IRR-Net: A Joint Learning Framework for Image Reconstruction and Recognition of Photoacoustic Tomography

Table 1

Characteristic parameters of different tissue types in numerical phantoms.

Tissue name	Refractive index	Reflectance	µa (cm^‒1)	µs (cm^‒1)	Anisotropy factor	Sound speed (m/s)	Mass density (kg/L)	Radial thickness (mm)
Outer wall (OW)	1.42	0.08	0.70	6	0.85	1,600	1.026	0–0.5
Inner wall (IW)	1.42	0.05	0.40	6	0.85	1,580	1.073	0.1–0.4
Fibrous cap (FC)	1.47	0.24	0.78	25	0.78	1,610	1.058	0.2–0.5
Calcification (Cal)	1.47	0.34	0.83	560	0.78	1,540	1.668	0.3–0.5
Lipid pool (LP)	1.47	0.42	0.90	520	0.82	1,650	0.947	0.1–0.3
Mixed calcification (MC)	1.47	0.23	0.96	550	0.80	1,650	0.947	0.01–0.3
Cavity	1.35	0.12	0	610	0.99	1.540	1.065	1.2–1.7