulation technologies, and propose a magnetic field circulation device for proton-electron double resonance imaging based on permanent magnet technology

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  • Magnetic field circulating device for proton/electron double resonance imaging

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Embodiment Construction

[0015] Such as figure 1As shown, the present invention includes a permanent magnet 101, an electromagnetic magnet, a set of active shielding coils 104, 104', a set of shim coils 103, 103' and a set of sweep coils 105, 105'. The permanent magnet 101 adopts a C-shaped open structure, which is composed of upper and lower poles and a vertical yoke supporting the upper and lower poles. The three together form an imaging area open on three sides. The upper and lower poles of the magnet are made of magnetic steel made of permanent magnetic material after being magnetized, and the vertical yoke is made of magnetically conductive material A3 steel. The upper and lower poles of the C-type permanent magnet are respectively provided with a circular upper pole plate 102 and a lower pole plate 102' facing the side of the imaging area. The upper and lower pole plates are made of magnetically permeable material A3 steel. The shim coils adopt a planar structure and are composed of an upper sh...

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Abstract

The invention provides a magnetic field circulating device for proton / electron double resonance imaging, wherein a permanent magnet is used as a basic main magnetic field, and an electromagnet is used to generate a bias magnetic field; the permanent magnet (101) is of a C-shaped open structure, the electromagnet (106) is arranged in an imaging space of the permanent magnet and is of a Helmholtz structure consisting of two coils, the two coils which are the same in radius and number of turns are arranged coaxially and connected in series; an active shielding method is applied to the bias magnetic field so as to reduce eddy current influence caused by magnetic field circulation; an active shielding coil consists of an upper coil and a lower coil which are the same in radius and number of turns are arranged coaxially and connected in series. According to the magnetic field circulating device, paramagnetic resonance excitation of electrons is ensured in a field sweep manner, wherein a field sweep coil is of a Helmholtz structure and is capable of generating an even magnetic field around an imaging region and the even magnetic field varies linearly with time in one time period so as to scan a magnetic field environment required when radio frequency pulse excites electron paramagnetic resonance.

Description

technical field [0001] The invention relates to a magnetic resonance imaging device, in particular to a proton electron double resonance imaging device for free radical imaging. Background technique [0002] Free radicals refer to the atom or molecule in which the paired electrons in atoms or molecules lose one electron for some reason and leave another unpaired electron, etc. It has an important impact on the process of life activities. Electron spin resonance imaging can give the spatial distribution of free radicals in biological tissues, but cannot determine their specific distribution locations in biological tissues. Magnetic resonance imaging can obtain high-resolution structural images of biological tissues, but cannot determine the distribution of free radicals. Proton Electron Double Resonance Imaging (PEDRI) can overcome these two shortcomings, and give the true location of free radicals in various organs in the body, which is useful for studying the mechanism of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/62
Inventor 王慧贤杨文晖王铮魏树峰张晓兵
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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