Video 1.

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4-D Doppler OCT image of blood flow. Doppler data are superimposed on a 3-D structure of the heart. Blue indicates blood flow toward the illumination beam, while red indicates flow away from the beam. The video also includes the pulsed Doppler traces from Fig. 2 with a scrolling line matching the phase of the pulsed Doppler waveform with the corresponding cardiac volume. The video allows one to visualize the interplay between movement of the heart walls and blood flow.