A mobile assembly of electrically-powered devices intended for imaging and analysis of soft-tissue and soft-tissue vasculature using combined optoacoustic (photoacoustic) and ultrasound (US) imaging. It includes a processing unit with a monitor, controls, and integrated software, and a dedicated laser-emitting extracorporeal ultrasound transducer. Pulsed near-infrared laser light of various wavelengths is emitted and the associated acoustic feedback (photoacoustic effect) provides complementary information regarding tissue composition/functionality based on the presence of endogenous chromophores, such as haemoglobin; this photoacoustic data can be overlaid on the associated US image.