Guidelines For Raster Scans - Zeiss CIRRUS HD-OCT 500 User Manual

CIRRUS HD-OCT User Manual
single high definition line. The scan can be positioned anywhere on the fundus image
and has an adjustable line length of 3, 6, or 9 mm, an adjustable angle of –89 to 90
degree, and adjustable spacing from 0 to 1.25 mm in increments of 0.025 mm.
• 5 Line Raster: This scan is the original version of the 5 line raster with less resolution
than the HD 5 Line Raster. The scan can be positioned anywhere on the fundus image
and has an adjustable line length of 3, 6, or 9 mm, an adjustable angle of –89 to 90
degree, and adjustable spacing from 0 to 1.25 mm in increments of 0.025 mm.
•
NOTE: HD 1 Line x100, HD 21 Line, HD Cross, and HD Radial scans are offered as an option
that may not be available in all markets and,when available in a market, may not be on all
instruments. If you do not have this feature and want to purchase it, contact Zeiss. In the
U.S.A., call 1-877-486-7473; outside the U.S.A., contact your local Zeiss distributor.

Guidelines for Raster Scans

For HD 5 Line scans, to switch between the HD 1 20x single line and multi–line scanning,
click the Toggle Spacing button located below the fundus image.
The toggle button remains available until the Single Line scan pattern is moved in the
acquisition window. To move the scan pattern and keep the button active, switch to 5 Line
mode before moving the scan pattern, and then switch back to Single Line mode. If you
move the Single Line pattern and want to switch back to 5 Line mode, just collapse the
scan.
NOTE: Sometimes switching from Color OCT to black and white (
more details in a high–resolution scan.
Scan Pattern Adjustments
Raster scans have adjustable scan patterns. You can use the image pattern controls on the
live Fundus image (Fundus Viewport, Posterior Scans) to manually change line length, line
spacing, or angle of rotation. You can also use the Custom Scan Pattern dialog box.
Adjustments apply to all scan lines.
If you adjust the scan pattern position, check that the retinal OCT B-scan images are not
too high in the viewport. When the edges of scan images are near the upper boundary,
they tend to fold over, reflecting a mirror image back into the viewport. If this occurs, or if
the scan image is completely inverted, adjust the image position using the Center controls.
Posterior Segment Scans
) will allow you to see
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