Vector flow velocity measurement based on bidirectional scanning in optical coherence tomography

We propose to measure the vector velocity of the flow field based on bidirectional scanning in optical coherence tomography (OCT). Transverse velocity was determined by dynamic light scattering OCT (DLS-OCT) under four introduced transverse synthetic speeds, while axial velocity was obtained by Doppler OCT (DOCT). The flow fields within two straight channels and an improperly welded Y-junction were measured. In vivo measurement on a rabbit was further conducted. Without resorting to system modification and requiring only four scan biases, the proposed method is advantageous in measurement of the vector velocities of a complex flow field.