Diagnosing vasculitis, painful inflammation of the blood vessels, is traditionally done with an invasive skin biopsy that could lead to complications especially in patients prone to poor wound healing. Two professors at Duke University have developed a non-invasive biopsy device, using light, that measures the speed, color, and amount of blood flow through the small blood vessels on a centimeter of skin. The device using photoacoustic imaging, which is the conversion of light into ultrasound waves that are then analyzed to create high-resolution images. The current prototype is about the size of a flashlight and provides, painless and accurate results. Read more about using non-invasive light to biopsy vasculitis at Duke University.