Clinical Report: Laser Doppler Holography for Quantitative Choroidal Blood Flow Assessment

Overview

Laser Doppler Holography (LDH) is a novel, non-invasive imaging modality that enables high-temporal-resolution, full-field assessment of choroidal blood flow. This systematic review and meta-analysis demonstrate LDH’s ability to quantify choroidal artery diameter, differentiate arterial from venous flow, and provide detailed hemodynamic parameters, supporting its potential clinical utility in chorioretinal diseases.

Background

The choroid is essential for outer retinal oxygenation and nutrition, with blood flow alterations implicated in diseases such as age-related macular degeneration and central serous chorioretinopathy. Existing imaging techniques like fluorescein angiography and OCT angiography have limitations including invasiveness or insufficient temporal resolution to capture pulsatile blood flow dynamics. LDH combines laser Doppler flowmetry with digital holography to non-invasively measure choroidal blood flow with millisecond temporal resolution, enabling detailed visualization of flow waveforms and vessel differentiation.

Data Highlights

Key Findings

• LDH provides full-field, high-temporal-resolution imaging of choroidal blood flow, capturing pulsatile and non-pulsatile components within a cardiac cycle.
• It differentiates arteries from veins using flow waveform characteristics and spectral data.
• LDH delivers quantitative hemodynamic parameters such as vessel diameter and resistivity indices.
• The meta-analysis pooled a mean choroidal artery diameter of 134.2 μm with low heterogeneity, establishing preliminary normative reference values.
• LDH is non-invasive and rapid, offering advantages over dye-based angiography and other imaging modalities lacking temporal resolution.
• The technique can assess blood flow directionality and heterogeneity across vascular beds, supporting its versatility in ocular vascular research.

Clinical Implications

LDH offers clinicians a promising tool for non-invasive, quantitative assessment of choroidal blood flow dynamics with high temporal resolution, potentially improving diagnosis and monitoring of chorioretinal diseases. Its ability to distinguish arterial from venous flow and measure pulsatile changes may enhance understanding of disease pathophysiology and guide therapeutic interventions. Incorporation of LDH into clinical practice could complement existing imaging modalities by providing functional hemodynamic data previously unattainable.

Conclusion

Laser Doppler Holography represents an innovative, reliable imaging modality for detailed quantitative assessment of choroidal blood flow. Its technical capabilities and emerging clinical evidence support its potential role in advancing ocular vascular diagnostics and research.

References

1. Systematic Review Authors/Year -- Evaluation of Laser Doppler Holography for Assessing Choroidal Blood Flow