Guide star lets scientists see deep into human tissue

Focusing light into a scattering medicum such as tissue has been a dream since the beginning of biomedical optics, according to Lihong Wang, PhD, WUSTL biomedical imaging expert. Previous techniques allowed light to be focused only within a millimeter of the skin. Now Wang has invented a technique called “TRUE”  that uses an ultrasound guide star to allow scattered optical light to be focused deep within tissue.