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 6-1).
Figure 6-1. Inner retina. (A) Superficial capillary plexus. (B) Deep capillary plexus. Outer retina. (C) Outer retina. (D) Choriocapillaris.
STEP-BY-STEP ANALYSIS OF ANGIOGRAPHY IN OUTER RETINAL DISORDERS
Step 1: Evaluate the Optical Coherence Tomography Angiograms and B-Scans
Focus on the outer retinal slabs: Outer retina/avascular zone and choriocapillaris.
- Evaluate the outer retinal slab. The outer plexiform layer (anterior red line) to Bruch’s membrane (posterior red 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.
- Evaluate the choriocapillaris slab. The red contour lines on the B-scan will bracket the choriocapillaris. 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 6-2).
Figure 6-2. (A) Outer retina. (B) Choriocapillaris. (C and D) Red and green calipers.
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