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

Abstract

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. Thanks 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.

References in corpus (6)

• In vivo laser Doppler holography of the human retina
• Choroidal vasculature imaging with laser Doppler holography
• Holographic laser Doppler imaging of microvascular blood flow
• Waveform analysis of human retinal and choroidal blood flow with laser Doppler holography
• Holographic laser Doppler ophthalmoscopy
• High speed optical holography of retinal blood flow

Cited by in corpus (1)

• Laser Doppler holography of the anterior segment for blood flow imaging, eye tracking, and transparency assessment