MIT develops tiny sensor for monitoring tumors

The Boston Business Journal reports on the sensor, intended to be implanted during a biopsy. A key issue: How to get power to the thing. Magnets to the rescue.

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While the team could make the sensor and its circuit board small enough to fit in the tip of a biopsy needle, researchers struggled to figure out a power source. Instead, scientists had the reading device create a voltage in the implant by issuing a magnetic field. The reader then interprets return signals, and look at changes over time to view changes in oxygen and acidity.

Basically

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This is the same basic two-way technology behind most RFID readers these days. Magnetically derived voltage operates a chip and that sends back a readable signal.

Also, ICP.