Dipolar permanent magnet for magnetic resonance

Abstract

A dipolar permanent magnet for magnetic resonance is in the shape of a polygonal prism or a cylinder, and permanent magnet materials are distributed on the side face of the prism or the cylinder to form a hollow prism or a hollow cylinder. The magnetization directions of the permanent magnet materials are the same and are along the edge direction of the prism or the axial direction of the cylinder. Magnetic conductive steel yokes are located on the upper end face and the lower end face of the prism or the cylinder respectively and cover the end faces of the hollow cylinder made of the permanent magnet materials. An area surrounded by the permanent magnet material on the side surface of the cylinder or prism and the two yokes at the end parts is a magnet air gap. The sidewall of the cylinder or prism may have one or more openings to the magnet air gap. Prismatic or cylindrical bosses are arranged on the sides, facing the magnet air gap, of the two yokes at the ends. An annular protrusion is arranged on the end face of the boss towards the magnet air gap, the outer side face of the annular protrusion coincides with the outer side face of the prismatic or cylindrical boss, and an opening is formed in the side face of the magnet. Under the condition of the same imaging space requirement, the system has light weight. The requirements of light weight and mobility of special magneticresonance imaging application can be met.

Description

technical field [0001] The invention relates to a permanent magnet. Background technique [0002] Magnetic resonance imaging equipment can be used to scan various parts of the human body, without ionizing radiation damage to the human body, and the soft tissue structure can be clearly displayed. The magnet is a core component in the magnetic resonance imaging equipment. Magnets are used to generate the main magnetic field necessary for magnetic resonance imaging. Permanent magnets are widely used in nuclear magnetic resonance systems and nuclear magnetic resonance imaging systems due to their advantages of saving energy, small stray fields, and low cost. With the improvement of the medical level, the MRI system is required to be specialized, lightweight and mobile. [0003] General traditional permanent magnets such as figure 1 and figure 2 As shown, the permanent magnet material 4a is attached to the pole plates 2 placed in parallel and symmetrically, and then connect...

AI Technical Summary

Problems solved by technology

The disadvantage is that a large amount of soft magnetic yoke iron is used to close the entire magnetic circuit, coupled with the design of the pole head of soft magnetic materials, the weight of the entire magnet remains high, which cannot meet the requirements of light weight and mobility

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