May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Measurement of Flow in Retinal Vascular Disease Using Digital Fluorescein Angiography
N. Nguyen; G. Wu; D. A. Lee; B. Tate; R. Garcia; J. Lee; G. J. Tso; Q. Nguyen; P. N. Nguyen
Author Affiliations & Notes
  • N. Nguyen
    Biology, De Anza College, Cupertino, California
  • G. Wu
    Ophthalmology, Stanford University School of Medicine, Stanford, California
  • D. A. Lee
    Ophthalmology, University of Texas, Houston, Texas
  • B. Tate
    Economics, San Diego State University, San Diego, California
  • R. Garcia
    Applied Mathematics,
    University of California, Berkeley, Berkeley, California
  • J. Lee
    School of Engineering, University of California, Los Angeles, Los Angeles, California
  • G. J. Tso
    School of Engineering,
    University of California, Berkeley, Berkeley, California
  • Q. Nguyen
    Biology, University of California, Irvine, Irvine, California
  • P. N. Nguyen
    Biological Sciences, University of California, Davis, Davis, California
  • Footnotes
    Commercial Relationships  N. Nguyen, None; G. Wu, None; D.A. Lee, None; B. Tate, None; R. Garcia, None; J. Lee, None; G.J. Tso, None; Q. Nguyen, None; P.N. Nguyen, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 611. doi:
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      N. Nguyen, G. Wu, D. A. Lee, B. Tate, R. Garcia, J. Lee, G. J. Tso, Q. Nguyen, P. N. Nguyen; Measurement of Flow in Retinal Vascular Disease Using Digital Fluorescein Angiography. Invest. Ophthalmol. Vis. Sci. 2008;49(13):611.

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Abstract

Purpose: : We propose a mechanism of measuring blood flow using fluorescein angiography.

Methods: : The equation: Flow=(πr2L)/t (mm3/sec):r=radius of blood vessel, L=length of blood vessel, L= 1000µ, using the splining algorithm of the Topcon camera 50EX system, OIS Winstation-XP 3200 v. 10.2.44. Digital fluorescein angiography (FA) was performed using Sodium Fluorescein 10%. The patient's vein diameter was measured at the 12:00 position of the optic nerve, at the height of venous hyperfluorescence of the digital FA. Time was defined as the difference between the initial hyperfluorescence of the cilioretinal artery, t initial, and the first appearance of a fully hyperfluorescent vein as t final. Visual acuity for the study patients was 20/20 -20/40. We examined digital FA of patients with minimal retinal disease, Controls (C) and patients with previously diagnosed Retinal Vascular Disease (VASC). C diagnoses were central serous choroidopathy, glaucoma suspect, retinal holes. VASC diagnoses were branch retinal vein occlusion, central retinal vein occlusion, diabetic retinopathy and ocular ischemia.

Results: : 18 pts:9C, 9 VASC: C age range= 24-77 yrs, avg= 48.75 yrs +15.9, VASC age range=32-72 yrs, avg=53.75 yrs +14.33( p=ns). Vein diameter: C=146.44µ + 14.04, VASC=143.33µ +11.24 (p=ns). Using the Flow equation: C pts: avg Flow =1742.7 mm3/sec + 605.51; VASC pts: avg Flow=1255.27 mm3/sec +329.99. The C pts had faster flow than those of the VASC pts (p<0.05, t-test).

Conclusions: : The findings suggest an approximation of flow can be performed using standard fluorescein camera equipment and software, found in the offices of retinal specialists. In this small study, Retinal Vascular Disease patients had a slower flow rate than those of the Control patients. In the future, this flow measurement may be useful in the evaluation and management of retinal vascular disease.

Keywords: imaging/image analysis: clinical • clinical (human) or epidemiologic studies: biostatistics/epidemiology methodology • imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) 
© 2008, The Association for Research in Vision and Ophthalmology, Inc., all rights reserved. Permission to republish any abstract or part of an abstract in any form must be obtained in writing from the ARVO Office prior to publication.
Copyright © 2025 Association for Research in Vision and Ophthalmology.
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