Laser photoacoustics (PA) and optical coherence tomography (OCT) are versatile and sensitive techniques for
biomedical diagnostics, imaging, and measurements. In this paper, the fundamentals of PA and OCT are considered and
the applications in biomedicine reviewed. The properties of the two techniques are compared to find the proper technique
for a specific application. The problems and restrictions, dependent on the factors of the human body, which have to be
reduced before the clinical utilization of the techniques, are pointed out. The PA technique is more suitable for measuring
or imaging the objects located in deep tissue or organs and for sensing the physiological changes caused by compositions
with larger absorption variation, such as hemoglobin, blood oxygenation, and melanin. OCT is more suitable for imaging
tissue surface and subsurface structures and fine structures and for sensing the physiological changes caused by
compositions with larger scattering and refractive index variation, such as skin water, tissue glucose, and sweat.
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