Zeiss CIRRUS HD-OCT 500, User Manual

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Posterior Segment
2660021169012 Rev. A 2017-12 CIRRUS HD-OCT User Manual
8-26
Table 8-2 Preset Slab Locations for the En Face Analysis
En Face Preset Description Default Settings
VRI
(Vitreoretinal
Interface)
Designed to highlight disorders
of the VRI, such as epiretinal membranes
(ERM) and vitreomacular traction (VMT).
Vitreous attachments show as bright areas,
while macular pucker appears as variations in
the background intensity. Upper: 133 μ m above the ILM layer
Lower: 33 μ m below the ILM layer
Mid–Retina Highlights fluid and exudates occurring
roughly in the general region from the Inner
Nuclear Layer to the Outer Nuclear Layer. It
follows contours that are fractions of the
distance between ILM and RPE. Central 1/3 of retinal thickness based
on the ILM and RPE layers
IS/OS–Ellipsoid Highlights disruptions to the IS/OS – Ellipsoid
Zone. It follows the RPE contour and is
elevated slightly to put it at the level of the
IS/OS – Ellipsoid Zone.
Disturbances to the IS/OS – Ellipsoid Zone
show as dark areas. Upper: 44 μ m above the RPE layer
Lower: 22 μ m above the RPE layer
Choroid Highlights Choroidal vasculature. It is placed
below the RPE Fit, at the general level of
Haller's Layer, deep in the choroid. Since
choroid thickness can vary from patient to
patient, this level may need to be adjusted.
Vessels appear as dark areas, and areas of
RPE disturbance such as GA may appear as
bright areas. Upper: 72 μ m below the RPE Fit layer
Lower: 128 μ m below the RPE Fit layer
Minimum Intensity
Projection (Min-IP) Shows patterns of minimum scan intensity
within the retina. Areas that appear dark may
indicate fluid build-up, and areas that appear
bright may indicate disruption of the retina.
The Min-IP Preset allows the user to evaluate
these areas in an en face view and to quickly
identify B-scans that may show fluid or other
disruptions. Upper: 90% ILM + 10% RPE Layers
Lower: RPE Layer