Zeiss CIRRUS HD-OCT 500, User Manual

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Anterior Segment Scans
2660021169012 Rev. A 2017-12 CIRRUS HD-OCT User Manual
6-6
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Enhanced Depth Imaging (EDI)
Enhanced Depth Imaging (EDI) is an optional mode for single and multi–line raster scans
that improves visibility of structures at the bottom of B-scans.
The signal to noise ratio in OCT scans varies across the axial range. The default CIRRUS
setup is such that the best signal is obtained at the top portion of the scan. Enhanced
Depth Imaging allows you to change the acquisition settings for the raster scans so that
the best signal to noise ratio is obtained at the bottom of the B-scan. This allows you to
obtain an HD image that is optimized in the region that is of interest for a particular scan.
To switch between EDI and standard scanning mode, select the EDI checkbox
below the fundus image.
Anterior Segment Scans
Scan Preparation
Instrument Imaging Process
When an anterior segment scan is selected or external lens mounted:
• The LSO illumination of the retina is turned off.
• The internal fixation target is centered. For all anterior segment scans, the patient sees
the green fixation target against a black background. The flashing red lines showing
the scan pattern of the selected scan type are blurry.
• The iris illumination is dimmed by default to avoid causing pupillary constriction.
• The internal lens audibly clicks as it is brought into position.
Drag blue bar left or right
to adjust line length
Drag blue bar up or down
to adjust line spacing
Drag rotation icon to adjust
the angle of rotation