Table 1

Comparison of OCTA systems for anterior segment imaging

RTVue XR Avanti
RS-3000 Advance
Triton prototype*
DRI-OCT (swept source)
Imaging company Optovue, Fremont, California, USANidek, Gamagori, Aichi, JapanTopcon Corporation, Tokyo, Japan
Scanning speed 70 000 scans/s53 000 scans/s100 000 scans/s
Scanning volume 304×304 A scans256×256 A scans320×320,
512×512 A scans
Algorithm SSADAComplex difference (full spectrum amplitude)OCTA-ratio analysis (full spectrum amplitude)
Type of algorithm AmplitudeAmplitude+phaseAmplitude
Scan area (macula) 3×3, 6×6, 8×8 mm3×3 to 9×9 mm
(12×9 panorama)
3×3, 4.5×4.5 mm
6×6, 9×9 mm
Optical resolution (axial) 3 µm7 µm8 µm
Optical resolution (lateral) 15 µm20 µm20 µm
Light source 840 nm880 nm1050 nm
Axial imaging depth 2–3 mm2.1 mm2.6 mm
Cross-sectional OCTA YesNoYes
Motion correction YesNoNo
Projection artefact removal YesYesYes
Anterior segment function YesNo (prototype)No
Quantitative analysis YesYesYes (prototype)
Comparative follow-up YesNoYes
  • *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.