Needle-size device created to track tumors, radiation dose

Purdue engineer Babak Ziaie shows the prototype wireless device he has developed with doctoral student Chulwoo Son at the university's Birck Nanotechnology Center. The device fits inside a hypodermic needle to be injected into tumors to tell doctors the precise dose of radiation being received through therapy. The technology will eventually be shrunk to the size of a rice grain and also will be able to locate a tumor's exact position in real-time. (Purdue News Service photo/David Umberger)