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用指向性函数分别描述了医用线列阵单频波和宽带波声场。讨论了应用电子聚焦处理、幅度加权变迹处理和孔径变迹处理的方法来改善波束特性;论述了在实际中应用较多的宽带波声场的计算。通过分析表明,宽带波持续时间愈长,宽带波声场就愈接近于单频波声场。
The directivity functions are used to describe the medical linear array single-frequency wave and broadband wave sound field respectively. The application of electronic focusing processing, amplitude-weighted apodization processing and aperture apodization processing are discussed to improve the beam characteristics. The calculation of wide-band acoustic fields which are widely used in practice is discussed. The analysis shows that the longer the duration of the broadband wave, the closer the broadband wave sound field is to the single-frequency wave sound field.