Nanorobots will be used for medical purposes and brain scan

Ray Kurzweil : futurist
Computers less than 100 nm in size will be possible. As one of their first practical applications, nanomachines will be used for medical purposes. Highly advanced medical nanobots will perform detailed brainscans on live patients.

Kurzweil, Ray. 2005. The singularity is near: when humans transcend biology. New York: Viking.