Comparison of OCTA systems for anterior segment imaging
| AngioVue RTVue XR Avanti | Angioscan RS-3000 Advance | Triton prototype* DRI-OCT (swept source) | |
| Imaging company | Optovue, Fremont, California, USA | Nidek, Gamagori, Aichi, Japan | Topcon Corporation, Tokyo, Japan |
| Scanning speed | 70 000 scans/s | 53 000 scans/s | 100 000 scans/s |
| Scanning volume | 304×304 A scans | 256×256 A scans | 320×320, 512×512 A scans |
| Algorithm | SSADA | Complex difference (full spectrum amplitude) | OCTA-ratio analysis (full spectrum amplitude) |
| Type of algorithm | Amplitude | Amplitude+phase | Amplitude |
| Scan area (macula) | 3×3, 6×6, 8×8 mm | 3×3 to 9×9 mm (12×9 panorama) | 3×3, 4.5×4.5 mm 6×6, 9×9 mm |
| Optical resolution (axial) | 3 µm | 7 µm | 8 µm |
| Optical resolution (lateral) | 15 µm | 20 µm | 20 µm |
| Light source | 840 nm | 880 nm | 1050 nm |
| Axial imaging depth | 2–3 mm | 2.1 mm | 2.6 mm |
| Cross-sectional OCTA | Yes | No | Yes |
| Motion correction | Yes | No | No |
| Projection artefact removal | Yes | Yes | Yes |
| Anterior segment function | Yes | No (prototype) | No |
| Quantitative analysis | Yes | Yes | Yes (prototype) |
| Comparative follow-up | Yes | No | Yes |
↵*Prototype: not used in this study, but placed in table for comparison, as this is not commercially available for anterior segment imaging.8
OCT, optical coherence tomography; OCTA, optical coherence tomography angiography; SSADA, split-spectrum amplitude-decorrelation angiography.