Mis paper, medical uses of ultrasound, recent developments on nonlinear propagation of u/trasonic waves in biological mediums were briefly investigated. Tissue damaging effects of nonlinear propagation of u/trasonic waves were discussed underlying the heating effect of the high intensity u/trasound. Problems related to the u/trasonic cavitation and streaming were investigated. Effects of nonlinear propagation on the u/trasonic image qua/ity, basic physica/ prob/ems re/ated to the ca/ibration of the u/trasonic medical equipments and their physical bases were also discussed.
Key words: Ultrasonics, image guality, physical bases.
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