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The setup—an MRI machine to see the tumors and an ultrasound probe to heat them—cost millions of dollars, but it wasn’t particularly fast. It was more like a “laser printer that takes eight days to print and looks like my kids drew it in crayon,” he says. “I set out to make a super-low-cost version of this $6 million machine, to make it 1,000 times cheaper, 1,000 times faster, and a hundred times more precise.
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