Stratus OCT User Manual PN 2660021134133 A
Analyze Scans
5-5
• For the scan image, select Color or Grayscale. Use the sliders to adjust Level, Window
and %
Zoom. Click the Default button to reset the scan image to the default settings.
• Level sets the reflectivity threshold that is filtered out as background noise, and
apportions the color scale according to the relative reflectivity found in the scan
image. At low levels, the scan image appears all white, at high levels, all black.
• Window sets the portion of the color scale that is applied to the scan image
display. At low settings, the scan image appears black and white, at high settings,
red and yellow.
• Select the Log Abs. Reflectance checkbox to display the scan image color scale,
which indicates the reflectivity of the scan image above the background noise.
• For the fundus image, use the sliders to adjust Brightness and Contrast and % Zoom.
The default settings are zero.
Export JPEG
• Click the Export JPEG button to export the selected scan image.
Note: JPEG compression entails loss of image data. Exported JPEG images are not
intended for diagnostic use, but for use in presentations. Each scan image will be
exported in a separate file, which is named by combining the following, in order:
last name, first name, date of birth, date and time of scan, scan type. This is how
Stratus provides the patient and scan data with the image. Note that, if desired, you
can obscure the patient identifying information by changing the file name before
saving.
Exclude Scans from Analysis
Use the SELECTION WINDOW to visually inspect scans for exclusion from the analysis. Click a
thumbnail image to display it full-size.
• By default, the first exam in the exam list is highlighted. Click on the desired exam to
display its images.
• Selected checkboxes indicate which scans are included in the analysis. By default, all
scans are included. Click to deselect the checkbox and exclude a scan from the
analysis.
Note: Most analysis protocols assume or require a predetermined number of scans
in a group. Deselecting scans may prevent the analysis from working. Some analyses
may work with less than the optimal number of scans, but yield output that relies
more on interpolation and may be less accurate in interpolated areas.
Note: When you deselect scans to exclude them from analysis, the Stratus OCT
remembers which scans you have excluded and continues to exclude them from
analysis until you change the scan selection again.
When you have made your selections, click Analyze to proceed with the analysis. If you do
not wish to proceed, click Cancel at any time and return to the M
AIN WINDOW.
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