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Journal of Biomedical Optics

Accuracy of retinal oximetry: a Monte Carlo investigation
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Paper Abstract

Retinal hemoglobin oxygen saturation (sO 2 ) level is believed to be associated with the pathophysiology of several leading blinding diseases. Methods to properly measure retinal sO 2 have been investigated for decades; however, the accuracy of retinal oximetry is still considered to be limited. The Monte Carlo simulation of photon transport in retina to examine how the accuracy of retinal oximetry is affected by local parameters is discussed. Fundus photography was simulated in a multilayer retinal model, in which a single vessel segment with 0.7  sO 2 was embedded, at six optical wavelengths. Then, 200 million photons were traced in each simulation to ensure statistically stable results. The optical reflectance and energy deposit were recorded to measure sO 2 using both the reflection method (existing retinal oximetry) and a new absorption method, photoacoustic ophthalmoscopy (PAOM). By varying the vessel diameter and melanin concentration in the retinal pigment epithelium, the relative error of sO 2 measurement in the reflection method increased with increasing vessel diameter and melanin concentration; in comparison, the sO 2 measurement was insensitive to these two parameters in PAOM. The results suggest that PAOM potentially can be a more accurate tool in quantifying retinal sO 2 .

Paper Details

Date Published: 3 June 2013
PDF: 11 pages
J. Biomed. Opt. 18(6) 066003 doi: 10.1117/1.JBO.18.6.066003
Published in: Journal of Biomedical Optics Volume 18, Issue 6
Show Author Affiliations
Wenzhong Liu, Northwestern Univ. (United States)
Shuliang Jiao, Florida International Univ. (United States)
Hao F. Zhang, Northwestern Univ. (United States)

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