4 March 2016 Total retinal blood flow and reproducibility evaluation by three beam optical Doppler tomography
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Proceedings Volume 9693, Ophthalmic Technologies XXVI; 969302 (2016) https://doi.org/10.1117/12.2210910
Event: SPIE BiOS, 2016, San Francisco, California, United States
Abstract
We present a three beam optical Doppler tomography (ODT) technique suitable for 3-D velocity and flow measurements to evaluate total retinal blood circulation from and to the optic nerve head (ONH). The system consists of three independent ODT channels. Superluminescent diodes with a central wavelength of 840 nm and a spectral bandwidth of 50 nm were used. The sources are coupled to collimators resting in a specially designed mount to ensure a well-defined beam geometry, necessary for the full reconstruction of the three dimensional velocity vector. The reconstruction works without prior knowledge on the vessel geometry, which is normally required for ODT systems with less than three beams. The beams share a common bulk optics Michelson interferometer, while the detection comprises three identical spectrometers with a line scan rate of 50 kHz. 20 eyes of healthy volunteers were imaged with the 3 beam ODT, employing a circular scan pattern around the ONH. The mean total blood flow was calculated for arteries (47.1 ± 2.4 μl/min (mean ± SD)) and veins (47.1 ± 2.7 μl/min μl/min) independently. The two results showed no significant difference (paired t-test, p < 0.96), rendering both equally reliable for total flow measurements. Furthermore the reproducibility of the method was evaluated for the total flow and flow, velocities within each individual vessel of 6 eyes. The average variation for total flow measurements is sufficiently low to detect deviations of ~ 6% indicating high precision of the proposed method.
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Richard Haindl, Wolfgang Trasischker, Andreas Wartak, Bernhard Baumann, Michael Pircher, Christoph K. Hitzenberger, "Total retinal blood flow and reproducibility evaluation by three beam optical Doppler tomography", Proc. SPIE 9693, Ophthalmic Technologies XXVI, 969302 (4 March 2016); doi: 10.1117/12.2210910; https://doi.org/10.1117/12.2210910
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