David Cosgrove obituary

My friend and colleague David Cosgrove, who has died aged 78, was a pioneer of clinical ultrasound, a non-invasive medical imaging technique that uses sound waves to examine joints, vessels and internal organs of the body as well as to monitor babies in the womb.

He was known for his work on developing microbubble-contrast ultrasound, where trackable bubbles much smaller than a red blood cell are injected into the bloodstream so that blood flow and other information can be monitored.