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2025-10-21
The "magnetic" core of medical imaging: Superconducting magnets and rare earth magnetic materials reshape diagnostic accuracy
In the field of medical imaging, the iteration of magnet technology is driving a qualitative leap in diagnostic levels. From superconducting magnets in MRI (magnetic resonance Imaging) equipment to miniature rare earth magnets in portable ultrasound devices, magnetic materials have become an indispensable "core engine" for precision medicine. Their performance advantages directly determine the resolution and application scenarios of diagnostic equipment.
MRI equipment has extremely strict requirements for magnetic field strength. Currently, high-end models generally use superconducting magnets with a magnetic field strength of 1.5T or more, while 3.0T equipment has become the mainstream configuration in tertiary hospitals. Superconducting magnets achieve a zero-resistance state through a low-temperature environment, which can generate a stable and uniform strong magnetic field, enabling image resolution to reach the millimeter level and clearly display minute brain lesions. The R&D director of a certain medical equipment enterprise pointed out: "For every one order of magnitude improvement in the magnetic field stability of superconducting magnets, the signal-to-noise ratio of images can increase by 30%, which is crucial for the early diagnosis of tumors."
Meanwhile, rare earth permanent magnetic materials are driving the transformation of medical imaging equipment towards portability and intelligence. Neodymium iron boron magnets, with their high magnetic energy product and small size, have become the core components of portable ultrasound devices. Traditional ultrasound devices require large power supplies, while those using neodymium iron boron magnets can weigh less than 5 kilograms and have a battery life of up to 8 hours, making them suitable for primary medical institutions and emergency rescue scenarios. In implantable devices such as pacemakers, micro neodymium iron boron magnets can achieve precise energy transmission and signal control, with a service life of over 10 years.
Technological breakthroughs have also brought industrial opportunities. In the first half of 2025, the domestic market size of magnets for medical imaging equipment increased by 28% year-on-year, among which superconducting magnets accounted for 55% and rare earth permanent magnets accounted for 38%. The latest corrosion-resistant neodymium iron boron magnet developed by Baotou Rare Earth Research Institute has solved the problem of body fluid corrosion through surface coating technology and has been successfully applied to implantable medical devices, breaking the monopoly of foreign products. Industry experts predict that with the growth of demand for precision medicine, the market size of magnets in the medical field will exceed 50 billion yuan by 2030.
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