Table 2. Comparison of four current commercially available OCTA platforms and their various specifications (Information up to date as of January 2017).

Specifications	AngioVue	Angioplex	Spectralis OCTA	SS OCT Angio	Angioscan
OCT platform	AngioVue RTVue XR Avanti	CIRRUS HD-OCT Model 5000	Spectralis OCT-2	DRI-OCT Triton swept source OCT	RS-3000 Advance
Imaging company	Optovue	Carl Zeiss Meditec, Inc	Heidelberg Engineering	Topcon Corporation	Nidek
Place of origin	Fremont, CA, USA	Dublin, CA, USA	Heidelberg, Germany	Tokyo, Japan	Gamagori, Aichi, Japan
Scanning speed	70 000 scans/s	68 000 scans/s	85 000 scans/s	100 000 scans/s	53 000 scans/s
Scanning volume	304 × 304 A scans	245 × 245, 350 × 350 A scans	512 × 512 A scans	320 × 320, 512 × 512 A scans	256 × 256 A scans
Algorithm	SSADA	OMAG	Probalistic model that predicts whether a voxel contained flow or not.	OCTA—ratio analysis (full-spectrum amplitude)	Complex difference (full-spectrum amplitude)
Type of algorithm	Amplitude	Amplitude+phase	Probablistic model	Amplitude	Amplitude +phase
Scan area (macula)	3 × 3, 6 × 6, 8 × 8 mm	3 × 3, 6 × 6, 8 × 8 mm	3 × 3 mm with (5.7 × 5.7) μm/px	3 × 3, 4.5 × 4.5, 6 × 6, 9 × 9 mm	3 × 3–9 × 9 mm (12 × 9 montage)
Optical resolution
Axial	3 μm	5 μm	7 μm	8 μm	7 μm
Lateral	15 μm	15 μm	14 μm	20 μm	20 μm
Light source	840 nm	840 nm	880 nm	1050 nm	880 nm
Axial imaging depth	2–3 mm	2 mm	1.9 mm	2.6 mm	2.1 mm
Automated segmentation options	Superficial retinal capillary plexus Deep retinal capillary plexus Outer retina Choriocapiliaries	Retina depth encoded Vitreo-retinal interface Superficial retina Deep retina Avascular layer Choriocapillaris Choroid	Four presets matching vasculature in retinal nerve fibre layer, ganglion cell layer and bracketing the inner nuclear layer Three presets to cover the retina (superficial, deep vascular plexus and avascular layer)
	Superficial vascular plexus Deep vascular plexus Outer retina Choriocapillaris	Superficial retinal layer Deep retinal layer Avascular Choriocapillaris
Colour coding of segmentations	Yes	Yes	Yes	Yes	Yes
Cross-sectional OCTA image	Yes	Yes	Yes	Yes	No
Eye tracker	Software update for older models Available with newer models	Yes (Fast Trac)	Yes (TruTrack)	Yes (Smart Track)	Yes
Motion correction	Yes (motion tracker)	N/A	Covered by TruTrack	Yes	Yes (real-time SLO eye tracking)
Projection artefact removal	Yes	Yes	Under development	Yes	Yes
Optic nerve OCTA	Yes	Yes	Yes	Yes	Yes
Anterior segment OCTA function	Prototype	Under development	No	No	Yes
Quantitative analysis	Yes	Yes	Under development	Yes (prototype)	Yes
Comparative follow-up function	Yes	Yes	Yes	Yes	No