However, if the skin is perfused (ie blood is still flowing through it), then it's going to heal spontaneously without scarring. A rival laser Doppler machine by Moor Instruments Greg Williams, who heads the burns unit at Chelsea and Westminster Hospital told the BBC his hospital was one of several in the UK already using a rival laser Doppler imager built by Moor Instruments and which was recently approved by the National Institute for Health and Clinical Excellence (NICE). He said that while that machine was bulky and provided only static images, he was yet to be convinced of the need for a real-time alternative.