Fig. 2
From: Functional photoacoustic imaging: from nano- and micro- to macro-scale
Principle of fPAI. a Molecular imaging using multiple light wavelengths to assess the characteristic photophysical PA spectra of biological chromophores. b Flowmetry and vessel morphology analyzed from time sequence image frames acquired at a high image frame rate. fPAI, functional photoacoustic imaging; λ, wavelength; NIR, near-infrared; HbO2, oxygenated hemoglobin; HbR, reduced hemoglobin; SO2, oxygen saturation; t, time; (vx, vy, vz), velocity constituents for the x, y, and z axes, respectively