Specialized and Integrative Visualization Tools2660021169012 Rev. A 2017-12 CIRRUS HD-OCT User Manual8-70Slice and Slab OptionsThe lower right viewport, Figure 8-52, has a drop–down menu to select Slice (default),Slab, ILM, RPE, or RPEfit.cáÖìêÉ=UJRO=^å~äóëáë=ëÅêÉÉå=ëÜçïáåÖ=~=pä~ÄWhen you select Slab, the other two scan viewports show two same–color dashed linesseparated by a small distance. This separation is the slab thickness, which you can adjustin either of the other viewports by dragging the posterior line by its handle on the edge.Dragging the anterior line handle moves both lines of the slab together to reposition it inthe scan image. The resulting slab image you see represents an average signal intensityvalue for each A-scan location through the selected depth of the slab.The drop–down options ILM, RPE, and RPEfit are variations of the slab. When you selectany of these, you view the slab (of selected thickness—you can adjust it as above) relativeto the selected layer. For example, if you select ILM (Figure 8-52), a dashed line of thesame color as the ILM appears posterior to it, and the resulting scan image appears in thelower right viewport (and in the scan cube overlay when Slab is selected there). You cannotraise the lower dashed line above the upper one, and the minimum separation is2 μm.
