【摘要】 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。更多还原

【Abstract】 The directivity function is used to describe the sound field of single-frequency and broad-band waves produced by a medical linear array. A method is developed with electronic focusing, amplitude weighting and aperture apodization to improve the beam patterns. In this paper, calculation of the sound field of broad-band waves, which are used more frequently in practice, is emphasized. The results show that the longer the broad-band wave lasts, the more the sound field is similar to that of the single-frequency wave.更多还原