The resolution of MRI images is around 0.5 mm, but now a new approach brings the resolution to micrometers (one millionth of a meter)
The resolution of MRI increased to micrometer scale - short medical technology science news

Magnetic resonance imaging (MRI) is a tool used on a daily basis in medicine and research. However, the resolution of the images obtained is not very high and because of this, structures in the body smaller than half a millimeter cannot be distinguished. Now, a team of scientists introduced a new method that increases the resolution of MRI images, allowing structures as small of a few micrometers to be visualized. The technique uses nitrogen-vacancy diamond magnetometry and will allow for better diagnosis based on MRI imaging.

Read the full story: Caltech
Scientific publication: Nature Communications