1. Articles from Nikolaus Dragostinoff

    1-3 of 3
    1. Measurement of Absolute Blood Flow Velocity and Blood Flow in the Human Retina by Dual-beam Bidirectional Doppler Fourier-Domain Optical Coherence Tomography

      Measurement of Absolute Blood Flow Velocity and Blood Flow in the Human Retina by Dual-beam Bidirectional Doppler Fourier-Domain Optical Coherence Tomography

      Purpose The present experiments were undertaken to evaluate the validity of absolute flow velocity measurements using a dual-beam bidirectional Doppler Fourier-domain optical coherence tomography (FD-OCT) system. Methods The flow velocities of diluted milk through a glass capillary were measured at 30 different preset velocities in the range of 0.9 to 39.3 mm/s by bidirectional Doppler FD-OCT. The flow through the capillary was controlled by two infusion pumps working in different flow ranges and based on different technical principles. In vivo the validity of the method for measuring blood flow in retinal vessels was tested at bifurcations. The ...

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    2. In vivo bi-directional Doppler Fourier-domain optical coherence tomography for measurement of absolute flow velocities

      A bidirectional FDOCT system capable of measuring absolute velocities of moving scatterers is described. In this setup the sample is illuminated with two differently polarized beams. These two probe beams impinging onto the sample at a known angle. The velocity estimation is independent of the exact direction of the velocity vector in the detection plane. Evaluation measurements were performed on a rotating disc driven at well defined velocities and tilted by various small angles around to /2. Our results indicate a high correlation between pre-set and estimated velocities and the independency of these velocities from the tilting angle of the ...
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    3. Bidirectional Doppler Fourier-domain optical coherence tomography for measurement of absolute flow velocities in human retinal vessels

      Bidirectional Doppler Fourier-domain optical coherence tomography for measurement of absolute flow velocities in human retinal vessels
      We describe a bidirectional color Doppler Fourier-domain optical coherence tomography system capable of measuring absolute velocities of moving scatterers by illuminating the sample with two linearly and orthogonally polarized beams, incident at a known angle on the sample. The velocity calculation is independent of the exact orientation of the velocity vector in the detection plane. First measurements were performed on a rotating disk driven at well-defined velocities and tilted by various small angles. Our results indicate a high correlation between preset and calculated velocities (correlation coefficient 0.999) and the independency of these velocities from the tilting angle of the ...
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    1-3 of 3
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  2. Topics in the News

    1. (3 articles) Medical University of Vienna
    2. (3 articles) Rainer A. Leitgeb
    3. (2 articles) Erich Götzinger
    4. (2 articles) Christoph K. Hitzenberger
    5. (2 articles) Michael Pircher
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