Fig. 9.
Requirements in terms of sampling frequency for laser Doppler holography in the central retinal artery. For each sampling frequency, power Doppler images are spatially averaged over the depicted ROIs on the left hand side and the result is displayed in the associated plot. The STFT parameters used for each acquisition are displayed on the left and have been chosen to have σwin ≈ 13 ms for all acquisitions. (a) fS = 10 kHz, (b) fS = 20 kHz, (c) fS = 39 kHz, (d) fS = 75 kHz. Visualization 3 (7.6MB, avi) shows PDIs as a function of the frequency for the acquisition with fS = 75 kHz.