Fig. 5

Reconstructed velocity waveforms from the proposed method for a healthy subject. The velocity waveforms associated with the ascending aorta (AAo) and descending aorta (DAo) over 10 cardiac cycles are shown in (a) and (b). The averaged flow velocities over 30 consecutive cardiac cycles from the proposed real-time flow imaging method are compared with the ones from the cine method for both AAo (c) and DAo (d). Here, the averaging is performed as follows. We first segment the reconstructed velocity waveforms from the proposed method into sub-waveforms, each of which corresponds to a single cardiac cycle. Second, we average these sub-waveforms to obtain a synthetic flow waveform for one cardiac cycle. If a heartbeat period is different from the one in the cine method, temporal interpolation is performed