Coloring the body

Researchers have designed tiny, tunable magnets that may lead to color-coded MRI scans

Micromagnets that finely control radio signals during MRI may one day be used to create “color” scans more sensitive than existing MRI technology. The tiny magnets may also eventually help detect cancer by tagging malignant cells with different colors.

TUNE IN The picture on the left shows an array of micromagnets, while the picture on the right shows light diffracting off of a wafer of the particles.