Figure 6.

In vivo cross-sectional tracking of tissue movement. (a) Sequence of OCT B-scans (false colour mode) performed after illuminating the coral Favites abdita. The three scans show the coral polyp in an expanded state in darkness (0 s) and after 7.5 s and 15 s of high light illumination. The three images are superimposed for visualizing tissue plasticity (see electronic supplementary material, movie S3 for real-time video of tissue contraction). (b) Estimated maximal linear velocity of tissue movement calculated as the running average of the vertical displacement of a white marker (see Material and methods section) towards the centre of the image over three frames (about 2.2 s).