title: Three-beam Doppler optical coherence tomography using a facet prism telescope and MEMS mirror for improved transversal resolution.
abstract: An improved three-beam Doppler optical coherence tomography system was developed. It utilizes a custom-made three-facet prism telescope to improve the transversal resolution at the sample. Furthermore, a two-axis gimbal-less MEMS mirror is used to minimize off-pivot beam movement at the pupil of the eye, enabling circular scanning forin vivoretinal measurements. We demonstrate the system's abilities forin vitrocircular scanning to measure absolute flow and to reconstruct the full velocity vector on a bifurcation flow phantom. Moreover,in vivoretinal measurements using circular scanning around vessel bifurcations of healthy human volunteers were performed. Measurements of the absolute mean flow and its orientation are in good agreement with the expected values forin vitromeasurements. Forin vivomeasurements, the in- and outflow of blood for retinal vessel bifurcations show an excellent agreement, demonstrating the reliability of the technique.
authors.affiliation: Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria.
authors.forename: R
authors.initials: R
authors.lastname: Haindl
authors.affiliation: Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria.
authors.forename: W
authors.initials: W
authors.lastname: Trasischker
authors.affiliation: Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria.
authors.forename: B
authors.initials: B
authors.lastname: Baumann
authors.affiliation: Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Pircher
authors.affiliation: Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria.
authors.forename: C K
authors.initials: CK
authors.lastname: Hitzenberger
keywords: Doppler; flow measurement; multibeam; optical coherence tomography; retina