A new technology can capture clear images of tiny blood vessels using light and ultrasound. This will enable better treatments, such as reconstructive surgery for patients who have had a part of their head, neck or breast removed due to cancer. Doctors can safely cut and transplant skin flaps containing blood vessels from a different area of the body, decreasing the burden on patients. The technology can also visualize transparent, thin lymph vessels, and improve the treatment of lymphedema.