An instrument has been developed to measure the acoustic pressure field during an obstetric ultrasound examination. This permits a more accurate assessment of possible bioeffects since the pressure is sensed at or near the site of the organs under investigation. The ultrasonic field is sampled using a calibrated seven-element linear array hydrophone of PVDF transducers, which is placed as close as possible to the ovary, embryo, or fetus, using a vaginal approach. The RF signals from the hydrophone are digitized at 50 Ms/s, and the maximum amplitude waveform received in the examination is recorded. The output of the clinical B-scanner is calibrated by the hydrophone in a water bath. From the hydrophone measurements, the in-vivo I/sub SPTA/, I/sub SPTP/, and I/sub SPPA/ can be computed. Further analysis allows the frequency-dependent tissue attenuation to be assessed.
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机译：已经开发了一种在产科超声检查过程中测量声压场的仪器。由于可以在被调查器官的部位或附近感觉到压力，因此可以对可能的生物效应进行更准确的评估。超声场是使用经校准的PVDF换能器的七元素线性阵列水听器采样的，使用阴道方法将其尽可能靠近卵巢，胚胎或胎儿放置。来自水听器的RF信号以50 Ms / s的速度数字化，并记录了检查中接收到的最大振幅波形。临床B扫描仪的输出在水浴中由水听器校准。根据水听器的测量结果，可以计算出体内I / sub SPTA /，I / sub SPTP /和I / sub SPPA /。进一步的分析可以评估频率相关的组织衰减。
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