Chapter 2 - Introduction
Depending on the configuration of your device the following image modalities may be available:
2.7.3.1 SLO imaging modalities
optomap
optomap is an ultra-widefield (UWF) color fundus image.
optomap combines neurosensory retinal and choroidal reflectance images and provides UWF image
views from a single capture action:
l optomap color view – an UWF color fundus image combining red and green reflectance images.
l optomap neurosensory retinal view – an UWF green laser reflectance image of the surface retina.
l optomap choroidal view – an UWF red laser reflectance image of the deeper retina.
optomap af
optomap af is an UWF green laser auto fluorescence image.
optomap fa
optomap fa is an UWF fluorescein angiography (FA) image.
optomap icg
optomap icg is an UWF indocyanine green (ICG) angiography image.
optomap plus
l optomap plus is a higher resolution option which is available for optomap color reflectance and
optomap af modalities.
l optomap fa and optomap icg are captured at the optomap plus resolution.
l optomap plus is captured at resolution x1.5 that of the standard resolution optomap.
2.7.3.2 OCT imaging modalities
CAUTION
Measurements on Optos UWF optomap and OCT images are based on scale factors
derived from the wide-angle schematic eye model published by Navarro et al
1.
. This
model describes a spherical 24mm representation and is embodied into the DICOM
encoding Supplement 173: Wide Field Ophthalmic Photography Image Storage SOP
Classes.
Optos OCT line scan
The scanner moves back and forth along the line of a selected location on the retina (fundus) and
generates a cross-sectional OCT image. The line scan is 48 degrees (14 mm) in length.
The Optos OCT line scan mode lets you capture cross sectional B-Scan OCT images of the vitreo-retina,
retina and choroid-retina structures.
This scan is also known as a B-scan OCT.
1.
Isabel Escudero-Sanz and Rafael Navarro, "Off-axis aberrations of a wide-angle schematic eye model," J. Opt. Soc. Am. A 16, 1881-1891 (1999).
Part Number: G110230-003-ENG Page 25 of 84
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