Reverse contrast laser Doppler holography for lower frame rate retinal and choroidal blood flow imaging

Laser Doppler holography (LDH) is an interferometric blood flow imaging technique based on full-field measurements of the Doppler spectrum. LDH has so far been demonstrated in the retina with ultrafast cameras, typically at 75 kHz. We show here that a similar method can be implemented with camera fr...

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Bibliographic Details
Published inOptics letters Vol. 45; no. 14; p. 4012
Main Authors Puyo, Léo, Paques, Michel, Atlan, Michael
Format Journal Article
LanguageEnglish
Published United States 15.07.2020
Subjects
Choroid - blood supply
Choroid - diagnostic imaging
Holography - methods
Humans
Lasers
Retina - diagnostic imaging
Retina - physiology
Retinal Vessels - diagnostic imaging
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Summary:Laser Doppler holography (LDH) is an interferometric blood flow imaging technique based on full-field measurements of the Doppler spectrum. LDH has so far been demonstrated in the retina with ultrafast cameras, typically at 75 kHz. We show here that a similar method can be implemented with camera frame rates 10 times slower than before. Due to energy conservation, low and high frequency local power Doppler signals have opposite variations, and a simple contrast inversion of the low frequency power Doppler reveals fast blood flow beyond the camera detection bandwidth for conventional laser Doppler measurements. Relevant blood flow variations and color composite power Doppler images can be obtained with camera frame rates down to a few kHz.
ISSN:1539-4794
DOI:10.1364/OL.393712