Acoustic Field of a Medical Ultrasound Probe Operated in Continuous-Wave Mode Investigated by TV Holography.
Acoustic Field of a Medical Ultrasound Probe Operated in Continuous-Wave Mode Investigated by TV Holography.
复制标题
通过电视全息术研究连续波模式下操作的医用超声探头的声场。
作者：
R. Rustad
时间平均电视全息术已被证明是研究透明介质中声场的一种有用的技术。本文叙述了时间平均电视全息法测量水中超声场的原理。提出了一个3.25 MHz的超声场的相位和振幅的投影从一个环形超声探头在CW模式下操作。定量测量的空间分辨率优于100妈妈已经获得。一组这样的投影可以通过层析成像技术被处理成声场的相位和振幅的三维映射。描述了这个过程，并给出了同一超声场的层析重建的一个例子。
Time-averaged TV holography has been shown to be a useful technique for investigating acoustic fields in transparent media. The theory of time-averaged TV-holography measurements of ultrasonic fields in water is described. Projections of the phase and the amplitude of a 3.25-MHz ultrasonic field from an annular ultrasound probe operated in cw mode are presented. Quantitative measurements with a spatial resolution of better than 100 mum have been obtained. A set of such projections may be processed into a three-dimensional mapping of the phase and the amplitude of the acoustic field by tomographic techniques. This process is described, and an example of a tomographic reconstruction of the same ultrasonic field is presented.