A new device called Strokefinder may be be used on the move to determine if a patient has had a stroke. 

It utilizes microwaves to help make the determination. The helmet-like antenna-lined device is placed on the patient’s head and then the antennas transmit weak microwave signals into the brain and then capture information reflected back in signals. The signals that are received produce a complex pattern that is interpreted with advanced algorithms. With that information, it can diagnose a patient with either bleeding or a clot.

http://www.dotmed.com/news/story/23702