Abstract
Theoretical tissue temperature increases due to focused diagnostic ultrasound fields are evaluated for both homogeneous and three-layer tissue models. Applying the monopole-source solution, the general acoustic pressure field distribution is obtained for a specific source temporal average power. The axial steady-state temperature increase is calculated by applying the point-source solution of the bio-heat transfer equation to the pressure field distribution. Homogeneous and three-layer fetal tissue model examples for 3 MHz for circular source apertures are presented and compared to the thermal index of the recently approved Standard for Real-Time Display of Thermal and Mechanical Acoustic Output Indices on Diagnostic Ultrasound Equipment. >
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