Samsung did not disclose the value of the deal but said it had bought a full stake in the Massachusetts-based firm, which makes medical devices including CT scanners.
"Samsung plans to leverage its global brand awareness and world-leading technology in consumer electronics, IT and communications with NeuroLogica in order to expand medical imaging business," the company said in a statement.
Samsung Electronics the world's top maker of smartphones, memory chips and flat-screen TVs is the flagship unit of the Samsung group.
The group in 2010 vowed to spend $20 billion over the following 10 years on five "new growth" areas including light-emitting diode technology, medical devices, biotech drugs, electric-vehicle batteries and solar panels.
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