A comparison is made between pulse echo response profiles obtained in water and profiles obtained in a tissue‐mimicking (TM) material for clinical ultrasound transducers. The TM material is assumed to provide a more accurate indication of actual beam profiles in soft tissue because of the presence of frequency‐dependent attenuation in the material. Pulse echo response profiles measured in the TM medium demonstrate a reduction in the focal distance and degraded resolution distal to the focal distance, in comparison to profiles obtained in water.
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Zagzebski et al. (1982) studied this question.
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