A research team from the University of Hong Kong has developed a compact, low-power MRI scanner that could transform global access to medical imaging. Traditional MRI machines require large superconducting magnets, heavy shielding, and up to 25 kilowatts of power, making them expensive and limited to major hospitals. In contrast, the new scanner uses a small 0.05-tesla permanent magnet and requires only 1,800 watts similar to a household appliance allowing it to run from a standard power outlet.
To overcome the weaker magnetic field, the device uses artificial intelligence and sensor coils that cancel radio interference. This removes the need for bulky RF shielding. Despite its low field strength, the scanner produced clear, full-body images of the brain, spine, heart, lungs, abdomen, and limbs during tests on 30 volunteers. Each scan took less than eight minutes, and the image quality was comparable to conventional MRI.
Costing around $22,000, the prototype is far cheaper than standard MRI machines, which range from $225,000 to $500,000 or more. Although not intended to replace high-field MRI, this ultra-low-field system offers a portable, quiet, and affordable option for use in community clinics, intensive care units, and regions with limited medical resources.
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