Intersession repeatability of macular thickness measurements with the Humphrey 2000 OCT

Dara Koozekanani, Cynthia Roberts, Steven E. Katz, Ed E. Herderick

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Abstract

PURPOSE. This study was designed to determine intersession repeatability of measurements of macular thickness made with a commercially available optical coherence tomography (OCT) system. The images that can be routinely acquired with the commercial instrument differ significantly in quality from the images in the literature, which have mostly been acquired on prototype systems. METHODS. Multiple OCT images of the nasal macula were obtained from the right eye during three independent measuring sessions, using the Humphrey 2000 OCT system (Humphrey, San Leandro, CA). Twenty-six volunteers with no history of ocular disease participated in this investigation. Eyes in all subjects were undilated during scan acquisition. Scans were horizontal, 3 mm long, and through the fovea. Five scans were used from each session, for a total of 15 scans per subject. Retinal boundaries were automatically detected using custom software. Statistical software was used to calculate intersession and intrasession repeatability. Manual correction was performed on the automatically detected boundaries, and a second analysis was performed using these boundaries. RESULTS. When no manual correction of boundaries was performed, there were no significant effects between different sessions (P = 0.529) or between different scans within the same session (P = 0.509). Average retinal thickness was found to be 274 ± 17 μm for a 1-mm long region 0.75 mm from the fovea. Individual scan averages differed from overall patient averages by 0 ± 4.3 μm (99% confidence interval, 11.2 μm). CONCLUSIONS. OCT measurements of macular thickness made with the Humphrey 2000 OCT system are repeatable over different sessions with an expected variation of less than 11 μm (99% confidence interval).

Original languageEnglish (US)
Pages (from-to)1486-1491
Number of pages6
JournalInvestigative Ophthalmology and Visual Science
Volume41
Issue number6
StatePublished - May 25 2000

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Optical Coherence Tomography
Software
Confidence Intervals
Eye Diseases
Nose
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Intersession repeatability of macular thickness measurements with the Humphrey 2000 OCT. / Koozekanani, Dara; Roberts, Cynthia; Katz, Steven E.; Herderick, Ed E.

In: Investigative Ophthalmology and Visual Science, Vol. 41, No. 6, 25.05.2000, p. 1486-1491.

Research output: Contribution to journalArticle

Koozekanani, Dara ; Roberts, Cynthia ; Katz, Steven E. ; Herderick, Ed E. / Intersession repeatability of macular thickness measurements with the Humphrey 2000 OCT. In: Investigative Ophthalmology and Visual Science. 2000 ; Vol. 41, No. 6. pp. 1486-1491.
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abstract = "PURPOSE. This study was designed to determine intersession repeatability of measurements of macular thickness made with a commercially available optical coherence tomography (OCT) system. The images that can be routinely acquired with the commercial instrument differ significantly in quality from the images in the literature, which have mostly been acquired on prototype systems. METHODS. Multiple OCT images of the nasal macula were obtained from the right eye during three independent measuring sessions, using the Humphrey 2000 OCT system (Humphrey, San Leandro, CA). Twenty-six volunteers with no history of ocular disease participated in this investigation. Eyes in all subjects were undilated during scan acquisition. Scans were horizontal, 3 mm long, and through the fovea. Five scans were used from each session, for a total of 15 scans per subject. Retinal boundaries were automatically detected using custom software. Statistical software was used to calculate intersession and intrasession repeatability. Manual correction was performed on the automatically detected boundaries, and a second analysis was performed using these boundaries. RESULTS. When no manual correction of boundaries was performed, there were no significant effects between different sessions (P = 0.529) or between different scans within the same session (P = 0.509). Average retinal thickness was found to be 274 ± 17 μm for a 1-mm long region 0.75 mm from the fovea. Individual scan averages differed from overall patient averages by 0 ± 4.3 μm (99{\%} confidence interval, 11.2 μm). CONCLUSIONS. OCT measurements of macular thickness made with the Humphrey 2000 OCT system are repeatable over different sessions with an expected variation of less than 11 μm (99{\%} confidence interval).",
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