Raymond F. Chen, 79, a physician and National Institutes of Health scientist whose work helped advance the development of fluorescein angiograms of kidneys, retinas and other organs, died Nov. 14 of cardiac arrest at Shady Grove Adventist Hospital in Rockville.

He was stricken while dining at a nearby restaurant, said his wife, Elaine Chen.

Dr. Chen, a Montgomery Village resident, worked at NIH from 1963 to 1993. He specialized in the fluorescence of enzymes and had written extensively about it in medical and scientific publications.

Raymond Fung Chu Chen was born in Canton, China, and grew up in New York City. He was a 1955 graduate of Harvard University and a 1959 graduate of Cornell University’s medical school in New York City. He received a doctorate in biochemistry at the University of Utah in 1960.

In senior Olympic competitions, he won gold medals in tennis, swimming and ping-pong.

Survivors include his wife of 50 years, Elaine Boltson Chen of Montgomery Village; two children, Roger Alexander Griffin and Linda Carty, both of Montgomery Village; and one grandson.

— Bart Barnes