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Updated: Aug 13, 2026

Doppler Optical Coherence Tomography of Retinal Circulation
Published on: September 18, 2012
Comparison of conventional and transverse Doppler sonograms
K S Dickerson1, V L Newhouse, P Tortoli
1Biomedical Engineering and Science Institute, Drexel University, Philadelphia, Pennsylvania 19104.
Abstract:
When measuring flow velocity using the conventional ultrasonic Doppler effect, beam axis-to-flow angles approaching 90 degrees are avoided as the Doppler spectrum frequency shift is known to go to zero at this angle. In this paper, the conventional Doppler technique is compared with the transverse Doppler method, in which the Doppler spectrum bandwidth is used to estimate flow, allowing flow to be probed at 90 degrees. The comparison is made using a moving thread flow phantom capable of executing various velocity profiles. This technique may allow the probing of vessels that are inaccessible to conventional oblique probing, thus complementing the conventional Doppler technique.
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