NORMAL ANGIOGRAM/SPECTRAL-DOMAIN OPTICAL COHERENCE TOMOGRAPHY B-SCAN
In order to identify abnormalities, it is always important to remember what normal looks like (Figure 5-1).
Figure 5-1. Inner retina. (A) Superficial capillary plexus. (B) Deep capillary plexus. Outer retina. (C) Outer retina. (D) Choriocapillaris.
STEP-BY-STEP ANALYSIS OF ANGIOGRAPHY IN INNER RETINAL DISORDERS
Step 1: Evaluate the Optical Coherence Tomography Angiograms and B-Scans
Focus on the inner retinal slabs: Superficial capillary plexus (SCP) and deep capillary plexus (DCP).
- Select the SCP. The internal limiting membrane (red line) to inner plexiform layer (green line) will be bracketed on the B-scan to highlight the anatomical layers perfused by this plexus. Structure and perfusion can be visualized in tandem over the area of abnormality. The red and green calipers can be manually adjusted for dynamic visualization of the B-scan.
- Select the DCP. The inner plexiform layer (anterior green line) to the outer plexiform layer (posterior green line) will be bracketed on the B-scan to highlight the anatomical layers perfused by this plexus. Structure and perfusion can be visualized in tandem over the area of abnormality. The red and green calipers can be manually adjusted for dynamic visualization of the B-scan (Figure 5-2).
Figure 5-2. (A) SCP. (B) DCP. (C and D) Red and green calipers.
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