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Updated: Aug 15, 2026

Doppler Optical Coherence Tomography of Retinal Circulation
Published on: September 18, 2012
Chromaticity-coded Doppler blood velocity sonagrams: preliminary observations
S Kontis1, T S Padayachee, R G Gosling
1Department of Radiological Sciences, Guy's Hospital, London, U.K.
Abstract:
This paper describes the application of chromaticity to spectrally analysed Doppler blood velocity signals. Chromaticity enables a particular colour to be assigned to the power/frequency distribution within each instantaneous spectral sweep of a sonagram. Successive spectral sweeps of a sonagram can then be colour-coded in this fashion to produce a chromaticity-coded sonagram. Two chromaticity-coded sonagrams are presented to illustrate various blood flow features. Standard sonagram display formats are also presented for comparison purposes. It appears that the chromaticity-coded sonagram offers the ability to digitally encode the instantaneous power spectral distribution with a single chromaticity vector.
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