Measurement of absolute flow velocity vector using dual-angle, delay-encoded Doppler optical coherence tomography.
Single-beam laser Doppler measurements of flow velocity are only sensitive to the velocity component parallel to the optical axis. We describe a simple modification to a standard Doppler optical coherence tomography (OCT) system using a single sample beam that provides velocity information from multiple angles within the beam. By introducing a glass plate midway into the OCT beam path, the sample beam is divided into several components, each with a different group delay and each providing a separate interferogram with its own effective Doppler angle. By combining the Doppler shift measured in each of these component interferograms, the flow velocity vector is fully determined.
Pedersen
Cameron J
CJ
Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7207, USA.
Huang
David
D
Shure
Mark A
MA
Rollins
Andrew M
AM
D021621:Imaging, Three-Dimensional; D015233:Models, Statistical; D016011:Normal Distribution; D019047:Phantoms, Imaging; D041623:Tomography, Optical Coherence / Q000295:instrumentation* / Q000379:methods*