Regularized Estimation of Retinal Vascular Oxygen Tension From Phosphorescence Images

Isa Yildirim*, Isa Yildirim*, Rashid Ansari, Mahnaz Shahidi, Imam Samil Yetik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The level of retinal oxygenation is potentially an important cue to the onset or presence of some common retinal diseases. An improved method for assessing oxygen tension in retinal blood vessels from phosphorescence lifetime imaging data is reported in this paper. The optimum estimate for phosphorescence lifetime and oxygen tension is obtained by regularizing the leastsquares (LS) method. The estimation method is implemented with an iterative algorithm to minimize a regularized LS cost function. The effectiveness of the proposed method is demonstrated by applying it to simulated data as well as image data acquired from rat retinas. The method is shown to yield estimates that are robust to noise and whose variance is lower than that obtained with the classical LS method.

Original languageEnglish
Pages (from-to)1989-1995
Number of pages7
JournalIEEE Transactions on Biomedical Engineering
Volume56
Issue number8
DOIs
Publication statusPublished - Aug 2009

Funding

FundersFunder number
National Eye InstituteP30EY001792

    Keywords

    • Phosphorescence lifetime imaging
    • regularized least squares (RLSs)
    • retinal oxygen tension analysis

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