Figure 4
Example of event. (a–e) The image sequence shows several raw frames of a video (Supplementary Movie S2) centered on one capillary acquired with our prototype on one of the patients at baseline. The dark loop corresponds to the capillary vessel filled with RBCs that absorbs light at the illumination wavelength. An optical absorption gap in the microcirculation, approximately the same size as the capillary width (~15 µm) can be observed flowing through the arterial limb of the capillary (black triangular arrowheads). Frame numbers are labeled at the top right corner. The frame rate was 60 FPS and the exposure time 16.7 ms. The contrast was adjusted for the ROI shown.
