Retinal Blood Velocity Measurements using Laser Speckle Imaging

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Physiology

Background:

• Retinal blood velocity is a critical indicator of ocular health.
• Laser speckle imaging (LSI) offers a non-invasive method for assessing blood flow.
• Understanding factors influencing retinal hemodynamics is essential for diagnosing and managing eye diseases.

Purpose of the Study:

• To investigate the relationship between blood oxygen saturation and retinal blood velocity.
• To evaluate the efficacy of a modified fundus camera for LSI-based velocity measurements.
• To establish a preclinical model for studying retinal blood flow dynamics.

Main Methods:

• Utilized a modified fundus camera system for laser speckle imaging.
• Acquired retinal blood velocity data in a rabbit model.
• Systematically varied blood oxygen saturation levels to observe effects on flow.

Main Results:

• Demonstrated successful measurement of retinal blood velocity using LSI.
• Observed a correlation between altered blood oxygen saturation and changes in retinal blood velocity.
• The modified fundus camera provided reliable velocity data.

Conclusions:

• Laser speckle imaging is a viable technique for quantifying retinal blood velocity.
• Blood oxygen saturation is a significant determinant of retinal blood flow.
• This rabbit model provides a valuable platform for further research into retinal vascular regulation.