CN2296694Y

CN2296694Y - Gradient field generator for magnetic resonance imaging equipment

Info

Publication number: CN2296694Y
Application number: CN 97217520
Authority: CN
Inventors: 罗建平
Original assignee: ANKE HIGH TECHNOLOGY Co Ltd SHENZHEN
Current assignee: Anke High-Tech Co., Ltd., Shenzhen City
Priority date: 1997-05-07
Filing date: 1997-05-07
Publication date: 1998-11-11
Anticipated expiration: 2007-05-07

Abstract

The utility model relates to a gradient field generator for magnetic resonance imaging equipment, which is composed of a magnet, a gradient plate, a gradient return wire, etc. The gradient return wire is wound on a polar plate which is arranged on the top end of the magnet along the gradient plate, and therefore, the utility model has the advantages of good linear property, small inductance, less mechanical noise, simple structure, easy fixture of the return wire, etc., and the utility model can provide favorable slice scanning images.

Description

Gradient fields generating means in the MR imaging apparatus

This utility model belongs to the medical diagnostic equipment of medical domain, especially relates to the gradient fields generating means in a kind of MR imaging apparatus.

MR imaging apparatus (hereinafter to be referred as MRI) is that a kind of patient that will be to be diagnosed pushes in the magnetic field, adds the gradient fields scanning of cutting into slices.The gradient fields generating means of present MRI is because the loop line of gradient plate is fixed with the rope binding around magnet up and down, the gradient fields generating means of this structure has caused inductance value big, and the suffered Lorentz force of loop line is big, and mechanical vibration and noise are also big, can't normal scan.

The purpose of this utility model is to overcome above-mentioned shortcoming, provides that a kind of linearity is good, inductance value and the little MRI gradient fields generating means of mechanical noise.

Technical solution of the present utility model is achieved in that a kind of gradient fields generating means, form by parts such as laterally zygomorphic magnet, gradient plate and gradient loop lines, gradient plate is fixed on the magnet by fixture, the gradient loop line along gradient plate around, produce gradient fields, it is characterized in that: the gradient loop line is looped around on the vertical pole plate of magnet along gradient plate, and by epoxy resin loop line is fixed.

This utility model is owing to adopted said structure, make the gradient fields generating means not only have characteristics such as linearity is good, inductance value is little, mechanical noise is little, but also have simple in structure, the easy fixed characteristics of loop line, for the doctor provides good section scanogram.

Accompanying drawing 1 is a structural representation of the present utility model.

Below in conjunction with accompanying drawing this utility model is described in further detail.

Among Fig. 1, framework 1 by magnet, magnet 2, pole plate 3, gradient plate 4, gradient loop line 7, the gradient fields generating means of the MR imaging apparatus that column 8 parts such as grade are formed, wherein magnet 2 is fixed on the framework 1 by fixing magnetic piece device 5, gradient plate 4 usefulness screws are fixed on the grading ring 6, gradient plate 4 is to go back the oxygen plate, also in the oxygen plate gradient coil is arranged, gradient line passes from going back oxygen plate side, couple together outside, form gradient loop line 7, gradient loop line 7 is looped around the magnet top, be on the pole plate 3, use epoxy resin (or other fixture) with coil stationary then, whole gradient fields generating means resembles cap and is buckled on the pole plate 3, the edge of medicated cap is the fixture 5 that gradient loop line 7 is no more than magnet, and gradient loop line 7 is not looped around on the magnet.Because imaging region 9 is away from the gradient loop line, so fine in the linearity at imaging region 9 places.When aliving in the gradient plate, because of loop line is looped around on the pole plate, inductance value is with regard to little (original design being looped around on the magnet, increased magnetic flux greatly, inductance value also increases greatly), the voltage that forms on the gradient coil is also just little simultaneously, just can not surpass the backward voltage requirement of the gradient current amplifier that drives gradient coil.In addition because of loop line around pole plate, and want much weak near the pole plate near the relative magnet of magnetic field intensity, so the suffered Lorentz force of loop line reduces greatly also, add that loop line shuts with epoxide resin, mechanical noise also reduces greatly.Therefore the improvement of this structure of gradient fields generating means make that its original linearity is constant, and inductance value and mechanical noise reduces greatly.

Claims

1, a kind of gradient fields generating means, form by magnet (2), pole plate (3), gradient plate (4), gradient loop line parts such as (7), gradient plate (4) is fixed on the magnet by fixture, the gradient loop line along gradient plate around, it is characterized in that: gradient loop line (7) is looped around on the vertical pole plate of magnet (2) (3) along gradient plate (4).

2, a kind of gradient fields generating means according to claim 1 is characterized in that:, gradient loop line (7) is fixed by securing member.