One of the most promising emerging techniques for in vivo medical diagnostics is a Photoacoustic Tomography (PAT). This type of tomography is a non-ionizing and a non-invasive imaging modality, based on the effect in which light is converted into ultrasound waves. Photoacoustic (PA) signal is highly sensitive to absorption characteristics of the sample and pulsed laser light is required for illumination of the examined tissue or organ. Absorption of focused light by a sample leads to transient variations in temperature at the area of irradiation, resulting in the generation of acoustic signals that could be measured and converted into a three-dimensional image of this area.