May 2004
Volume 45, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2004
Choroidal Thickness Measurement Using Tissue Identification with High Frequency Ultrasound
Author Affiliations & Notes
  • R. Chan
    Ophthalmology, Weill Medical College of Cornell University, New York, NY
  • D. Coleman
    Ophthalmology, Weill Medical College of Cornell University, New York, NY
  • M.J. Rondeau
    Ophthalmology, Weill Medical College of Cornell University, New York, NY
  • R.H. Silverman
    Ophthalmology, Weill Medical College of Cornell University, New York, NY
  • H.O. Lloyd
    Ophthalmology, Weill Medical College of Cornell University, New York, NY
  • F.L. Lizzi
    Biomedical Engineering, Riverside Research Institute, New York, NY
  • Footnotes
    Commercial Relationships  R. Chan, None; D. Coleman, None; M.J. Rondeau, None; R.H. Silverman, None; H.O. Lloyd, None; F.L. Lizzi, None.
  • Footnotes
    Support  none
Investigative Ophthalmology & Visual Science May 2004, Vol.45, 3015. doi:
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      R. Chan, D. Coleman, M.J. Rondeau, R.H. Silverman, H.O. Lloyd, F.L. Lizzi; Choroidal Thickness Measurement Using Tissue Identification with High Frequency Ultrasound . Invest. Ophthalmol. Vis. Sci. 2004;45(13):3015.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Abstract: : Purpose: Identify the anterior and posterior boundaries of the choroid in–vivo in order to quantify choroidal thickness variation in such diseases or states as myopia, hypotony, endophthalmitis and tumors. Methods: Subjects were scanned with a 20 MHz ultrasound digital scanner with individual scans taken throughout the cardiac cycle. Using power spectrum analytical techniques, the posterior boundary of the choroid can be distinguished from the sclera in the region of the lamina fusca. Sequential OCT measurements were used to aid in quantifying choroidal thickness when media were optically clear. Results: The choroidal thickness and its variation in time can be quantified far more accurately than with conventional B–scan techniques. Clinical utility in evaluating small melanomas versus nevi and endophthalmitis versus hemorrhagic change were documented. Conclusions: The use of digital evaluation of rf ultrasound data were useful in augmenting clinical observation and routine B–scan data.

Keywords: imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • choroid • retina 
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