Zeiss CIRRUS HD-OCT 500, User Manual

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Posterior Segment Scans
2660021169012 Rev. A 2017-12 CIRRUS HD-OCT User Manual
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the scan pattern. In addition, the scan pattern overlay consists of concentric rings to assist
in the alignment of the optic disc (see
Figure 6-17 ).
Integration
For an integrated view, both the Macular Cube scan and Optic Disc Cube scan are used.
Macular and Optic Disc Cube Scans
For an integrated view, the Macular Cube (512x128 mm or 200x200 mm) and Optic Disc
Cube (200x200 mm) scans are generated by combining a series of A-scans taken at varying
depths. Macular and Optic Disc Cube scans provide information about disc and fovea
parameters including (but not limited to):
• Size
• Cup, disc, rim area and volume
• Nerve fiber layer thickness
• Ganglion cell layer thickness (macular cube)
In turn, the post processing tools available for scan analysis Chapter 8 "Analysis"
provide tools for RNFL and Ganglion cell layer estimation, which provide the earliest
warnings of glaucoma and other, neuro-ophthalmic conditions.
Cube scans are the most common acquisition types, and are used as the basis for the
largest number of CIRRUS HD-OCT analyses (see
Table 8-1 ).
Depending on your requirements, you can specify cube scans based on several geometries:
Visualization
For a visualized view, either the Macular Cube scan or Optic Disc Cube scan is used.
Macular or Optic Disc Cube Scans
For an visualized view, either the Macular Cube (512x128 mm or 200x200 mm) or Optic
Disc Cube (200x200 mm) scan is generated. See the previous sections for information
about the two scans.
Raster Scans
• HD 5 Line Raster and HD 1 Line 20x: This is a single scan that generates 5 parallel
B-scans composed of 1024 A-scans each, with an option to collapse the 5 lines into a
Optic Disc Cube 200x200