Comparison of algorithms to suppress
artifacts from the natural lens in fluorescence
lifetime imaging ophthalmoscopy (FLIO)
Version 2 2020-09-15, 17:35
Version 1 2020-09-15, 17:34
Posted on 2020-09-15 - 17:35
Fluorescence lifetime imaging ophthalmoscopy (FLIO) has developed as a new
diagnostic tool in ophthalmology. FLIO measurements are taken from 30° retinal fields in two
spectral channels (SSC: 498–560 nm, LSC: 560–720 nm). Because of the layered structure of
the eye, the detected signal is an interaction of the fluorescence decay of the anterior part and
of the fundus. Comparing FLIO measurements before and after cataract surgery, the impact of
the natural lens was proven, despite the application of a confocal laser scanning (cSLO)
technique. The goal of this work was to determine the best algorithmic solution to isolate the
sole fundus fluorescence lifetime from the measured signal, suppressing artifacts from the
natural lens. Three principles based on a tri-exponential model were investigated: a tailfit, a
layer-based approach with a temporally shifted component, and the inclusion of a separately
measured fluorescence decay of the natural lens. The mean fluorescence lifetime τm,12 is
calculated using only the shortest and the middle exponential component. τm,all is calculated
using all three exponential components. The results of tri-exponential tailfit after cataract
surgery were considered as a reference. In SSC, the best accordance of τm,all with the reference
was determined with τm,12 of the tailfit before surgery. If high-quality natural lens
measurements are available, the correspondence of τm,12 is best with τm,all of the reference. In
LSC, there is a good accordance for all models between τm,12 before and after surgery.
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Schweitzer, Dietrich; Haueisen, Jens; Brauer, Jakob; Hammer, Martin; Klemm, Matthias (2020). Comparison of algorithms to suppress
artifacts from the natural lens in fluorescence
lifetime imaging ophthalmoscopy (FLIO). Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.5086553.v2
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AUTHORS (5)
DS
Dietrich Schweitzer
JH
Jens Haueisen
JB
Jakob Brauer
MH
Martin Hammer
MK
Matthias Klemm