Application of Neodymium Magnets in Magnetic Resonance Imaging

1.What is MRI?

Magnetic Resonance Imaging (MRI/NMR) is a non-invasive imaging technology that produces three dimensional detailed anatomical images. It is often used for disease detection, diagnosis, and treatment monitoring.The magnetic resonance imaging instrument was born in 1933, developed by the American physicist Isidor Isaac Rabi, and was officially put into use in the 1970s.

MRIs employ powerful magnets to create a strong magnetic field, which uses the magnetic field and computer-generated radio waves to create detailed images of organs and tissues in the body.It is often used to help doctors with disease detection, diagnosis and treatment monitoring. It is no exaggeration to say that the introduction of this medical technology has advanced the world’s medical level a lot.

2.Permanent Magnet Magnetic Resonance Imaging Machine

The main magnet is the most basic component of the MRI machine and is the device that generates the magnetic field. According to the way the magnetic field is generated, the main magnet can be divided into permanent magnet type and electromagnetic type.

The electromagnetic main magnet is a coil wound by wires. When energized, a magnetic field is generated. According to the different wire materials, electromagnetic main magnets can be divided into normally conducting magnets and superconducting magnets. The permanent magnet type main magnet is actually a large magnet (due to its large size, the main magnet is composed of a large number of block magnets.), and the magnetic field continues to exist after magnetization.

At present, most low-field-strength, open-type MRI machines use permanent magnet main magnets.

 Magnetic Resonance Imaging magnet

The neodymium magnet permanent magnet MRI instrument has the advantages of smallest floor space, smallest magnetic leakage and lowest operating cost:

① In magnetic resonance imaging, the emergence of neodymium magnets has promoted the development and miniaturization of magnetic resonance imaging, reducing the footprint of MRI instruments. Previous permanent magnet MRI instruments used ferrite permanent magnets, which weighed up to 50 tons.

② After using neodymium magnet material, each NMR instrument only requires 0.5-3 tons of permanent magnets, but the magnetic field intensity can be doubled, greatly improving the clarity of the final image.

③Permanent magnet materials can maintain magnetism for a long time after magnetization, and the magnetic field intensity is also very stable. Maintenance of permanent magnet MRI machines is therefore relatively simple and provides minimal maintenance costs.

④ When a permanent magnet is used as the main magnet, the magnetic resonance imager can be designed in a ring shape and adopt a semi-open structure. This design is very convenient and comfortable for children or those with claustrophobia.

3.In conclusion

Hopefully this article can help you learn more about the use of neodymium magnets in MRI. If you are interested in the neodymium magnets we provide for MRI equipment, you can view our related product information or contact us directly.Contact | HQ Magnet (

Introduction to MRI/NMR machine:

Application of Magnets in Magnetic Resonance Imaging(MRI) – YouTube

Magnetic Resonance Imaging (MRI) – YouTube