Micro-Optical Coherence Tomography (μOCT) is the highest resolution OCT technology available today. μOCT is being used in several areas in which its high resolution and speed make it the only technology able to image many biological phenomena. One such example is the respiratory airways, which are normally lined with cilia, microscopic hairs that continuously work to sweep away mucus. This process is a crucial element of respiratory defense that becomes impaired in a variety of diseases, including cystic fibrosis. Another example is in vascular disease. Intravascular ultrasound and conventional OCT can detect plaques in arteries, but μOCT can see the interaction between individual cells, helping to discover the factors that contribute to vulnerable plaque formation and rupture.