<unk>  or optoacoustic imaging is a biomedical imaging modality based on the<unk>  effect. Non-ionizing laser pulses are delivered into biological tissues and part of the energy will be absorbed and converted into heat, leading to transient thermoelastic expansion and thus wideband (i.e. MHz) ultrasonic emission. The generated ultrasonic waves are detected by ultrasonic transducers and then analyzed to produce images. It is known that optical absorption is closely associated with physiological properties, such as hemoglobin concentration and oxygen saturation. As a result, the magnitude of the ultrasonic emission (i.e.<unk>  signal), which is proportional to the local energy deposition, reveals physiologically specific optical absorption contrast. 2D or 3D images of the targeted areas can then be formed.
Photoacoustic imaging
Vibroacoustic stimulation
Multispectral optoacoustic tomography
Thermoacoustic imaging
Doppler optical coherence tomography
Pure-tone audiometry
Tympanometry
Otoacoustic emission