It is being used during Optical Coherence Tomography (OCT) catheterisation, which allows cardiologists to see inside the arteries of patients for more accurate placement of stents, which are used to treat blockages. When excess calcium accumulates in the blood and combines with cholesterol it forms plaque which adheres to the walls of arteries. These deposits can cause partial or complete blockage. OCT is routinely used to take images of the eyes of patients with glaucoma but is now increasingly being used to treat patients with heart disease. Dr Stuart Watkins and Dr Margaret McEntegart, consultant cardiologists at the Golden Jubilee Hospital, are now using the most advanced catheter on patients and a live recording of one of their latest cases will be used to educate cardiologists worldwide.