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  • Title: Segmental reproducibility of retinal blood flow velocity measurements using retinal function imager.
    Author: Chhablani J, Bartsch DU, Cheng L, Gomez L, Alshareef RA, Rezeq SS, Garg SJ, Burgansky-Eliash Z, Freeman WR.
    Journal: Graefes Arch Clin Exp Ophthalmol; 2013 Dec; 251(12):2665-70. PubMed ID: 23700326.
    Abstract:
    BACKGROUND: To evaluate the reproducibility of blood flow velocity measurements of individual retinal blood vessel segments using retinal function imager (RFI). METHODS: Eighteen eyes of 15 healthy subjects were enrolled prospectively at three centers. All subjects underwent RFI imaging in two separate sessions 15 min apart by a single experienced photographer at each center. An average of five to seven serial RFI images were obtained. All images were transferred electronically to one center, and were analyzed by a single observer. Multiple blood vessel segments (each shorter than 100 μm) were co-localized on first and second session images taken at different times of the same fundus using built-in software. Velocities of corresponding segments were determined, and then the inter-session reproducibility of flow velocity was assessed by the concordance correlation co-efficient (CCC), coefficient of reproducibility (CR), and coefficient of variance (CV). RESULTS: Inter-session CCC for flow velocity was 0.97 (95% confidence interval (CI), 0.966 to 0.9797). The CR was 1.49 mm/sec (95% CI, 1.39 to 1.59 mm/sec), and CV was 10.9%. The average arterial blood flow velocity was 3.16 mm/sec, and average venous blood flow velocity was 3.15 mm/sec. The CR for arterial and venous blood flow velocity was 1.61 mm/sec and 1.27 mm/sec respectively. CONCLUSION: RFI provides reproducible measurements for retinal blood flow velocity for individual blood vessel segments, with 10.9% variability.
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