Recently, we unveiled a fascinating capability: the detection of the subtle rhythm of heartbeats across the entire face.
In this analysis, we captured a 10-second video sequence of 800 frames (80 Hz). The integration time T is 12 ms. We calculated temporal speckle contrast using a sliding window of 50 frames.
A remarkable observation emerged: the cardiac cycle is evident in all regions of the face.
This experiment demonstrates the remarkable capability of dynamic speckle imaging to follow physiological dynamics in unprecedented detail. The spatial variability in microvascular dynamics could be a biomarker for regional physiological or pathological conditions.