Zeiss CIRRUS HD-OCT 500, User Manual

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CIRRUS HD-OCT User Manual 2660021169012 Rev. A 2017-12
Overview
9-1
9 CIRRUS OCT Angiography
Overview
CIRRUS OCT Angiography (AngioPlex
®
) provides non-invasive, high quality images of the
retinal and choroidal vasculature. Careful review of CIRRUS OCT Angiography scans should
be carried out before accepting scanned images, as described in "
CIRRUS OCT
Angiography Acceptance Criteria" on page 7-7 . Even after scan acceptance, it is
recommended that, during CIRRUS OCT Angiography image analysis, you re-assess the
possible impact of scan quality, segmentation errors, and decorrelation tails.
Angiography scan slabs can be acquired in 3x3, 6x6, and 8x8 mm, but only 3x3 mm and
6x6 mm scans include the additional metrics available. Montage Angio scan slabs can be
acquired in 6x6 mm and 8x8 mm and analyzed in both. Additionally, ONH Angiography
scan slabs can be acquired in 4.5x4.5 mm and analyzed. AngioPlex scans can be analyzed
using the methods and metrics shown in Table 9-1. These methods are described in the
sections which follow.
Table 9-1 CIRRUS OCT Angiography
CIRRUS OCT Angiography, Montage Angio, and ONH Angiography Analysis
The CIRRUS OCT Angiography Analysis screen ( Figure 9-1 ), Montage Angio Analysis
screen ( Figure 9-2 ), and ONH Angiography Analysis screen ( Figure 9-3 ) are used for the
Angiography Analysis option in CIRRUS OCT.
For all CIRRUS OCT Angiography Analysis options (Angiography, Montage Angio, and ONH
Angiography), the left side of the screen (1) displays pre-defined angiography slabs or
“Presets” (and user-defineable or “custom” presets), which are arranged in 1 or 2 columns.
The preset slabs for both Angiography, Montage Angio, and ONH Angiography are
discussed in detail in "
CIRRUS OCT Angiography Presets" on page 9-4 .
Scan Acquisition Analysis Additional Metrics
Available
Angio Scan
3x3 / 6x6 / 8x8 OCT Angiography
OCT Angiography Change
OCT Angiography Change (
Manual
)
En Face
Vessel / Perfusion Density
Foveal Avascular Zone (FAZ)
Applies to 3x3 mm and
6x6 mm scans only.
Montage Angio
6x6 / 8x8 Montage Angio Analysis
ONH Angiography
4.5x4.5 OCT Angiography
OCT Angiography Change
OCT Angiography Change (
Manual
)
Perfusion Density / Flux Index