Table 2.

Comparison between major existing breast photoacoustic tomography (PAT) systems.

	PAM-02	Twente PAM 2	OptoSonics	LOUISA-3D	SBH-PACT	Imagio
Transducer/ Detector Geometry	2D Matrix Array	Hemisphere	Spherical	Arc	Ring	Linear Array
Receiver number	600 (20 × 30)	384	512	96	512	128
Central frequency	2 MHz	1 MHz	2 MHz	50 kHz—6 MHz frequency range	2.25 MHz	0.1–12 MHz frequency range
Bandwidth	130%	100%	70%	N/A	95%	N/A
Illumination Geometry	Rectangles Behind and in-front of PA detector	9 fiber bundles	Cone beam	Arc	Donut	Two Rectangular Windows
Laser Wavelengths	700–900 nm	755 and 1064 nm	750–800 nm	757, 797 nm	750, 1064 nm	757, 1064 nm
Resolution	1 mm	1.06 mm (lateral) 0.96 mm (elevational)	0.42 mm	−0.3 mm	0.255 mm	0.73–0.81 mm (lateral) 0.42–0.47 mm (axial)
Volumetric Imaging	Yes, via rotation	Yes	Yes	Yes, via rotation	Yes, via linear scanning	No
Breast Compression	Yes	No	No	No	Yes	No
Co-registered with US	Yes	No	No	Yes	No	Yes
FDA Status	N/A	N/A	N/A	N/A	N/A	Approved