Fig. 1.

Schematic diagram of the proposed FD optoacoustic tomography technique; the tissue is illuminated at one or several locations simultaneously, using an amplitude-modulated CW laser with a group of distinct frequencies ω. The absorbing object located at r₀ emits acoustic waves which are detected by the transducer at r_d. The detected acoustic signal is then converted to phase and amplitude information using narrowband detection/homodyne detection. The gray dots denote the voxel points used to discretize the sample for the forward modeling.