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Posterior Segment
2660021169012 Rev. A 2017-12
CIRRUS HD-OCT User Manual
8-14
Select Review Registration to view the manually adjusted overlay. Use the slider above the
overlay, as needed, to change the transparency to see more of Image 1 or Image 2. By
moving the slider back and forth, you can see if blood vessels or other features from one
image align with the identical features in the other image. To return the registration to the
original setting, click the Reset Overlay button. If you are not satisfied with the positioning
of the points, click the Undo button
to delete all points and then make new point
selections.
Darker areas on the lower registration screen occur where there is no data to compare. This
will occur when the data points selected create an offset of the images. To see the final
registered image, move the slider all the way to the right. This black border will also be
seen on the thickness map and the thickness difference map on the MCA screen. When
you are satisfied with the resulting overlay, select OK. To reset the values to the original
registration, click Cancel.
NOTE: If you or another user have changed the fovea location for any exam while carrying
out Macula Thickness Analysis and the result has been saved, then that will be the fovea
location will be loaded.
No Registration
When No Registration is applied, the initial location of the ETDRS grid center for both
scans is taken from the value for the previous scan.
The ETDRS Grid position circle is automatically positioned over the Fundus image of the
older scan data. You can adjust this position by clicking anywhere within the OCT scan
boundary, and dragging the ETDRS Grid to a new position. Thickness values are
automatically recalculated corresponding to the new ETDRS Grid position.
The Thickness Difference Map is seen at the far right of the display. It displays the thickness
differences between the two scan dates (current thickness minus prior thickness, in
micrometers) at each pixel location. The difference map has a different color scale to
represent the thickness change. This color map is indicated to the right. Warmer colors
indicate an increase in the thickness; cooler colors indicate a decrease in thickness. The
transparency slider beneath each overlay can be adjusted, as required, to enhance the image.
Summary of Contents for CIRRUS HD-OCT 500
Page 1: ...2660021156446 B2660021156446 B CIRRUS HD OCT User Manual Models 500 5000 ...
Page 32: ...User Documentation 2660021169012 Rev A 2017 12 CIRRUS HD OCT User Manual 2 6 ...
Page 44: ...Software 2660021169012 Rev A 2017 12 CIRRUS HD OCT User Manual 3 12 ...
Page 58: ...User Login Logout 2660021169012 Rev A 2017 12 CIRRUS HD OCT User Manual 4 14 ...
Page 72: ...Patient Preparation 2660021169012 Rev A 2017 12 CIRRUS HD OCT User Manual 5 14 ...
Page 110: ...Tracking and Repeat Scans 2660021169012 Rev A 2017 12 CIRRUS HD OCT User Manual 6 38 ...
Page 122: ...Criteria for Image Acceptance 2660021169012 Rev A 2017 12 CIRRUS HD OCT User Manual 7 12 ...
Page 222: ...Overview 2660021169012 Rev A 2017 12 CIRRUS HD OCT User Manual 9 28 ...
Page 256: ...Log Files 2660021169012 Rev A 2017 12 CIRRUS HD OCT User Manual 11 18 ...
Page 308: ...Appendix 2660021169012 Rev A 2017 12 CIRRUS HD OCT User Manual A 34 ...
Page 350: ...CIRRUS HD OCT User Manual 2660021169012 Rev A 2017 12 I 8 ...
Page 351: ...CIRRUS HD OCT User Manual 2660021169012 Rev A 2017 12 ...