2.1

OCT Interpretation

OCT interpretation can be both qualitative and quantitative. At present, in order to fully evaluate an OCT image, both are important.

Qualitative Interpretation

In qualitative interpretation, the clinician reviews individual line scans (B-scans) imaging the areas of interest in the retina and makes qualitative assessment of the presence or absence of pathology based on a knowledge of normal anatomy. B-scans can be rendered in a color-coded image or in a gray-scale image representing the reflectivity of the various layers. By comparing line scans performed over time, the course of the underlying disease and its response to treatment can be assessed.

When performing qualitative interpretation, it is important to be aware of the following issues:

▶ Registration: future line scans must be ‘registered’ to past scans. In other words, the examiner must be certain that the precise anatomic area of interest is scanned similarly in future tests. All SD-OCT machines have the capability of registering future line scans to past scans.

▶ Sampling error

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