Transmitter chip helps doctors track swallowable electronics through the body

To solve that problem, the team developed a device called addressable transmitters operated as magnetic spins (ATOMS). The prototype measures 1.4 sq mm, about 250 times smaller than a penny, and packed into that tiny space is a magnetic field sensor, integrated antennas, a wireless power source and a location circuit that responds to the changing magnetic field around it to beam out the chip’s location in the body.

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